cancelPreviousPerformRequestsWithTarget

最新推荐文章于 2018-12-20 13:36:58 发布

原创最新推荐文章于 2018-12-20 13:36:58 发布 · 2.9k 阅读

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本文详细介绍了如何在代码中执行和取消执行特定操作的方法，包括使用`performSelector:withObject:afterDelay:`和`cancelPreviousPerformRequestsWithTarget:selector:object:`函数。这些方法对于实现定时任务和操作控制至关重要。

1.执行

[self performSelector:@selector(showNextMessage) withObject:nil afterDelay:1];

2.取消

[NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(showNextMessage) object:nil];

Cancels perform requests previously registered with performSelector:withObject:afterDelay:.
	All perform requests are canceled that have the same target as aTarget, argument as anArgument, and selector as aSelector. This method removes perform requests only in the current run loop, not all run loops.