gcd

Cabeçalho: //// GCDMacros.h//#ifndef GCDMacros_h#define GCDMacros_htypedef void(^VoidBlock)();void UIThread(VoidBlock block);void BackgroundThread(VoidBlock block);#endif Implementação: //// GCDMacros.m//#import “GCDMacros.h”void UIThread(VoidBlock block){ dispatch_async(dispatch_get_main_queue(), block);}void BackgroundThread(VoidBlock block){ dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), block);}