The document discusses the implementation of iOS transition animations for app development, emphasizing the use of delegates and custom animations, such as fade and pop transitions. It provides examples of code and techniques for managing animations in navigation controllers to create interactive user experiences. Overall, it highlights the importance of integrating smooth transitions into iOS applications to enhance usability and engagement.

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{
open func transitionDuration(using transitionContext:
UIViewControllerContextTransitioning?) ->
TimeInterval {
return 0.5
}
open override func animateTransition(using
transitionContext: UIViewControllerContextTransitioning)
{
guard
let toViewController = transitionContext.viewController(forKey:
.to) else {
return
}
transitionContext.containerView.addSubview(toViewController.vi
ew) toViewController.view.alpha = 0
let duration = self.transitionDuration(using:
transitionContext) UIView.animate(withDuration:
duration, animations: { toViewController.view.alpha = 1
}, completion: { _ in

6. transitionContext.completeTransition(!
transitionContext.transitionWasCanc elled)
})
}
}
You may understand that growing a custom iOS transition animations
is quite simple. You want to put into the effect the delegate
techniques. On 2 techniques, one will go back to the period of the
animation, and the other will include the real iOS transition
animations.
In that transition context, it presents a custom box view item that’s
what you may use within the animation, and additionally, you may
seize the collaborating perspectives and controllers from these items
as referred to before.
open class FadePopAnimator: CustomAnimator {
open func transitionDuration(using transitionContext:
UIViewControllerContextTransitioning?) ->
TimeInterval {
return 0.5
}
open override func animateTransition(using
transitionContext: UIViewControllerContextTransitioning)
{
guard
let fromViewController =
transitionContext.viewController(forKey: .from), let toViewController
= transitionContext.viewController(forKey: .to)
else {

7. }
transitionContext.containerView.insertSubview(toViewController.vi
ew, belowSubview: fromViewController.view)
let duration = self.transitionDuration(using:
transitionContext) UIView.animate(withDuration:
duration, animations: { fromViewController.view.alpha = 0
}, completion: { _ in
transitionContext.completeTransition(!
transitionContext.transitionWasCanc elled)
})
}
}
At last, you want to update the navigation controller’s to
delegate the approach of extrude the integrated UIKit device
animation.
extension MainViewController: UINavigationControllerDelegate
{
func navigationController(_ navigationController:
UINavigationController, animationControllerFor operation:
UINavigationController.Operation, from fromVC: UIViewController,
to toVC: UIViewController) ->
UIViewControllerAnimatedTransitioning? { switch operation {
case .push:
return FadePushAnimator()

8. case .pop:
return
FadePopAnimator()
default:
return nil
}
}
}
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DetailViewController: UIViewController {
var interactionController:
UIPercentDrivenInteractiveTransition? override func
viewDidLoad() {
super.viewDidLoad()
self.view.backgroundColor
= .lightGray
let edge = UIScreenEdgePanGestureRecognizer(target:
self, action: #selector(self.handleEdgePan(_:)))
edge.edges = .left
self.view.addGestureRecognizer(edg
e)
}
override func viewDidAppear(_ animated:
Bool) { super.viewDidAppear(animated)
self.navigationController?.delegate = self
}
@objc func handleEdgePan(_ gesture:
UIScreenEdgePanGestureRecognizer)
{
let translate = gesture.translation(in:

10. case .began:
self.interactionController =
UIPercentDrivenInteractiveTransition()
self.navigationController?.popViewController(animated: true)
case .changed:
self.interactionController?.update(perce
nt) case .ended:
let velocity = gesture.velocity(in:
gesture.view) if percent > 0.5 || velocity.x >
0 { self.interactionController?.finish()
}
else
{ self.interactionController?.can
cel()
}
self.interactionController =
nil default:
break
}
}
}
extension
DetailViewController:
UINavigationControllerDele

11. /* … */
func navigationController(_ navigationController:
UINavigationController,
interactionControllerFor
animationController:
UIViewControllerAnimatedTransitioning)
->
UIViewControllerInteractiveTransitioning? {
return self.interactionController
}
}
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class DetailViewController: UIViewController {
/* … */
override func prepare(for segue: UIStoryboardSegue, sender:
Any?) { super.prepare(for: segue, sender: sender)
guard let controller = segue.destination as? ModalViewController
else { return
}
controller.transitioningDelegate = self
controller.modalPresentationStyle = .custom
controller.modalPresentationCapturesStatusBarAppearance =
true
}

13. Next, we cross the transitioning delegate, we have already got one
item of the usage has equal objects.
extension DetailViewController:
UIViewControllerTransitioningDelegate { func
animationController(forPresented presented: UIViewController,
presenting: UIViewController,
source: UIViewController) ->
UIViewControllerAnimatedTransitioning? { return
FadePushAnimator()
}
func animationController(forDismissed dismissed:
UIViewController) -> UIViewControllerAnimatedTransitioning? {
return FadePopAnimator()
}
}
If you run the code that ought to work in high-quality which
includes the prevailing modal view controller. Now you may
attempt to update the provided controller has been a hassle, that
takes place in the entire app which will flip to a black display.
(pop != dismiss) && (push != present)
To clean the hassle, you need to regulate the pop animation for buying
your display and the animations again. Basically, the hassle is out of
the place where the perspectives and reminiscence the management.
open class FadePopAnimator: NSObject,
UIViewControllerAnimatedTransitioning
{
public enum TransitionType {

14. case navigation
case modal
}
let type: TransitionType
let duration:
TimeInterval
public init(type: TransitionType, duration: TimeInterval =
0.25) { self.type = type
self.duration =
duration super.init()
}
open func transitionDuration(using transitionContext:
UIViewControllerContextTransitioning?) ->
TimeInterval {
return self.duration
}
open override func animateTransition(using
transitionContext: UIViewControllerContextTransitioning)
{
guard
let fromViewController =
transitionContext.viewController(forKey: .from) else {
return
}

15. if self.type == .navigation, let
toViewController =
transitionContext.viewController(forKey: .to) {
transitionContext.containerView.insertSubview(toViewController.vi
ew, belowSubview: fromViewController.view)
}
let duration = self.transitionDuration(using:
transitionContext) UIView.animate(withDuration:
duration, animations: { fromViewController.view.alpha = 0
}, completion: { _ in
transitionContext.completeTransition(!
transitionContext.transitionWasCanc elled)
})
}
}
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