1.performSelector
[self performSelector:@selector(removeViews) withObject:nil afterDelay:5.0];
2.NSTimer 触发定时任务
NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(removeViews) userInfo:nil repeats:NO];
[timer setFireDate:[NSDate dateWithTimeIntervalSinceNow:5.0]];
3.使用GCD
dispatch_time_t delayTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(5.0 * NSEC_PER_SEC));
dispatch_after(delayTime, dispatch_get_main_queue(), ^{
[self removeViews];
});
4.NSThread 阻塞子线程
[NSThread sleepForTimeInterval:5];
[self removeViews];
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