UITextView in UIModalPresentationFormSheet freezes app iOS 10

Question

I have a UITextView inside a view controller which I present using modal form sheet

vc.modalPresentationStyle = UIModalPresentationFormSheet;
[AppDelegate.rootController presentViewController:vc animated:YES completion:nil];

All was well till iOS 9.3. Then came iOS 10/10.0.1

With this, every time user taps inside the text field to bring up the keypad, the app freezes. I can't figure out why. I tried making the UITextView as first responder. That fires up the keyboard just fine, I can type and hit a button on VC to take action. The VC and keyboard both gets dismissed. But again, if without hitting the button, if I try to simply dismiss the keyboard, app freeze.

Any ideas at all from anyone?

Answer 1

Was experiencing something like this earlier today. The fix for me was as follows (unsure why, something must have changed in iOS 10).

In legacy code:

- (void)viewWillLayoutSubviews {
    self.view.superview.bounds = CGRectMake(0,self.view.superview.bounds.origin.y, 768, 256);
    [super viewWillLayoutSubviews];
}

Removing it fixed my issue.

Answer 2

I moved my code to viewDidLayoutSubviews from viewWillLayoutSubviews. And it does not freeze anymore. Looks like an iOS 10 bug to me.

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()
    self.view.superview!.bounds = CGRectMake(0,0, 500, 300)
}