将视图切换回无法在Xcode中工作

Question

I am using the following method to switch views:

FirstView.m

-(IBAction)showAnimal:(UIButton *)sender{
    NSString *digit = [NSString stringWithFormat:@"%d",[sender tag]];
     //NSString *digit = [[sender titleLabel] text];


    AppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
    appDelegate.indexOfImage = digit;

    Animal *myAnimal = [[Animal alloc] 
                             initWithNibName:@"Animal" bundle:nil];

    [UIView beginAnimations:@"flipView" context:nil];
    [UIView setAnimationDuration:1.5];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
    [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft  
                           forView:self.view cache:YES];

    [UIView commitAnimations];

    //[self presentModalViewController:myAnimal animated:YES];


    myAnimal.view.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);


    [self.view addSubview:myAnimal.view];

    self.view.bounds = myAnimal.view.bounds;
}

Method on Second View Animal.m

 -(IBAction)backToFront:(id)sender{

[UIView beginAnimations:@"flipView" context:nil];
[UIView setAnimationDuration:1.2];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationTransition:UIViewAnimationTransitionCurlDown
                      forView:self.view.superview cache:YES];


[self.view removeFromSuperview];
[UIView commitAnimations];

}

I used this code several times and it always worked without any problems, until now. My app is crushing every time when I want to switch back. So the method on the Animal view crashes. The weird thing is that I get an odd error. I got a screenshot of that.

Please help!

Answer 1

EXC_BAD_ACCESS通常在处理发行对象（僵尸）时出现。.转到产品>编辑方案>在环境变量区域中，将NSZombieEnabled值添加为yes ..这将向您显示控制台中的僵尸对象。

Answer 2

I think what's happening here is that you're removing the view from its superview before the animation is complete. If your view controller hasn't retained the view that's removed, it'll be released and probably deallocated as soon as it's removed. The animation will cause the bad access exception you're getting because it's trying to access an object that's no longer there.

To fix, avoid removing the view from the superview until after the animation has completed.

Answer 3

Thanks for your help but I found another way to handle that error. You were right. The previous view was deallocated before returning to him. That was due to ARC(Automatic reference counting) so I turned it off using this article . So I'll give both of you points for helping me! I appreciate it!