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[操作系统]AFNetworking编译报错  Property with retain (or strong) attribute must be of object type

AFNetworking 2.0 当Deployment Target 低于6.0时,AFURLConnectionOperation.h,AFURLSessionManager.h

@property (nonatomic, strong) dispatch_queue_t completionQueue;

由于sdk低于6.0时,dispatch_queue_t  ARC没有托管,出现提示错误

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

修改为

#if OS_OBJECT_USE_OBJC

@property (nonatomic, strong) dispatch_queue_t completionQueue;

#else

@property (nonatomic, assign) dispatch_queue_t completionQueue;

#endif

/**

 The dispatch group for `completionBlock`. If `NULL` (default), a private dispatch group is used.

 */

#if OS_OBJECT_USE_OBJC

@property (nonatomic, strong) dispatch_group_t completionGroup;

#else

@property (nonatomic, assign) dispatch_group_t completionGroup;

#endif