无法使(停止)NSTimer失效 [英] Unable to invalidate (Stop) NSTimer

问题描述

可能重复:
NSTimer不会停止

Possible Duplicate:
NSTimer doesn't stop

我正在使用NSTimer在播放音频时更新滑块的值.

I am using a NSTimer to update the value of a slider while a audio is playing.

 if (sliderUpdateTimer) {
    [sliderUpdateTimer invalidate];
    sliderUpdateTimer=nil;
}

sliderUpdateTimer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(updateSliderForAudio) userInfo:nil repeats:YES];

一旦音频播放完毕，我将使audioPlayer委托方法中的Timer无效.

once the audio is finished playing i am invalidating the Timer in audioPlayer delegate method.

-(void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag{
NSLog(@"audioPlayerDidFinishPlaying");
[player release];
audioPlayer=nil;

[sliderUpdateTimer invalidate];
[sliderUpdateTimer release];
sliderUpdateTimer=nil;

}

正在调用委托方法，但计时器没有停止....我只有一个线程在其上运行计时器.但是计时器仍然没有停止...欢迎您提供任何帮助.

The delegate method is getting called but the timer is not stopping.... I have only once thread on which i am runing the timer. But still the timer does not stop.... Any help in this regard is welcome...

推荐答案

首先，您将过度释放它，并且应该收到EXC_BADACCESS(设置定时器时不会保留定时器，因此不应释放它要么).应该只拨打:

First of all, you would be over releasing it and should receive EXC_BADACCESS (you're not retaining the timer when you set it, so you shouldn't release it either). Should only call:

[sliderUpdateTimer invalidate];
sliderUpdateTimer=nil;

由于您没有收到崩溃的信息，因此在调用audioPlayerDidFinishPlaying:时似乎sliderUpdateTimer是nil.用户NSLog或放置一个断点以检查是否为真.如果是这种情况，您可能会在某个时候将其设置为nil，搜索slideUpdateTimer并检查可能在何处发生.

Since you don't receive a crash, it seems sliderUpdateTimer is nil when calling audioPlayerDidFinishPlaying:. User NSLog or put a breakpoint to check if this is true. If this is the case, you're probably setting it to nil at some point, search for slideUpdateTimer and check where this might occur.

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