AFNetworking 2.0 當Deployment Target 低于6.0時，AFURLConnectionOperation.h,AFURLSessionManager.h

@property (nonatomic, strong) dispatch_queue_t completionQueue;

因為sdk低于6.0時，dispatch_queue_t??ARC沒有托管，出現提示錯誤

Property with 'retain (or strong)' attribute must be of object type

改動為

#if OS_OBJECT_USE_OBJC @property (nonatomic, strong) dispatch_queue_t completionQueue; #else @property (nonatomic, assign) dispatch_queue_t completionQueue; #endif

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