iphone - 我想使所有 [self performSelector :@selector(showLyrics) withObject:nil afterDelay:2];

Question

我正在添加

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

但如果用户重新启动歌曲，则不应执行此选择器。所以我只想知道我怎样才能取消它。因为 20 秒后它会被调用，但我不想那样，并重新安排

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

我有很多

[self performSelector:@selector(showLyrics) withObject:nil afterDelay:2];

我想取消我之前安排的所有这些。

Answer 1

[[NSRunLoop currentRunLoop] cancelPerformSelector:@selector(showLyrics) 
                                           target:self
                                         argument:nil];