NSTimer getting zombie

I have created a NSTimer in my application which gets fired after every 1 min interval. my problem is when I put the application in ba开发者_Go百科ckground and after some time say 5 min, i bring that in foreground, the timer object gets zombied.

any thoughts on this.

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Perhaps invalidate the timer when the application enters the background then start it again when the application enters the foreground.

Like so:

- (void)applicationDidEnterBackground:(UIApplication *)application
{
    [myTimer invalidate];
}

- (void)applicationWillEnterForeground:(UIApplication *)application
{
    myTimer = [NSTimer scheduledTimerWithTimeInterval:60.0 target:self selector:@selector(TimerFunction) userInfo:nil repeats:YES];
}

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NSTimer objects are retained when scheduled. Your timer might be invalidated for some reason and by thus, released.