Unwind segue does not release my view controllers

问题:

I have something like this:

My rootViewController is a navigationBar - let this be A. The rest are normal UIViewControllers, and are programmatically segue via push (through a button IBAction method).

However going from D -> A, I use unwind segue (also via performSegueWithIdentifier:sender:).

The issue here is that when the segue is performed, B, C and D are not deallocatedat all. Not only is this causing a memory leak issue but my timers are still running. I'm not sure why this is the case. I thought unwind segues are suppose to handle all these for you? Any idea why?

回答1:

The issue is with the NSTimer.

NSTimer retain their target. So if a view controller starts a timer with target:self, it will not be deallocated as long as the timer is running.

You can get more information here

回答2:

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

Hope this will help you...for timer invalidate on other controller