NSTimer 不会停止 [英] NSTimer doesn't stop

问题描述

我有一个计时器，它在调用 viewWillAppear 方法时触发，并在调用 viewDidDisappear 方法时失效.但是在视图之间切换了一定数量后，即使在它无效之后，计时器仍会继续触发.有什么问题?

I've got a timer which fires when the viewWillAppear method is being called and invalidates when the viewDidDisappear method is being called. But after a certain amount of switching between views the timer continues firing even after it was invalidated. What's the problem?

这是我的代码:

NSTimer *timer;

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    timer = [NSTimer scheduledTimerWithTimeInterval: 0.2f
                     target: self
                     selector:@selector( timerAction )
                     userInfo:nil
                     repeats:YES];
}

-(void)viewDidDisappear:(BOOL)animated {
    [super viewDidDisappear:animated];
    [timer invalidate];
    timer = nil;
}

-(void) timerAction
{
    NSLog(@"timerAction");
}

推荐答案

我应该通过保留它来保持指向计时器的链接.:)我 5 个月前问过这个问题，令人惊讶的是，我获得了多少经验.:)

I should have been keeping a link to the timer by retaining it. :) I've asked this question 5 months ago, and it's amazing, how much more experience I acquired. :)

timer = [ [NSTimer scheduledTimerWithTimeInterval: ...] retain];
...
...
[timer invalidate];
[timer release];

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