停止performSelector：执行 [英] Stopping a performSelector: from being performed

问题描述

非常基本的问题。

[self performSelector:@selector(startSequence:) withObject:nil afterDelay:1.0];

然而，有没有办法在它被调用后停止它？
感谢您的帮助
迪斯科

However, is there a way to stop this after its been called? Thanks for any help Disco

推荐答案

您想要 + [ NSObject cancelPreviousPerformRequestsWithTarget：] 。如果有多个执行请求在等待，这将取消所有请求。

You want +[NSObject cancelPreviousPerformRequestsWithTarget:]. If there are multiple perform requests waiting, this will cancel all of them.

如果你想要一些更细粒度的控制，你可以使用 + [NSObject cancelPreviousPerformRequestsWithTarget：selector：object：] 。与谓词匹配的所有内容都将被取消;如果您有多个相同的请求在等待，则没有机制可以取消单个请求。

If you want some finer-grained control, you can use +[NSObject cancelPreviousPerformRequestsWithTarget:selector:object:]. Everything matching the predicate is cancelled; if you have multiple identical requests waiting, there's no mechanism to cancel a single one.

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