AutoLayout: removeFromSuperview / removeConstraints throws exception and crashes hard

Question

We use auto layout constraints selectively, primarily to position labels in relation to editable field elements (UITextView, UITextField, typically). However, since impleme

Answer 1

I got this problem with MZFormSheetController pod: https://github.com/m1entus/MZFormSheetController/issues/78

This code crashes:

[formSheetController.view addSubview:self.sharePanel];
// ...
[self.sharePanel removeFromSuperview]; // <-- CRASHES HERE

My solution is very strange but it works:

[self.sharePanel removeFromSuperview]; // <-- This line helps to avoid crash
[formSheetController.view addSubview:self.sharePanel];
// ...
[self.sharePanel removeFromSuperview];

And here is sharePanel property declaration:

@property (weak, nonatomic) IBOutlet UIView *sharePanel;