AWPercentDrivenInteractiveTransition is a drop-in replacement for UIPercentDrivenInteractiveTransition for use in custom container view controllers.

Why do you need it? Because Apples own UIPercentDrivenInteractiveTransition calls undocumented methods on your custom UIViewControllerContextTransitioning objects.

Note that this class can be used with UIKits standard container view controllers such as UINavigationController, UITabBarController and also for presenting modal view controllers.

Status

0.2.0 - Added support for changing completionSpeed 0.1.0 - Basic functionality implemented, usable for a majority of cases

Unimplemented features

• completionSpeed can't be changed from 1.0 (fixed in 0.2.0)
• completionCurve can't be changed from UIViewAnimationCurveLinear
• No support for UIViewControllerTransitionCoordinator (for animating other views along transition)

Installation

Source files

Alternatively you can directly add the AWPercentDrivenInteractiveTransition.h and AWPercentDrivenInteractiveTransition.m source files to your project.

1. Download the latest code version or add the repository as a git submodule to your git-tracked project.
2. Open your project in Xcode, then drag and drop AWPercentDrivenInteractiveTransition.h and AWPercentDrivenInteractiveTransition.m onto your project (use the "Product Navigator view"). Make sure to select Copy items when asked if you extracted the code archive outside of your project.
3. Include AWPercentDrivenInteractiveTransition wherever you need it with #import "AWPercentDrivenInteractiveTransition.m".

Static library

If you don't want to compile my code all the time, there's an XCode project in the lib folder which generates a static libAWPercentDrivenInteractiveTransition.a library file you can include in your project. Just remember to include the original LICENCE file in your source code.

Usage

Use as you would do with a regular UIPercentDrivenInteractiveTransition. Either by letting your custom interaction controller subclass AWPercentDrivenInteractiveTransition or by having an instance and manually call the updateInteractiveTransition:, cancelInteractiveTransition and finishInteractiveTransition methods.

The only difference is that you need to set the animator property with a UIViewControllerAnimatedTransitioning object before starting an interactive transition.

This is what the standard UIPercentDrivenInteractiveTransition does by calling private methods on your UIViewControllerContextTransitioning object.

There's also a convinience initializer called initWithAnimator: that sets the animator property directly.

Demo

If you wanna se a demo of this drop-in replacement class in action, check out my blog post on Interactive Custom Container View Controller Transitions.

Licence

This code is distributed under the terms and conditions of the MIT license.