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Custom UIViewController Animations — EASY iOS Guide
A nice little guide for you
Difficulty: Beginner | Easy | Normal | Challenging
If you want to have custom transitions between your view controllers, this is the article for you! Equally the repo might help you out. The end result of the tutorial is this fading sceen:
Prerequisites:
* You will need to be familar with the basics of Swift and able to start a Playground (or similar)
* You can follow along with how to create segues here:
Terminology:
Transition animation: The animation that is displayed while a ViewController is displayed with PUSH, POP or other transitions
The theory
Transitioning Delegate:
We start an animation (which is often triggered with a segue. When you present or dismiss a UIViewController, UIKit asks the transitioning delegate UIViewControllerTransitioningDelegate for the animation controller to use.
Animation Controller:
UIViewControllerAnimatedTransitioning is returned from the UIViewControllerTransitioningDelegate from the public func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? function.
The steps
* A transaction is triggered, typically be a transition
* UIKit asks the segue for the transitioning delegate
* The transitioning delegate uses public func animationController(forPresented presented: , presenting: , source: ) -> UIViewControllerAnimatedTransitioning? for the animation
* UIKit constructs the transitioning context
* UIKit uses animateTransition(using:) to perform the animation
* The animation constroller calls completeTransition(_:)
