diff --git a/samples/client/petstore/swift5/alamofireLibrary/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift b/samples/client/petstore/swift5/alamofireLibrary/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift
index c34ac85ac63f..dd47346c7f85 100644
--- a/samples/client/petstore/swift5/alamofireLibrary/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift
+++ b/samples/client/petstore/swift5/alamofireLibrary/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift
@@ -12,7 +12,7 @@ public struct Animal: Codable {
     public var className: String
     public var color: String? = "red"
 
-    public init(className: String, color: String? = nil) {
+    public init(className: String, color: String? = "red") {
         self.className = className
         self.color = color
     }
diff --git a/samples/client/petstore/swift5/alamofireLibrary/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift b/samples/client/petstore/swift5/alamofireLibrary/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift
index 884020d1a72c..dd3ec9e51da8 100644
--- a/samples/client/petstore/swift5/alamofireLibrary/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift
+++ b/samples/client/petstore/swift5/alamofireLibrary/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift
@@ -13,7 +13,7 @@ public struct Cat: Codable {
     public var color: String? = "red"
     public var declawed: Bool?
 
-    public init(className: String, color: String? = nil, declawed: Bool? = nil) {
+    public init(className: String, color: String? = "red", declawed: Bool? = nil) {
         self.className = className
         self.color = color
         self.declawed = declawed
diff --git a/samples/client/petstore/swift5/alamofireLibrary/PetstoreClient/Classes/OpenAPIs/Models/Category.swift b/samples/client/petstore/swift5/alamofireLibrary/PetstoreClient/Classes/OpenAPIs/Models/Category.swift
index 78bf6826d690..faf66b272a41 100644
--- a/samples/client/petstore/swift5/alamofireLibrary/PetstoreClient/Classes/OpenAPIs/Models/Category.swift
+++ b/samples/client/petstore/swift5/alamofireLibrary/PetstoreClient/Classes/OpenAPIs/Models/Category.swift
@@ -12,7 +12,7 @@ public struct Category: Codable {
     public var id: Int64?
     public var name: String = "default-name"
 
-    public init(id: Int64? = nil, name: String) {
+    public init(id: Int64? = nil, name: String = "default-name") {
         self.id = id
         self.name = name
     }
diff --git a/samples/client/petstore/swift5/alamofireLibrary/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift b/samples/client/petstore/swift5/alamofireLibrary/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift
index e7e0efa931e8..38db861828c3 100644
--- a/samples/client/petstore/swift5/alamofireLibrary/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift
+++ b/samples/client/petstore/swift5/alamofireLibrary/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift
@@ -13,7 +13,7 @@ public struct Dog: Codable {
     public var color: String? = "red"
     public var breed: String?
 
-    public init(className: String, color: String? = nil, breed: String? = nil) {
+    public init(className: String, color: String? = "red", breed: String? = nil) {
         self.className = className
         self.color = color
         self.breed = breed
diff --git a/samples/client/petstore/swift5/alamofireLibrary/PetstoreClient/Classes/OpenAPIs/Models/Order.swift b/samples/client/petstore/swift5/alamofireLibrary/PetstoreClient/Classes/OpenAPIs/Models/Order.swift
index f1817f7792a1..58e5e78d7c28 100644
--- a/samples/client/petstore/swift5/alamofireLibrary/PetstoreClient/Classes/OpenAPIs/Models/Order.swift
+++ b/samples/client/petstore/swift5/alamofireLibrary/PetstoreClient/Classes/OpenAPIs/Models/Order.swift
@@ -22,7 +22,7 @@ public struct Order: Codable {
     public var status: Status?
     public var complete: Bool? = false
 
-    public init(id: Int64? = nil, petId: Int64? = nil, quantity: Int? = nil, shipDate: Date? = nil, status: Status? = nil, complete: Bool? = nil) {
+    public init(id: Int64? = nil, petId: Int64? = nil, quantity: Int? = nil, shipDate: Date? = nil, status: Status? = nil, complete: Bool? = false) {
         self.id = id
         self.petId = petId
         self.quantity = quantity
diff --git a/samples/client/petstore/swift5/alamofireLibrary/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift b/samples/client/petstore/swift5/alamofireLibrary/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift
index a9e088808ed3..a53e1589ff5a 100644
--- a/samples/client/petstore/swift5/alamofireLibrary/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift
+++ b/samples/client/petstore/swift5/alamofireLibrary/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift
@@ -15,7 +15,7 @@ public struct TypeHolderDefault: Codable {
     public var boolItem: Bool = true
     public var arrayItem: [Int]
 
-    public init(stringItem: String, numberItem: Double, integerItem: Int, boolItem: Bool, arrayItem: [Int]) {
+    public init(stringItem: String = "what", numberItem: Double, integerItem: Int, boolItem: Bool = true, arrayItem: [Int]) {
         self.stringItem = stringItem
         self.numberItem = numberItem
         self.integerItem = integerItem
diff --git a/samples/client/petstore/swift5/alamofireLibrary/SwaggerClientTests/SwaggerClientTests/StoreAPITests.swift b/samples/client/petstore/swift5/alamofireLibrary/SwaggerClientTests/SwaggerClientTests/StoreAPITests.swift
index c49f47eee00f..94cb489e5f25 100644
--- a/samples/client/petstore/swift5/alamofireLibrary/SwaggerClientTests/SwaggerClientTests/StoreAPITests.swift
+++ b/samples/client/petstore/swift5/alamofireLibrary/SwaggerClientTests/SwaggerClientTests/StoreAPITests.swift
@@ -88,7 +88,7 @@ class StoreAPITests: XCTestCase {
         let progressExpectation = self.expectation(description: "obtain progress")
         let requestBuilder = StoreAPI.getOrderByIdWithRequestBuilder(orderId: 1000)
 
-        requestBuilder.onProgressReady = { (progress) in
+        requestBuilder.onProgressReady = { (_) in
             progressExpectation.fulfill()
         }
 
diff --git a/samples/client/petstore/swift5/combineLibrary/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift b/samples/client/petstore/swift5/combineLibrary/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift
index c34ac85ac63f..dd47346c7f85 100644
--- a/samples/client/petstore/swift5/combineLibrary/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift
+++ b/samples/client/petstore/swift5/combineLibrary/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift
@@ -12,7 +12,7 @@ public struct Animal: Codable {
     public var className: String
     public var color: String? = "red"
 
-    public init(className: String, color: String? = nil) {
+    public init(className: String, color: String? = "red") {
         self.className = className
         self.color = color
     }
diff --git a/samples/client/petstore/swift5/combineLibrary/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift b/samples/client/petstore/swift5/combineLibrary/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift
index 884020d1a72c..dd3ec9e51da8 100644
--- a/samples/client/petstore/swift5/combineLibrary/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift
+++ b/samples/client/petstore/swift5/combineLibrary/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift
@@ -13,7 +13,7 @@ public struct Cat: Codable {
     public var color: String? = "red"
     public var declawed: Bool?
 
-    public init(className: String, color: String? = nil, declawed: Bool? = nil) {
+    public init(className: String, color: String? = "red", declawed: Bool? = nil) {
         self.className = className
         self.color = color
         self.declawed = declawed
diff --git a/samples/client/petstore/swift5/combineLibrary/PetstoreClient/Classes/OpenAPIs/Models/Category.swift b/samples/client/petstore/swift5/combineLibrary/PetstoreClient/Classes/OpenAPIs/Models/Category.swift
index 78bf6826d690..faf66b272a41 100644
--- a/samples/client/petstore/swift5/combineLibrary/PetstoreClient/Classes/OpenAPIs/Models/Category.swift
+++ b/samples/client/petstore/swift5/combineLibrary/PetstoreClient/Classes/OpenAPIs/Models/Category.swift
@@ -12,7 +12,7 @@ public struct Category: Codable {
     public var id: Int64?
     public var name: String = "default-name"
 
-    public init(id: Int64? = nil, name: String) {
+    public init(id: Int64? = nil, name: String = "default-name") {
         self.id = id
         self.name = name
     }
diff --git a/samples/client/petstore/swift5/combineLibrary/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift b/samples/client/petstore/swift5/combineLibrary/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift
index e7e0efa931e8..38db861828c3 100644
--- a/samples/client/petstore/swift5/combineLibrary/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift
+++ b/samples/client/petstore/swift5/combineLibrary/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift
@@ -13,7 +13,7 @@ public struct Dog: Codable {
     public var color: String? = "red"
     public var breed: String?
 
-    public init(className: String, color: String? = nil, breed: String? = nil) {
+    public init(className: String, color: String? = "red", breed: String? = nil) {
         self.className = className
         self.color = color
         self.breed = breed
diff --git a/samples/client/petstore/swift5/combineLibrary/PetstoreClient/Classes/OpenAPIs/Models/Order.swift b/samples/client/petstore/swift5/combineLibrary/PetstoreClient/Classes/OpenAPIs/Models/Order.swift
index f1817f7792a1..58e5e78d7c28 100644
--- a/samples/client/petstore/swift5/combineLibrary/PetstoreClient/Classes/OpenAPIs/Models/Order.swift
+++ b/samples/client/petstore/swift5/combineLibrary/PetstoreClient/Classes/OpenAPIs/Models/Order.swift
@@ -22,7 +22,7 @@ public struct Order: Codable {
     public var status: Status?
     public var complete: Bool? = false
 
-    public init(id: Int64? = nil, petId: Int64? = nil, quantity: Int? = nil, shipDate: Date? = nil, status: Status? = nil, complete: Bool? = nil) {
+    public init(id: Int64? = nil, petId: Int64? = nil, quantity: Int? = nil, shipDate: Date? = nil, status: Status? = nil, complete: Bool? = false) {
         self.id = id
         self.petId = petId
         self.quantity = quantity
diff --git a/samples/client/petstore/swift5/combineLibrary/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift b/samples/client/petstore/swift5/combineLibrary/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift
index a9e088808ed3..a53e1589ff5a 100644
--- a/samples/client/petstore/swift5/combineLibrary/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift
+++ b/samples/client/petstore/swift5/combineLibrary/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift
@@ -15,7 +15,7 @@ public struct TypeHolderDefault: Codable {
     public var boolItem: Bool = true
     public var arrayItem: [Int]
 
-    public init(stringItem: String, numberItem: Double, integerItem: Int, boolItem: Bool, arrayItem: [Int]) {
+    public init(stringItem: String = "what", numberItem: Double, integerItem: Int, boolItem: Bool = true, arrayItem: [Int]) {
         self.stringItem = stringItem
         self.numberItem = numberItem
         self.integerItem = integerItem
diff --git a/samples/client/petstore/swift5/default/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift b/samples/client/petstore/swift5/default/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift
index c34ac85ac63f..dd47346c7f85 100644
--- a/samples/client/petstore/swift5/default/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift
+++ b/samples/client/petstore/swift5/default/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift
@@ -12,7 +12,7 @@ public struct Animal: Codable {
     public var className: String
     public var color: String? = "red"
 
-    public init(className: String, color: String? = nil) {
+    public init(className: String, color: String? = "red") {
         self.className = className
         self.color = color
     }
diff --git a/samples/client/petstore/swift5/default/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift b/samples/client/petstore/swift5/default/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift
index 884020d1a72c..dd3ec9e51da8 100644
--- a/samples/client/petstore/swift5/default/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift
+++ b/samples/client/petstore/swift5/default/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift
@@ -13,7 +13,7 @@ public struct Cat: Codable {
     public var color: String? = "red"
     public var declawed: Bool?
 
-    public init(className: String, color: String? = nil, declawed: Bool? = nil) {
+    public init(className: String, color: String? = "red", declawed: Bool? = nil) {
         self.className = className
         self.color = color
         self.declawed = declawed
diff --git a/samples/client/petstore/swift5/default/PetstoreClient/Classes/OpenAPIs/Models/Category.swift b/samples/client/petstore/swift5/default/PetstoreClient/Classes/OpenAPIs/Models/Category.swift
index 78bf6826d690..faf66b272a41 100644
--- a/samples/client/petstore/swift5/default/PetstoreClient/Classes/OpenAPIs/Models/Category.swift
+++ b/samples/client/petstore/swift5/default/PetstoreClient/Classes/OpenAPIs/Models/Category.swift
@@ -12,7 +12,7 @@ public struct Category: Codable {
     public var id: Int64?
     public var name: String = "default-name"
 
-    public init(id: Int64? = nil, name: String) {
+    public init(id: Int64? = nil, name: String = "default-name") {
         self.id = id
         self.name = name
     }
diff --git a/samples/client/petstore/swift5/default/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift b/samples/client/petstore/swift5/default/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift
index e7e0efa931e8..38db861828c3 100644
--- a/samples/client/petstore/swift5/default/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift
+++ b/samples/client/petstore/swift5/default/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift
@@ -13,7 +13,7 @@ public struct Dog: Codable {
     public var color: String? = "red"
     public var breed: String?
 
-    public init(className: String, color: String? = nil, breed: String? = nil) {
+    public init(className: String, color: String? = "red", breed: String? = nil) {
         self.className = className
         self.color = color
         self.breed = breed
diff --git a/samples/client/petstore/swift5/default/PetstoreClient/Classes/OpenAPIs/Models/Order.swift b/samples/client/petstore/swift5/default/PetstoreClient/Classes/OpenAPIs/Models/Order.swift
index f1817f7792a1..58e5e78d7c28 100644
--- a/samples/client/petstore/swift5/default/PetstoreClient/Classes/OpenAPIs/Models/Order.swift
+++ b/samples/client/petstore/swift5/default/PetstoreClient/Classes/OpenAPIs/Models/Order.swift
@@ -22,7 +22,7 @@ public struct Order: Codable {
     public var status: Status?
     public var complete: Bool? = false
 
-    public init(id: Int64? = nil, petId: Int64? = nil, quantity: Int? = nil, shipDate: Date? = nil, status: Status? = nil, complete: Bool? = nil) {
+    public init(id: Int64? = nil, petId: Int64? = nil, quantity: Int? = nil, shipDate: Date? = nil, status: Status? = nil, complete: Bool? = false) {
         self.id = id
         self.petId = petId
         self.quantity = quantity
diff --git a/samples/client/petstore/swift5/default/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift b/samples/client/petstore/swift5/default/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift
index a9e088808ed3..a53e1589ff5a 100644
--- a/samples/client/petstore/swift5/default/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift
+++ b/samples/client/petstore/swift5/default/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift
@@ -15,7 +15,7 @@ public struct TypeHolderDefault: Codable {
     public var boolItem: Bool = true
     public var arrayItem: [Int]
 
-    public init(stringItem: String, numberItem: Double, integerItem: Int, boolItem: Bool, arrayItem: [Int]) {
+    public init(stringItem: String = "what", numberItem: Double, integerItem: Int, boolItem: Bool = true, arrayItem: [Int]) {
         self.stringItem = stringItem
         self.numberItem = numberItem
         self.integerItem = integerItem
diff --git a/samples/client/petstore/swift5/default/SwaggerClientTests/SwaggerClientTests/StoreAPITests.swift b/samples/client/petstore/swift5/default/SwaggerClientTests/SwaggerClientTests/StoreAPITests.swift
index c49f47eee00f..94cb489e5f25 100644
--- a/samples/client/petstore/swift5/default/SwaggerClientTests/SwaggerClientTests/StoreAPITests.swift
+++ b/samples/client/petstore/swift5/default/SwaggerClientTests/SwaggerClientTests/StoreAPITests.swift
@@ -88,7 +88,7 @@ class StoreAPITests: XCTestCase {
         let progressExpectation = self.expectation(description: "obtain progress")
         let requestBuilder = StoreAPI.getOrderByIdWithRequestBuilder(orderId: 1000)
 
-        requestBuilder.onProgressReady = { (progress) in
+        requestBuilder.onProgressReady = { (_) in
             progressExpectation.fulfill()
         }
 
diff --git a/samples/client/petstore/swift5/deprecated/PetstoreClient/Classes/OpenAPIs/Models/Order.swift b/samples/client/petstore/swift5/deprecated/PetstoreClient/Classes/OpenAPIs/Models/Order.swift
index f3d9fcb15fb0..b4c68489ba87 100644
--- a/samples/client/petstore/swift5/deprecated/PetstoreClient/Classes/OpenAPIs/Models/Order.swift
+++ b/samples/client/petstore/swift5/deprecated/PetstoreClient/Classes/OpenAPIs/Models/Order.swift
@@ -24,7 +24,7 @@ public struct Order: Codable {
     public var status: Status?
     public var complete: Bool? = false
 
-    public init(id: Int64? = nil, petId: Int64? = nil, quantity: Int? = nil, shipDate: Date? = nil, status: Status? = nil, complete: Bool? = nil) {
+    public init(id: Int64? = nil, petId: Int64? = nil, quantity: Int? = nil, shipDate: Date? = nil, status: Status? = nil, complete: Bool? = false) {
         self.id = id
         self.petId = petId
         self.quantity = quantity
diff --git a/samples/client/petstore/swift5/nonPublicApi/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift b/samples/client/petstore/swift5/nonPublicApi/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift
index 1bafc8ada6f3..58d18c3de919 100644
--- a/samples/client/petstore/swift5/nonPublicApi/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift
+++ b/samples/client/petstore/swift5/nonPublicApi/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift
@@ -12,7 +12,7 @@ internal struct Animal: Codable {
     internal var className: String
     internal var color: String? = "red"
 
-    internal init(className: String, color: String? = nil) {
+    internal init(className: String, color: String? = "red") {
         self.className = className
         self.color = color
     }
diff --git a/samples/client/petstore/swift5/nonPublicApi/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift b/samples/client/petstore/swift5/nonPublicApi/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift
index 0959d1301da7..8dc7f0e239d6 100644
--- a/samples/client/petstore/swift5/nonPublicApi/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift
+++ b/samples/client/petstore/swift5/nonPublicApi/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift
@@ -13,7 +13,7 @@ internal struct Cat: Codable {
     internal var color: String? = "red"
     internal var declawed: Bool?
 
-    internal init(className: String, color: String? = nil, declawed: Bool? = nil) {
+    internal init(className: String, color: String? = "red", declawed: Bool? = nil) {
         self.className = className
         self.color = color
         self.declawed = declawed
diff --git a/samples/client/petstore/swift5/nonPublicApi/PetstoreClient/Classes/OpenAPIs/Models/Category.swift b/samples/client/petstore/swift5/nonPublicApi/PetstoreClient/Classes/OpenAPIs/Models/Category.swift
index 5910c7e82cef..81fd6dcc6e83 100644
--- a/samples/client/petstore/swift5/nonPublicApi/PetstoreClient/Classes/OpenAPIs/Models/Category.swift
+++ b/samples/client/petstore/swift5/nonPublicApi/PetstoreClient/Classes/OpenAPIs/Models/Category.swift
@@ -12,7 +12,7 @@ internal struct Category: Codable {
     internal var id: Int64?
     internal var name: String = "default-name"
 
-    internal init(id: Int64? = nil, name: String) {
+    internal init(id: Int64? = nil, name: String = "default-name") {
         self.id = id
         self.name = name
     }
diff --git a/samples/client/petstore/swift5/nonPublicApi/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift b/samples/client/petstore/swift5/nonPublicApi/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift
index 2af5a26ba541..8ff18c70b644 100644
--- a/samples/client/petstore/swift5/nonPublicApi/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift
+++ b/samples/client/petstore/swift5/nonPublicApi/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift
@@ -13,7 +13,7 @@ internal struct Dog: Codable {
     internal var color: String? = "red"
     internal var breed: String?
 
-    internal init(className: String, color: String? = nil, breed: String? = nil) {
+    internal init(className: String, color: String? = "red", breed: String? = nil) {
         self.className = className
         self.color = color
         self.breed = breed
diff --git a/samples/client/petstore/swift5/nonPublicApi/PetstoreClient/Classes/OpenAPIs/Models/Order.swift b/samples/client/petstore/swift5/nonPublicApi/PetstoreClient/Classes/OpenAPIs/Models/Order.swift
index e29eae4ef78f..5317c8ffed6e 100644
--- a/samples/client/petstore/swift5/nonPublicApi/PetstoreClient/Classes/OpenAPIs/Models/Order.swift
+++ b/samples/client/petstore/swift5/nonPublicApi/PetstoreClient/Classes/OpenAPIs/Models/Order.swift
@@ -22,7 +22,7 @@ internal struct Order: Codable {
     internal var status: Status?
     internal var complete: Bool? = false
 
-    internal init(id: Int64? = nil, petId: Int64? = nil, quantity: Int? = nil, shipDate: Date? = nil, status: Status? = nil, complete: Bool? = nil) {
+    internal init(id: Int64? = nil, petId: Int64? = nil, quantity: Int? = nil, shipDate: Date? = nil, status: Status? = nil, complete: Bool? = false) {
         self.id = id
         self.petId = petId
         self.quantity = quantity
diff --git a/samples/client/petstore/swift5/nonPublicApi/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift b/samples/client/petstore/swift5/nonPublicApi/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift
index 83908bb4fc94..7637e2d57254 100644
--- a/samples/client/petstore/swift5/nonPublicApi/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift
+++ b/samples/client/petstore/swift5/nonPublicApi/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift
@@ -15,7 +15,7 @@ internal struct TypeHolderDefault: Codable {
     internal var boolItem: Bool = true
     internal var arrayItem: [Int]
 
-    internal init(stringItem: String, numberItem: Double, integerItem: Int, boolItem: Bool, arrayItem: [Int]) {
+    internal init(stringItem: String = "what", numberItem: Double, integerItem: Int, boolItem: Bool = true, arrayItem: [Int]) {
         self.stringItem = stringItem
         self.numberItem = numberItem
         self.integerItem = integerItem
diff --git a/samples/client/petstore/swift5/objcCompatible/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift b/samples/client/petstore/swift5/objcCompatible/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift
index e870a6023c6e..528d7f886c0b 100644
--- a/samples/client/petstore/swift5/objcCompatible/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift
+++ b/samples/client/petstore/swift5/objcCompatible/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift
@@ -12,7 +12,7 @@ import Foundation
     public var _className: String
     public var color: String? = "red"
 
-    public init(_className: String, color: String? = nil) {
+    public init(_className: String, color: String? = "red") {
         self._className = _className
         self.color = color
     }
diff --git a/samples/client/petstore/swift5/objcCompatible/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift b/samples/client/petstore/swift5/objcCompatible/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift
index 4368187bfba7..5542ffa7de75 100644
--- a/samples/client/petstore/swift5/objcCompatible/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift
+++ b/samples/client/petstore/swift5/objcCompatible/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift
@@ -18,7 +18,7 @@ import Foundation
         }
     }
 
-    public init(_className: String, color: String? = nil, declawed: Bool? = nil) {
+    public init(_className: String, color: String? = "red", declawed: Bool? = nil) {
         self._className = _className
         self.color = color
         self.declawed = declawed
diff --git a/samples/client/petstore/swift5/objcCompatible/PetstoreClient/Classes/OpenAPIs/Models/Category.swift b/samples/client/petstore/swift5/objcCompatible/PetstoreClient/Classes/OpenAPIs/Models/Category.swift
index b5b8b86b56b1..0e034abbf725 100644
--- a/samples/client/petstore/swift5/objcCompatible/PetstoreClient/Classes/OpenAPIs/Models/Category.swift
+++ b/samples/client/petstore/swift5/objcCompatible/PetstoreClient/Classes/OpenAPIs/Models/Category.swift
@@ -17,7 +17,7 @@ import Foundation
     }
     public var name: String = "default-name"
 
-    public init(_id: Int64? = nil, name: String) {
+    public init(_id: Int64? = nil, name: String = "default-name") {
         self._id = _id
         self.name = name
     }
diff --git a/samples/client/petstore/swift5/objcCompatible/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift b/samples/client/petstore/swift5/objcCompatible/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift
index a55d537695d9..be6118ef423f 100644
--- a/samples/client/petstore/swift5/objcCompatible/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift
+++ b/samples/client/petstore/swift5/objcCompatible/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift
@@ -13,7 +13,7 @@ import Foundation
     public var color: String? = "red"
     public var breed: String?
 
-    public init(_className: String, color: String? = nil, breed: String? = nil) {
+    public init(_className: String, color: String? = "red", breed: String? = nil) {
         self._className = _className
         self.color = color
         self.breed = breed
diff --git a/samples/client/petstore/swift5/objcCompatible/PetstoreClient/Classes/OpenAPIs/Models/Order.swift b/samples/client/petstore/swift5/objcCompatible/PetstoreClient/Classes/OpenAPIs/Models/Order.swift
index 1281a50c1dc2..728a81434a73 100644
--- a/samples/client/petstore/swift5/objcCompatible/PetstoreClient/Classes/OpenAPIs/Models/Order.swift
+++ b/samples/client/petstore/swift5/objcCompatible/PetstoreClient/Classes/OpenAPIs/Models/Order.swift
@@ -42,7 +42,7 @@ import Foundation
         }
     }
 
-    public init(_id: Int64? = nil, petId: Int64? = nil, quantity: Int? = nil, shipDate: Date? = nil, status: Status? = nil, complete: Bool? = nil) {
+    public init(_id: Int64? = nil, petId: Int64? = nil, quantity: Int? = nil, shipDate: Date? = nil, status: Status? = nil, complete: Bool? = false) {
         self._id = _id
         self.petId = petId
         self.quantity = quantity
diff --git a/samples/client/petstore/swift5/objcCompatible/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift b/samples/client/petstore/swift5/objcCompatible/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift
index 6d51f44540c0..5900ded6aad4 100644
--- a/samples/client/petstore/swift5/objcCompatible/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift
+++ b/samples/client/petstore/swift5/objcCompatible/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift
@@ -15,7 +15,7 @@ import Foundation
     public var boolItem: Bool = true
     public var arrayItem: [Int]
 
-    public init(stringItem: String, numberItem: Double, integerItem: Int, boolItem: Bool, arrayItem: [Int]) {
+    public init(stringItem: String = "what", numberItem: Double, integerItem: Int, boolItem: Bool = true, arrayItem: [Int]) {
         self.stringItem = stringItem
         self.numberItem = numberItem
         self.integerItem = integerItem
diff --git a/samples/client/petstore/swift5/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift b/samples/client/petstore/swift5/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift
index c34ac85ac63f..dd47346c7f85 100644
--- a/samples/client/petstore/swift5/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift
+++ b/samples/client/petstore/swift5/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift
@@ -12,7 +12,7 @@ public struct Animal: Codable {
     public var className: String
     public var color: String? = "red"
 
-    public init(className: String, color: String? = nil) {
+    public init(className: String, color: String? = "red") {
         self.className = className
         self.color = color
     }
diff --git a/samples/client/petstore/swift5/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift b/samples/client/petstore/swift5/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift
index 884020d1a72c..dd3ec9e51da8 100644
--- a/samples/client/petstore/swift5/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift
+++ b/samples/client/petstore/swift5/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift
@@ -13,7 +13,7 @@ public struct Cat: Codable {
     public var color: String? = "red"
     public var declawed: Bool?
 
-    public init(className: String, color: String? = nil, declawed: Bool? = nil) {
+    public init(className: String, color: String? = "red", declawed: Bool? = nil) {
         self.className = className
         self.color = color
         self.declawed = declawed
diff --git a/samples/client/petstore/swift5/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/Models/Category.swift b/samples/client/petstore/swift5/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/Models/Category.swift
index 78bf6826d690..faf66b272a41 100644
--- a/samples/client/petstore/swift5/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/Models/Category.swift
+++ b/samples/client/petstore/swift5/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/Models/Category.swift
@@ -12,7 +12,7 @@ public struct Category: Codable {
     public var id: Int64?
     public var name: String = "default-name"
 
-    public init(id: Int64? = nil, name: String) {
+    public init(id: Int64? = nil, name: String = "default-name") {
         self.id = id
         self.name = name
     }
diff --git a/samples/client/petstore/swift5/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift b/samples/client/petstore/swift5/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift
index e7e0efa931e8..38db861828c3 100644
--- a/samples/client/petstore/swift5/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift
+++ b/samples/client/petstore/swift5/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift
@@ -13,7 +13,7 @@ public struct Dog: Codable {
     public var color: String? = "red"
     public var breed: String?
 
-    public init(className: String, color: String? = nil, breed: String? = nil) {
+    public init(className: String, color: String? = "red", breed: String? = nil) {
         self.className = className
         self.color = color
         self.breed = breed
diff --git a/samples/client/petstore/swift5/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/Models/Order.swift b/samples/client/petstore/swift5/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/Models/Order.swift
index f1817f7792a1..58e5e78d7c28 100644
--- a/samples/client/petstore/swift5/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/Models/Order.swift
+++ b/samples/client/petstore/swift5/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/Models/Order.swift
@@ -22,7 +22,7 @@ public struct Order: Codable {
     public var status: Status?
     public var complete: Bool? = false
 
-    public init(id: Int64? = nil, petId: Int64? = nil, quantity: Int? = nil, shipDate: Date? = nil, status: Status? = nil, complete: Bool? = nil) {
+    public init(id: Int64? = nil, petId: Int64? = nil, quantity: Int? = nil, shipDate: Date? = nil, status: Status? = nil, complete: Bool? = false) {
         self.id = id
         self.petId = petId
         self.quantity = quantity
diff --git a/samples/client/petstore/swift5/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift b/samples/client/petstore/swift5/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift
index a9e088808ed3..a53e1589ff5a 100644
--- a/samples/client/petstore/swift5/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift
+++ b/samples/client/petstore/swift5/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift
@@ -15,7 +15,7 @@ public struct TypeHolderDefault: Codable {
     public var boolItem: Bool = true
     public var arrayItem: [Int]
 
-    public init(stringItem: String, numberItem: Double, integerItem: Int, boolItem: Bool, arrayItem: [Int]) {
+    public init(stringItem: String = "what", numberItem: Double, integerItem: Int, boolItem: Bool = true, arrayItem: [Int]) {
         self.stringItem = stringItem
         self.numberItem = numberItem
         self.integerItem = integerItem
diff --git a/samples/client/petstore/swift5/readonlyProperties/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift b/samples/client/petstore/swift5/readonlyProperties/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift
index 7daa5138de00..d8f5071e3ced 100644
--- a/samples/client/petstore/swift5/readonlyProperties/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift
+++ b/samples/client/petstore/swift5/readonlyProperties/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift
@@ -12,7 +12,7 @@ public struct Animal: Codable {
     public private(set) var className: String
     public private(set) var color: String? = "red"
 
-    public init(className: String, color: String? = nil) {
+    public init(className: String, color: String? = "red") {
         self.className = className
         self.color = color
     }
diff --git a/samples/client/petstore/swift5/readonlyProperties/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift b/samples/client/petstore/swift5/readonlyProperties/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift
index 44de9d88fe36..a1cecc42b6ff 100644
--- a/samples/client/petstore/swift5/readonlyProperties/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift
+++ b/samples/client/petstore/swift5/readonlyProperties/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift
@@ -13,7 +13,7 @@ public struct Cat: Codable {
     public private(set) var color: String? = "red"
     public private(set) var declawed: Bool?
 
-    public init(className: String, color: String? = nil, declawed: Bool? = nil) {
+    public init(className: String, color: String? = "red", declawed: Bool? = nil) {
         self.className = className
         self.color = color
         self.declawed = declawed
diff --git a/samples/client/petstore/swift5/readonlyProperties/PetstoreClient/Classes/OpenAPIs/Models/Category.swift b/samples/client/petstore/swift5/readonlyProperties/PetstoreClient/Classes/OpenAPIs/Models/Category.swift
index 5b2ec18905fc..e00b87b4acc0 100644
--- a/samples/client/petstore/swift5/readonlyProperties/PetstoreClient/Classes/OpenAPIs/Models/Category.swift
+++ b/samples/client/petstore/swift5/readonlyProperties/PetstoreClient/Classes/OpenAPIs/Models/Category.swift
@@ -12,7 +12,7 @@ public struct Category: Codable {
     public private(set) var id: Int64?
     public private(set) var name: String = "default-name"
 
-    public init(id: Int64? = nil, name: String) {
+    public init(id: Int64? = nil, name: String = "default-name") {
         self.id = id
         self.name = name
     }
diff --git a/samples/client/petstore/swift5/readonlyProperties/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift b/samples/client/petstore/swift5/readonlyProperties/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift
index 1e660e05bd27..142684decd13 100644
--- a/samples/client/petstore/swift5/readonlyProperties/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift
+++ b/samples/client/petstore/swift5/readonlyProperties/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift
@@ -13,7 +13,7 @@ public struct Dog: Codable {
     public private(set) var color: String? = "red"
     public private(set) var breed: String?
 
-    public init(className: String, color: String? = nil, breed: String? = nil) {
+    public init(className: String, color: String? = "red", breed: String? = nil) {
         self.className = className
         self.color = color
         self.breed = breed
diff --git a/samples/client/petstore/swift5/readonlyProperties/PetstoreClient/Classes/OpenAPIs/Models/Order.swift b/samples/client/petstore/swift5/readonlyProperties/PetstoreClient/Classes/OpenAPIs/Models/Order.swift
index 966cc61ac873..2c2900750065 100644
--- a/samples/client/petstore/swift5/readonlyProperties/PetstoreClient/Classes/OpenAPIs/Models/Order.swift
+++ b/samples/client/petstore/swift5/readonlyProperties/PetstoreClient/Classes/OpenAPIs/Models/Order.swift
@@ -22,7 +22,7 @@ public struct Order: Codable {
     public private(set) var status: Status?
     public private(set) var complete: Bool? = false
 
-    public init(id: Int64? = nil, petId: Int64? = nil, quantity: Int? = nil, shipDate: Date? = nil, status: Status? = nil, complete: Bool? = nil) {
+    public init(id: Int64? = nil, petId: Int64? = nil, quantity: Int? = nil, shipDate: Date? = nil, status: Status? = nil, complete: Bool? = false) {
         self.id = id
         self.petId = petId
         self.quantity = quantity
diff --git a/samples/client/petstore/swift5/readonlyProperties/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift b/samples/client/petstore/swift5/readonlyProperties/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift
index ed3641fdb2fc..b3dbc65f8d93 100644
--- a/samples/client/petstore/swift5/readonlyProperties/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift
+++ b/samples/client/petstore/swift5/readonlyProperties/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift
@@ -15,7 +15,7 @@ public struct TypeHolderDefault: Codable {
     public private(set) var boolItem: Bool = true
     public private(set) var arrayItem: [Int]
 
-    public init(stringItem: String, numberItem: Double, integerItem: Int, boolItem: Bool, arrayItem: [Int]) {
+    public init(stringItem: String = "what", numberItem: Double, integerItem: Int, boolItem: Bool = true, arrayItem: [Int]) {
         self.stringItem = stringItem
         self.numberItem = numberItem
         self.integerItem = integerItem
diff --git a/samples/client/petstore/swift5/resultLibrary/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift b/samples/client/petstore/swift5/resultLibrary/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift
index c34ac85ac63f..dd47346c7f85 100644
--- a/samples/client/petstore/swift5/resultLibrary/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift
+++ b/samples/client/petstore/swift5/resultLibrary/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift
@@ -12,7 +12,7 @@ public struct Animal: Codable {
     public var className: String
     public var color: String? = "red"
 
-    public init(className: String, color: String? = nil) {
+    public init(className: String, color: String? = "red") {
         self.className = className
         self.color = color
     }
diff --git a/samples/client/petstore/swift5/resultLibrary/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift b/samples/client/petstore/swift5/resultLibrary/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift
index 884020d1a72c..dd3ec9e51da8 100644
--- a/samples/client/petstore/swift5/resultLibrary/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift
+++ b/samples/client/petstore/swift5/resultLibrary/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift
@@ -13,7 +13,7 @@ public struct Cat: Codable {
     public var color: String? = "red"
     public var declawed: Bool?
 
-    public init(className: String, color: String? = nil, declawed: Bool? = nil) {
+    public init(className: String, color: String? = "red", declawed: Bool? = nil) {
         self.className = className
         self.color = color
         self.declawed = declawed
diff --git a/samples/client/petstore/swift5/resultLibrary/PetstoreClient/Classes/OpenAPIs/Models/Category.swift b/samples/client/petstore/swift5/resultLibrary/PetstoreClient/Classes/OpenAPIs/Models/Category.swift
index 78bf6826d690..faf66b272a41 100644
--- a/samples/client/petstore/swift5/resultLibrary/PetstoreClient/Classes/OpenAPIs/Models/Category.swift
+++ b/samples/client/petstore/swift5/resultLibrary/PetstoreClient/Classes/OpenAPIs/Models/Category.swift
@@ -12,7 +12,7 @@ public struct Category: Codable {
     public var id: Int64?
     public var name: String = "default-name"
 
-    public init(id: Int64? = nil, name: String) {
+    public init(id: Int64? = nil, name: String = "default-name") {
         self.id = id
         self.name = name
     }
diff --git a/samples/client/petstore/swift5/resultLibrary/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift b/samples/client/petstore/swift5/resultLibrary/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift
index e7e0efa931e8..38db861828c3 100644
--- a/samples/client/petstore/swift5/resultLibrary/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift
+++ b/samples/client/petstore/swift5/resultLibrary/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift
@@ -13,7 +13,7 @@ public struct Dog: Codable {
     public var color: String? = "red"
     public var breed: String?
 
-    public init(className: String, color: String? = nil, breed: String? = nil) {
+    public init(className: String, color: String? = "red", breed: String? = nil) {
         self.className = className
         self.color = color
         self.breed = breed
diff --git a/samples/client/petstore/swift5/resultLibrary/PetstoreClient/Classes/OpenAPIs/Models/Order.swift b/samples/client/petstore/swift5/resultLibrary/PetstoreClient/Classes/OpenAPIs/Models/Order.swift
index f1817f7792a1..58e5e78d7c28 100644
--- a/samples/client/petstore/swift5/resultLibrary/PetstoreClient/Classes/OpenAPIs/Models/Order.swift
+++ b/samples/client/petstore/swift5/resultLibrary/PetstoreClient/Classes/OpenAPIs/Models/Order.swift
@@ -22,7 +22,7 @@ public struct Order: Codable {
     public var status: Status?
     public var complete: Bool? = false
 
-    public init(id: Int64? = nil, petId: Int64? = nil, quantity: Int? = nil, shipDate: Date? = nil, status: Status? = nil, complete: Bool? = nil) {
+    public init(id: Int64? = nil, petId: Int64? = nil, quantity: Int? = nil, shipDate: Date? = nil, status: Status? = nil, complete: Bool? = false) {
         self.id = id
         self.petId = petId
         self.quantity = quantity
diff --git a/samples/client/petstore/swift5/resultLibrary/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift b/samples/client/petstore/swift5/resultLibrary/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift
index a9e088808ed3..a53e1589ff5a 100644
--- a/samples/client/petstore/swift5/resultLibrary/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift
+++ b/samples/client/petstore/swift5/resultLibrary/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift
@@ -15,7 +15,7 @@ public struct TypeHolderDefault: Codable {
     public var boolItem: Bool = true
     public var arrayItem: [Int]
 
-    public init(stringItem: String, numberItem: Double, integerItem: Int, boolItem: Bool, arrayItem: [Int]) {
+    public init(stringItem: String = "what", numberItem: Double, integerItem: Int, boolItem: Bool = true, arrayItem: [Int]) {
         self.stringItem = stringItem
         self.numberItem = numberItem
         self.integerItem = integerItem
diff --git a/samples/client/petstore/swift5/rxswiftLibrary/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift b/samples/client/petstore/swift5/rxswiftLibrary/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift
index c34ac85ac63f..dd47346c7f85 100644
--- a/samples/client/petstore/swift5/rxswiftLibrary/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift
+++ b/samples/client/petstore/swift5/rxswiftLibrary/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift
@@ -12,7 +12,7 @@ public struct Animal: Codable {
     public var className: String
     public var color: String? = "red"
 
-    public init(className: String, color: String? = nil) {
+    public init(className: String, color: String? = "red") {
         self.className = className
         self.color = color
     }
diff --git a/samples/client/petstore/swift5/rxswiftLibrary/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift b/samples/client/petstore/swift5/rxswiftLibrary/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift
index 884020d1a72c..dd3ec9e51da8 100644
--- a/samples/client/petstore/swift5/rxswiftLibrary/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift
+++ b/samples/client/petstore/swift5/rxswiftLibrary/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift
@@ -13,7 +13,7 @@ public struct Cat: Codable {
     public var color: String? = "red"
     public var declawed: Bool?
 
-    public init(className: String, color: String? = nil, declawed: Bool? = nil) {
+    public init(className: String, color: String? = "red", declawed: Bool? = nil) {
         self.className = className
         self.color = color
         self.declawed = declawed
diff --git a/samples/client/petstore/swift5/rxswiftLibrary/PetstoreClient/Classes/OpenAPIs/Models/Category.swift b/samples/client/petstore/swift5/rxswiftLibrary/PetstoreClient/Classes/OpenAPIs/Models/Category.swift
index 78bf6826d690..faf66b272a41 100644
--- a/samples/client/petstore/swift5/rxswiftLibrary/PetstoreClient/Classes/OpenAPIs/Models/Category.swift
+++ b/samples/client/petstore/swift5/rxswiftLibrary/PetstoreClient/Classes/OpenAPIs/Models/Category.swift
@@ -12,7 +12,7 @@ public struct Category: Codable {
     public var id: Int64?
     public var name: String = "default-name"
 
-    public init(id: Int64? = nil, name: String) {
+    public init(id: Int64? = nil, name: String = "default-name") {
         self.id = id
         self.name = name
     }
diff --git a/samples/client/petstore/swift5/rxswiftLibrary/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift b/samples/client/petstore/swift5/rxswiftLibrary/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift
index e7e0efa931e8..38db861828c3 100644
--- a/samples/client/petstore/swift5/rxswiftLibrary/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift
+++ b/samples/client/petstore/swift5/rxswiftLibrary/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift
@@ -13,7 +13,7 @@ public struct Dog: Codable {
     public var color: String? = "red"
     public var breed: String?
 
-    public init(className: String, color: String? = nil, breed: String? = nil) {
+    public init(className: String, color: String? = "red", breed: String? = nil) {
         self.className = className
         self.color = color
         self.breed = breed
diff --git a/samples/client/petstore/swift5/rxswiftLibrary/PetstoreClient/Classes/OpenAPIs/Models/Order.swift b/samples/client/petstore/swift5/rxswiftLibrary/PetstoreClient/Classes/OpenAPIs/Models/Order.swift
index f1817f7792a1..58e5e78d7c28 100644
--- a/samples/client/petstore/swift5/rxswiftLibrary/PetstoreClient/Classes/OpenAPIs/Models/Order.swift
+++ b/samples/client/petstore/swift5/rxswiftLibrary/PetstoreClient/Classes/OpenAPIs/Models/Order.swift
@@ -22,7 +22,7 @@ public struct Order: Codable {
     public var status: Status?
     public var complete: Bool? = false
 
-    public init(id: Int64? = nil, petId: Int64? = nil, quantity: Int? = nil, shipDate: Date? = nil, status: Status? = nil, complete: Bool? = nil) {
+    public init(id: Int64? = nil, petId: Int64? = nil, quantity: Int? = nil, shipDate: Date? = nil, status: Status? = nil, complete: Bool? = false) {
         self.id = id
         self.petId = petId
         self.quantity = quantity
diff --git a/samples/client/petstore/swift5/rxswiftLibrary/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift b/samples/client/petstore/swift5/rxswiftLibrary/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift
index a9e088808ed3..a53e1589ff5a 100644
--- a/samples/client/petstore/swift5/rxswiftLibrary/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift
+++ b/samples/client/petstore/swift5/rxswiftLibrary/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift
@@ -15,7 +15,7 @@ public struct TypeHolderDefault: Codable {
     public var boolItem: Bool = true
     public var arrayItem: [Int]
 
-    public init(stringItem: String, numberItem: Double, integerItem: Int, boolItem: Bool, arrayItem: [Int]) {
+    public init(stringItem: String = "what", numberItem: Double, integerItem: Int, boolItem: Bool = true, arrayItem: [Int]) {
         self.stringItem = stringItem
         self.numberItem = numberItem
         self.integerItem = integerItem
diff --git a/samples/client/petstore/swift5/urlsessionLibrary/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift b/samples/client/petstore/swift5/urlsessionLibrary/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift
index c34ac85ac63f..dd47346c7f85 100644
--- a/samples/client/petstore/swift5/urlsessionLibrary/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift
+++ b/samples/client/petstore/swift5/urlsessionLibrary/PetstoreClient/Classes/OpenAPIs/Models/Animal.swift
@@ -12,7 +12,7 @@ public struct Animal: Codable {
     public var className: String
     public var color: String? = "red"
 
-    public init(className: String, color: String? = nil) {
+    public init(className: String, color: String? = "red") {
         self.className = className
         self.color = color
     }
diff --git a/samples/client/petstore/swift5/urlsessionLibrary/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift b/samples/client/petstore/swift5/urlsessionLibrary/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift
index 884020d1a72c..dd3ec9e51da8 100644
--- a/samples/client/petstore/swift5/urlsessionLibrary/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift
+++ b/samples/client/petstore/swift5/urlsessionLibrary/PetstoreClient/Classes/OpenAPIs/Models/Cat.swift
@@ -13,7 +13,7 @@ public struct Cat: Codable {
     public var color: String? = "red"
     public var declawed: Bool?
 
-    public init(className: String, color: String? = nil, declawed: Bool? = nil) {
+    public init(className: String, color: String? = "red", declawed: Bool? = nil) {
         self.className = className
         self.color = color
         self.declawed = declawed
diff --git a/samples/client/petstore/swift5/urlsessionLibrary/PetstoreClient/Classes/OpenAPIs/Models/Category.swift b/samples/client/petstore/swift5/urlsessionLibrary/PetstoreClient/Classes/OpenAPIs/Models/Category.swift
index 78bf6826d690..faf66b272a41 100644
--- a/samples/client/petstore/swift5/urlsessionLibrary/PetstoreClient/Classes/OpenAPIs/Models/Category.swift
+++ b/samples/client/petstore/swift5/urlsessionLibrary/PetstoreClient/Classes/OpenAPIs/Models/Category.swift
@@ -12,7 +12,7 @@ public struct Category: Codable {
     public var id: Int64?
     public var name: String = "default-name"
 
-    public init(id: Int64? = nil, name: String) {
+    public init(id: Int64? = nil, name: String = "default-name") {
         self.id = id
         self.name = name
     }
diff --git a/samples/client/petstore/swift5/urlsessionLibrary/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift b/samples/client/petstore/swift5/urlsessionLibrary/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift
index e7e0efa931e8..38db861828c3 100644
--- a/samples/client/petstore/swift5/urlsessionLibrary/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift
+++ b/samples/client/petstore/swift5/urlsessionLibrary/PetstoreClient/Classes/OpenAPIs/Models/Dog.swift
@@ -13,7 +13,7 @@ public struct Dog: Codable {
     public var color: String? = "red"
     public var breed: String?
 
-    public init(className: String, color: String? = nil, breed: String? = nil) {
+    public init(className: String, color: String? = "red", breed: String? = nil) {
         self.className = className
         self.color = color
         self.breed = breed
diff --git a/samples/client/petstore/swift5/urlsessionLibrary/PetstoreClient/Classes/OpenAPIs/Models/Order.swift b/samples/client/petstore/swift5/urlsessionLibrary/PetstoreClient/Classes/OpenAPIs/Models/Order.swift
index f1817f7792a1..58e5e78d7c28 100644
--- a/samples/client/petstore/swift5/urlsessionLibrary/PetstoreClient/Classes/OpenAPIs/Models/Order.swift
+++ b/samples/client/petstore/swift5/urlsessionLibrary/PetstoreClient/Classes/OpenAPIs/Models/Order.swift
@@ -22,7 +22,7 @@ public struct Order: Codable {
     public var status: Status?
     public var complete: Bool? = false
 
-    public init(id: Int64? = nil, petId: Int64? = nil, quantity: Int? = nil, shipDate: Date? = nil, status: Status? = nil, complete: Bool? = nil) {
+    public init(id: Int64? = nil, petId: Int64? = nil, quantity: Int? = nil, shipDate: Date? = nil, status: Status? = nil, complete: Bool? = false) {
         self.id = id
         self.petId = petId
         self.quantity = quantity
diff --git a/samples/client/petstore/swift5/urlsessionLibrary/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift b/samples/client/petstore/swift5/urlsessionLibrary/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift
index a9e088808ed3..a53e1589ff5a 100644
--- a/samples/client/petstore/swift5/urlsessionLibrary/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift
+++ b/samples/client/petstore/swift5/urlsessionLibrary/PetstoreClient/Classes/OpenAPIs/Models/TypeHolderDefault.swift
@@ -15,7 +15,7 @@ public struct TypeHolderDefault: Codable {
     public var boolItem: Bool = true
     public var arrayItem: [Int]
 
-    public init(stringItem: String, numberItem: Double, integerItem: Int, boolItem: Bool, arrayItem: [Int]) {
+    public init(stringItem: String = "what", numberItem: Double, integerItem: Int, boolItem: Bool = true, arrayItem: [Int]) {
         self.stringItem = stringItem
         self.numberItem = numberItem
         self.integerItem = integerItem
diff --git a/samples/client/petstore/swift5/urlsessionLibrary/SwaggerClientTests/SwaggerClientTests/StoreAPITests.swift b/samples/client/petstore/swift5/urlsessionLibrary/SwaggerClientTests/SwaggerClientTests/StoreAPITests.swift
index c49f47eee00f..94cb489e5f25 100644
--- a/samples/client/petstore/swift5/urlsessionLibrary/SwaggerClientTests/SwaggerClientTests/StoreAPITests.swift
+++ b/samples/client/petstore/swift5/urlsessionLibrary/SwaggerClientTests/SwaggerClientTests/StoreAPITests.swift
@@ -88,7 +88,7 @@ class StoreAPITests: XCTestCase {
         let progressExpectation = self.expectation(description: "obtain progress")
         let requestBuilder = StoreAPI.getOrderByIdWithRequestBuilder(orderId: 1000)
 
-        requestBuilder.onProgressReady = { (progress) in
+        requestBuilder.onProgressReady = { (_) in
             progressExpectation.fulfill()
         }