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Custom modal transition

A custom transition I developed for one of my apps. It works on iOS 7 - iOS 8.2.

UIPresentationController update (iOS 8 only)

A solution using UIPresentationController and without iOS 7 hacks can be found in ios8 branch. It features properly handled appearance events, device orientations support and much less code.

Caveats

  • Controllers will not properly rotate if orientation changed when presented. There is only one exception, if presented controller is a navigation controller, then rotation works fine. This seems to be a UIKit bug on iOS 7 or iOS 8. UIPresentationController solves that problem by providing a way to resize controllers on orientation change.

  • State restoration is possible but presented VC should restore transitioningDelegate, modalPresentationStyle and modalPresentationCapturesStatusBarAppearance. If you use storyboards then it's easy:

    - (void)encodeRestorableStateWithCoder:(NSCoder *)coder {
  [super encodeRestorableStateWithCoder:coder];
  
  [coder encodeInteger:self.modalPresentationStyle forKey:@"modalPresentationStyle"];
  [coder encodeInteger:self.modalPresentationCapturesStatusBarAppearance forKey:@"modalPresentationCapturesStatusBarAppearance"];
  [coder encodeObject:self.transitioningDelegate forKey:@"transitioningDelegate"];
}

- (void)decodeRestorableStateWithCoder:(NSCoder *)coder {
  [super decodeRestorableStateWithCoder:coder];
	
  self.modalPresentationStyle = [coder decodeIntegerForKey:@"modalPresentationStyle"];
  self.modalPresentationCapturesStatusBarAppearance = [coder decodeIntegerForKey:@"modalPresentationCapturesStatusBarAppearance"];
  self.transitioningDelegate = [coder decodeObjectForKey:@"transitioningDelegate"];
}

Blog post

This project is a part of my blog post. However lots of things changed since original blog post was published.

  • Unwinding works fine if you fix segueForUnwindingToViewController in source navigation controller and create unwind segue using source view controller. Works for both iOS 7 and 8 (see http://stackoverflow.com/a/28607309/351305)
  • Resetting views' frames to container bounds before adding them to container helps to solve issues with misplaced navigation bar and rotation issues on iOS 7.