Unbalanced calls to begin/end appearance transitions for

Question

I have this problem when I simulate my app, its not an error or a warning but it appears in my console, has anyone ever experienced this before?

Answer 1

Ensure that you do not forget to in -viewWillAppear, -viewDidAppear, -viewDidLoad, -viewWillDisappear, -viewDidDisappear to call proper super method in your overload of that methods. For example in my case I mismatched method name like this:

-(void)viewDidAppear
{
 [super viewDidDisappear];
 //some code staff
 ..
}

notice that appear and disappear methods are mismatched

Answer 2

I have this problem too. I found two solutions to this problem:

1. You can see this solution above.
2. I found subclass from UINavigationController where this problem resolved. Buffered Navigation Controller

Answer 3

I had the same issue using navigation controller and push other controllers to it. I tried to use Buffered Navigation Controller and several other approaches, but it didn't work for me. After spending some time for figuring it out I noticed that this issue occurs if you trying to push new view controller while previous transaction (animation) in progress (about 0.5 sec duration I guess). Anyway, I made quick solution with delegating navigation controller and waiting for previous animation finishes.

Answer 4

I had a similar problem that involved rewinding modal dialogs. Posted the solution here...

https://stackoverflow.com/a/38795258/324479

[Problem]

Nav Controller -> VC1 -Push--> VC2 -PopOver or Modal Segue--> VC3.

VC3 is unwinding back to VC1.

When the Segue from VC2 to VC3 is PopOver and Modal, the unwind ends in a warning: Unbalanced calls to begin/end appearance transitions for UIViewController"

If the Segue from VC to VC is push, the warning is gone.

[Solution]

It would be great if the unwind logic would take care of this. Maybe it's a bug, maybe not. Either way, the solution is to make VC2 (The controller that has the popup) the target of the rewind, then wait for it to finish appearing before popping up the nav controller. That ensures the rewind (reverse popup) animation has enough time to finish before moving further back. Even with the animations off, it still has to wait or else you get the error.

Your code for VC2 should be as follows. (Swift)

class VC2: UIViewController {
    private var unwind = false
    @IBAction func unwindToVC1(segue:UIStoryboardSegue) {
        unwind = true
    }

    override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated)

        if unwind {
            self.navigationController?.popViewControllerAnimated(false)
        }
    }
}

Answer 5

'Unbalanced calls to begin/end appearance transitions for '

Says an animation is started before the last related animation isn't done. So, are you popping any view controller before pushing the new one ? Or may be popping to root ? if yes try doing so without animation i.e. [self.navigationController popToRootViewControllerAnimated:NO];

And see if this resolves the issue, In my case this did the trick.

Answer 6

I also got this at

[self dismissModalViewControllerAnimated:YES];

I changed the YES to a NO, and that solved the problem.