方法1:performSelector
// 1.5s后自动调用self的test方法 [self performSelector:@selector(test) withObject:nil afterDelay:1.5];
方法2:GCD
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ // 1.5s后自动执行这个block里面的代码 self.myView.alpha = 0.0; });
方法3:NSTimer
// 1.5s后自动调用self的test方法 [NSTimer scheduledTimerWithTimeInterval:1.5 target:self selector:@selector(test) userInfo:nil repeats:NO]; // repeats如果为YES,意味着每隔1.5s都会调用一次self的test方法