好用的iOS宏定义

安全的主线程调用块定义：

#define dispatch_async_main_safe(block)\

if ([NSThread isMainThread]) {\

block();\

} else {\

dispatch_async(dispatch_get_main_queue(), block);\

}

强引用、弱引用self转换：

#ifndef weakify

#if DEBUG

#if __has_feature(objc_arc)

#define weakify(object) NSAutoreleasePool{} __weak __typeof__(object) weak##_##object = object;

#else

#define weakify(object) NSAutoreleasePool{} __block __typeof__(object) block##_##object = object;

#endif

#else

#if __has_feature(objc_arc)

#define weakify(object) try{} @finally{} {} __weak __typeof__(object) weak##_##object = object;

#else

#define weakify(object) try{} @finally{} {} __block __typeof__(object) block##_##object = object;

#endif 

#endif 

#endif

妈蛋，简书的代码排版有点煞笔啊，逼我转移？