[Issue #2119] Adding check for AF_APP_EXTENSIONS macro to conditional…

…ly compile background method that makes unavailable API (+[UIApplication sharedApplication] call in app extensions

AFNetworking/AFURLConnectionOperation.h

@@ -63,6 +63,10 @@
  SSL with certificate pinning is strongly recommended for any application that transmits sensitive information to an external webservice.
 
  Connections will be validated on all matching certificates with a `.cer` extension in the bundle root.
+ 
+ ## App Extensions
+ 
+ When using AFNetworking in an App Extension, `#define AF_APP_EXTENSIONS` to avoid using unavailable APIs.
 
  ## NSCoding & NSCopying Conformance
 
@@ -245,8 +249,8 @@
  Specifies that the operation should continue execution after the app has entered the background, and the expiration handler for that background task.
 
  @param handler A handler to be called shortly before the application’s remaining background time reaches 0. The handler is wrapped in a block that cancels the operation, and cleans up and marks the end of execution, unlike the `handler` parameter in `UIApplication -beginBackgroundTaskWithExpirationHandler:`, which expects this to be done in the handler itself. The handler is called synchronously on the main thread, thus blocking the application’s suspension momentarily while the application is notified.
- */
-#if defined(__IPHONE_OS_VERSION_MIN_REQUIRED)
+  */
+#if defined(__IPHONE_OS_VERSION_MIN_REQUIRED) && !defined(AF_APP_EXTENSIONS)
 - (void)setShouldExecuteAsBackgroundTaskWithExpirationHandler:(void (^)(void))handler;
 #endif
 

AFNetworking/AFURLConnectionOperation.m

@@ -38,7 +38,7 @@ typedef NS_ENUM(NSInteger, AFOperationState) {
     AFOperationFinishedState    = 3,
 };
 
-#if defined(__IPHONE_OS_VERSION_MIN_REQUIRED)
+#if defined(__IPHONE_OS_VERSION_MIN_REQUIRED) && !defined(AF_APP_EXTENSIONS)
 typedef UIBackgroundTaskIdentifier AFBackgroundTaskIdentifier;
 #else
 typedef id AFBackgroundTaskIdentifier;
@@ -215,7 +215,7 @@ - (void)dealloc {
         _outputStream = nil;
     }
 
-#if defined(__IPHONE_OS_VERSION_MIN_REQUIRED)
+#if defined(__IPHONE_OS_VERSION_MIN_REQUIRED) && !defined(AF_APP_EXTENSIONS)
     if (_backgroundTaskIdentifier) {
         [[UIApplication sharedApplication] endBackgroundTask:_backgroundTaskIdentifier];
         _backgroundTaskIdentifier = UIBackgroundTaskInvalid;
@@ -293,7 +293,7 @@ - (void)setOutputStream:(NSOutputStream *)outputStream {
     [self.lock unlock];
 }
 
-#if defined(__IPHONE_OS_VERSION_MIN_REQUIRED)
+#if defined(__IPHONE_OS_VERSION_MIN_REQUIRED) && !defined(AF_APP_EXTENSIONS)
 - (void)setShouldExecuteAsBackgroundTaskWithExpirationHandler:(void (^)(void))handler {
     [self.lock lock];
     if (!self.backgroundTaskIdentifier) {