取消[self performSelector：... withObject：nil afterDelay：20]; [英] Cancel [self performSelector:... withObject:nil afterDelay:20];

问题描述

我在viewDidLoad中使用以下代码调用方法sr，如何在sr将调用的方法之前取消它？

I call method sr in viewDidLoad with below code,how can i cancel it before that method sr will call?

[self performSelector:@selector(sr) withObject:nil afterDelay:20]; 

推荐答案

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

请阅读文档。 :) -performSelector：withObject：afterDelay： 指向取消排队执行请求的方法。

Please read the documentation. :) The documentation for -performSelector:withObject:afterDelay: points you to the methods for canceling a queued perform request.

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