更新强弱引用

Useful-Defines.m

//在主线程同步安全执行
#define dispatch_main_sync_safe(block)\
    if ([NSThread isMainThread]) {\
        block();\
    } else {\
        dispatch_sync(dispatch_get_main_queue(), block);\
    }

//在主线程异步安全执行
#define dispatch_main_async_safe(block)\
    if ([NSThread isMainThread]) {\
        block();\
    } else {\
        dispatch_async(dispatch_get_main_queue(), block);\
    }



// 过期提醒
#define WD_DEPRECATED(comment)          __attribute__((deprecated(comment)))
#define WD_DEPRECATED_ATTRIBUTE         __attribute__((deprecated))
#define WD_CLASS_DEPRECATED(comment)    __attribute__((deprecated(comment)))

//强弱引用
#define weakify(var) __weak typeof(var) weak_##var = var;

#define strongify(var) \
_Pragma("clang diagnostic push") \
_Pragma("clang diagnostic ignored \"-Wshadow\"") \
__strong typeof(var) var = weak_##var; \
_Pragma("clang diagnostic pop")