Created
November 19, 2020 06:32
-
-
Save brunomunizaf/93f469a7a277911060f2a7659b97557f to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| import UIKit | |
| final class Transition: NSObject, UIViewControllerAnimatedTransitioning { | |
| enum Direction { | |
| case present | |
| case dismiss | |
| } | |
| var direction: Direction = .present | |
| private var presentedConstraints: [NSLayoutConstraint] = [] | |
| private var dismissedConstraints: [NSLayoutConstraint] = [] | |
| func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval { 0.5 } | |
| func animateTransition(using transitionContext: UIViewControllerContextTransitioning) { | |
| switch direction { | |
| case .present: | |
| present(using: transitionContext) | |
| case .dismiss: | |
| dismiss(using: transitionContext) | |
| } | |
| } | |
| private func present(using context: UIViewControllerContextTransitioning) { | |
| guard let presentedView = context.view(forKey: .to) else { | |
| context.completeTransition(false) | |
| return | |
| } | |
| context.containerView.addSubview(presentedView) | |
| presentedView.translatesAutoresizingMaskIntoConstraints = false | |
| presentedConstraints = [ | |
| presentedView.leftAnchor.constraint(equalTo: context.containerView.leftAnchor), | |
| presentedView.rightAnchor.constraint(equalTo: context.containerView.rightAnchor), | |
| presentedView.topAnchor.constraint(equalTo: context.containerView.topAnchor), | |
| presentedView.bottomAnchor.constraint(equalTo: context.containerView.bottomAnchor) | |
| ] | |
| dismissedConstraints = [ | |
| presentedView.leftAnchor.constraint(equalTo: context.containerView.leftAnchor), | |
| presentedView.rightAnchor.constraint(equalTo: context.containerView.rightAnchor), | |
| presentedView.topAnchor.constraint(equalTo: context.containerView.topAnchor), | |
| presentedView.bottomAnchor.constraint(equalTo: context.containerView.centerYAnchor) | |
| ] | |
| NSLayoutConstraint.activate(dismissedConstraints) | |
| context.containerView.setNeedsLayout() | |
| context.containerView.layoutIfNeeded() | |
| NSLayoutConstraint.deactivate(dismissedConstraints) | |
| NSLayoutConstraint.activate(presentedConstraints) | |
| UIView.animate( | |
| withDuration: transitionDuration(using: context), | |
| delay: 0, | |
| usingSpringWithDamping: 1, | |
| initialSpringVelocity: 0, | |
| options: .curveEaseInOut, | |
| animations: { | |
| context.containerView.setNeedsLayout() | |
| context.containerView.layoutIfNeeded() | |
| }, | |
| completion: { _ in | |
| context.completeTransition(true) | |
| }) | |
| } | |
| private func dismiss(using context: UIViewControllerContextTransitioning) { | |
| NSLayoutConstraint.deactivate(presentedConstraints) | |
| NSLayoutConstraint.activate(dismissedConstraints) | |
| UIView.animate( | |
| withDuration: transitionDuration(using: context), | |
| delay: 0, | |
| usingSpringWithDamping: 1, | |
| initialSpringVelocity: 0, | |
| options: .curveEaseInOut, | |
| animations: { | |
| context.containerView.setNeedsLayout() | |
| context.containerView.layoutIfNeeded() | |
| }, | |
| completion: { _ in | |
| context.completeTransition(true) | |
| }) | |
| } | |
| } |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment