iOS-主线程刷新UI【+单例】

主线程刷新UI

dispatch_async(dispatch_get_main_queue(), ^{ /// });

单例

static Tools *_sharedManger; @implementation Tools + (SingleTools *)sharedManger{ static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{ if (!_sharedManger) { _sharedManger = [[Tools alloc]init]; } }); return _sharedManger; }
 @end