[ObjC] Fix various bugs in generated code. (#3031)

* [ObjC] Fix bug where ApiClient.timeoutInterval didn't do anything.

* [ObjC] Fix bug where <AFNetworking.h> couldn't be found.

* [ObjC] Fix useages of 'SWG' instead of {{classPrefix}} in Sanitizer-body.mustache.

modules/swagger-codegen/src/main/resources/objc/ApiClient-body.mustache

@@ -50,6 +50,7 @@ static NSString * {{classPrefix}}__fileNameForResponse(NSURLResponse *response)
 - (instancetype)initWithBaseURL:(NSURL *)url {
     self = [super initWithBaseURL:url];
     if (self) {
+        self.timeoutInterval = 60;
         self.requestSerializer = [AFJSONRequestSerializer serializer];
         self.responseSerializer = [AFJSONResponseSerializer serializer];
         self.securityPolicy = [self customSecurityPolicy];
@@ -87,6 +88,11 @@ static NSString * {{classPrefix}}__fileNameForResponse(NSURLResponse *response)
     [self.requestSerializer setValue:value forHTTPHeaderField:forKey];
 }
 
+- (void)setRequestSerializer:(AFHTTPRequestSerializer<AFURLRequestSerialization> *)requestSerializer {
+    [super setRequestSerializer:requestSerializer];
+    requestSerializer.timeoutInterval = self.timeoutInterval;
+}
+
 #pragma mark - Cache Methods
 
 +(void)clearCache {

modules/swagger-codegen/src/main/resources/objc/ApiClient-header.mustache

@@ -1,6 +1,6 @@
 #import <Foundation/Foundation.h>
 #import <ISO8601/ISO8601.h>
-#import <AFNetworking.h>
+#import <AFNetworking/AFNetworking.h>
 #import "{{classPrefix}}JSONResponseSerializer.h"
 #import "{{classPrefix}}JSONRequestSerializer.h"
 #import "{{classPrefix}}QueryParamCollection.h"

modules/swagger-codegen/src/main/resources/objc/Sanitizer-body.mustache

@@ -35,13 +35,13 @@ NSString * {{classPrefix}}PercentEscapedStringFromString(NSString *string) {
     return escaped;
 }
 
-@interface SWGSanitizer ()
+@interface {{classPrefix}}Sanitizer ()
 
 @property (nonatomic, strong) NSRegularExpression* jsonHeaderTypeExpression;
 
 @end
 
-@implementation SWGSanitizer
+@implementation {{classPrefix}}Sanitizer
 
 static NSString * kApplicationJSONType = @"application/json";