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| 1 | +// |
| 2 | +// ImageViewerTransitionPresentationManager.swift |
| 3 | +// ImageViewer.swift |
| 4 | +// |
| 5 | +// Created by Michael Henry Pantaleon on 2020/08/19. |
| 6 | +// |
| 7 | + |
| 8 | +import Foundation |
| 9 | +import UIKit |
| 10 | + |
| 11 | +protocol ImageViewerTransitionViewControllerConvertible { |
| 12 | + |
| 13 | + // The source view |
| 14 | + var sourceView: UIImageView? { get } |
| 15 | + |
| 16 | + // The final view |
| 17 | + var targetView: UIImageView? { get } |
| 18 | +} |
| 19 | + |
| 20 | +final class ImageViewerTransitionPresentationAnimator:NSObject { |
| 21 | + |
| 22 | + let isPresenting: Bool |
| 23 | + |
| 24 | + init(isPresenting: Bool) { |
| 25 | + self.isPresenting = isPresenting |
| 26 | + super.init() |
| 27 | + } |
| 28 | +} |
| 29 | + |
| 30 | +// MARK: - UIViewControllerAnimatedTransitioning |
| 31 | +extension ImageViewerTransitionPresentationAnimator: UIViewControllerAnimatedTransitioning { |
| 32 | + |
| 33 | + func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) |
| 34 | + -> TimeInterval { |
| 35 | + return 0.3 |
| 36 | + } |
| 37 | + |
| 38 | + func animateTransition(using transitionContext: UIViewControllerContextTransitioning) { |
| 39 | + let key: UITransitionContextViewControllerKey = isPresenting ? .to : .from |
| 40 | + guard let controller = transitionContext.viewController(forKey: key) |
| 41 | + else { return } |
| 42 | + |
| 43 | + let animationDuration = transitionDuration(using: transitionContext) |
| 44 | + |
| 45 | + if isPresenting { |
| 46 | + presentAnimation( |
| 47 | + transitionView: transitionContext.containerView, |
| 48 | + controller: controller, |
| 49 | + duration: animationDuration) { finished in |
| 50 | + transitionContext.completeTransition(finished) |
| 51 | + } |
| 52 | + |
| 53 | + } else { |
| 54 | + dismissAnimation( |
| 55 | + transitionView: transitionContext.containerView, |
| 56 | + controller: controller, |
| 57 | + duration: animationDuration) { finished in |
| 58 | + transitionContext.completeTransition(finished) |
| 59 | + } |
| 60 | + } |
| 61 | + } |
| 62 | + |
| 63 | + private func createDummyImageView(frame: CGRect, image:UIImage? = nil) |
| 64 | + -> UIImageView { |
| 65 | + let dummyImageView:UIImageView = UIImageView(frame: frame) |
| 66 | + dummyImageView.clipsToBounds = true |
| 67 | + dummyImageView.contentMode = .scaleAspectFill |
| 68 | + dummyImageView.alpha = 1.0 |
| 69 | + dummyImageView.image = image |
| 70 | + return dummyImageView |
| 71 | + } |
| 72 | + |
| 73 | + private func presentAnimation( |
| 74 | + transitionView:UIView, |
| 75 | + controller: UIViewController, |
| 76 | + duration: TimeInterval, |
| 77 | + completed: @escaping((Bool) -> Void)) { |
| 78 | + |
| 79 | + guard |
| 80 | + let transitionVC = controller as? ImageViewerTransitionViewControllerConvertible |
| 81 | + else { return } |
| 82 | + |
| 83 | + let sourceView = transitionVC.sourceView |
| 84 | + |
| 85 | + let dummyImageView = createDummyImageView( |
| 86 | + frame: sourceView?.frameRelativeToWindow() ?? .zero, |
| 87 | + image: sourceView?.image) |
| 88 | + transitionView.addSubview(dummyImageView) |
| 89 | + |
| 90 | + sourceView?.alpha = 0.0 |
| 91 | + |
| 92 | + transitionView.addSubview(controller.view) |
| 93 | + controller.view.alpha = 0.0 |
| 94 | + |
| 95 | + UIView.animate(withDuration: duration, animations: { |
| 96 | + dummyImageView.contentMode = .scaleAspectFit |
| 97 | + dummyImageView.frame = UIScreen.main.bounds |
| 98 | + controller.view.alpha = 1.0 |
| 99 | + }) { finished in |
| 100 | + dummyImageView.removeFromSuperview() |
| 101 | + completed(finished) |
| 102 | + } |
| 103 | + } |
| 104 | + |
| 105 | + private func dismissAnimation( |
| 106 | + transitionView:UIView, |
| 107 | + controller: UIViewController, |
| 108 | + duration:TimeInterval, |
| 109 | + completed: @escaping((Bool) -> Void)) { |
| 110 | + |
| 111 | + guard |
| 112 | + let transitionVC = controller as? ImageViewerTransitionViewControllerConvertible |
| 113 | + else { return } |
| 114 | + |
| 115 | + let sourceView = transitionVC.sourceView |
| 116 | + let targetView = transitionVC.targetView |
| 117 | + |
| 118 | + let dummyImageView = createDummyImageView( |
| 119 | + frame: targetView?.frameRelativeToWindow() ?? UIScreen.main.bounds, |
| 120 | + image: targetView?.image) |
| 121 | + transitionView.addSubview(dummyImageView) |
| 122 | + targetView?.isHidden = true |
| 123 | + |
| 124 | + controller.view.alpha = 1.0 |
| 125 | + UIView.animate(withDuration: duration, animations: { |
| 126 | + if let sourceView = sourceView { |
| 127 | + // return to original position |
| 128 | + dummyImageView.frame = sourceView.frameRelativeToWindow() |
| 129 | + } else { |
| 130 | + // just disappear |
| 131 | + dummyImageView.alpha = 0.0 |
| 132 | + } |
| 133 | + controller.view.alpha = 0.0 |
| 134 | + }) { finished in |
| 135 | + sourceView?.alpha = 1.0 |
| 136 | + controller.view.removeFromSuperview() |
| 137 | + completed(finished) |
| 138 | + } |
| 139 | + } |
| 140 | +} |
| 141 | + |
| 142 | +final class ImageViewerTransitionPresentationController: UIPresentationController { |
| 143 | + |
| 144 | + override var frameOfPresentedViewInContainerView: CGRect { |
| 145 | + var frame: CGRect = .zero |
| 146 | + frame.size = size(forChildContentContainer: presentedViewController, |
| 147 | + withParentContainerSize: containerView!.bounds.size) |
| 148 | + return frame |
| 149 | + } |
| 150 | + |
| 151 | + override func containerViewWillLayoutSubviews() { |
| 152 | + presentedView?.frame = frameOfPresentedViewInContainerView |
| 153 | + } |
| 154 | +} |
| 155 | + |
| 156 | +final class ImageViewerTransitionPresentationManager: NSObject { |
| 157 | + |
| 158 | +} |
| 159 | + |
| 160 | +// MARK: - UIViewControllerTransitioningDelegate |
| 161 | +extension ImageViewerTransitionPresentationManager: UIViewControllerTransitioningDelegate { |
| 162 | + func presentationController( |
| 163 | + forPresented presented: UIViewController, |
| 164 | + presenting: UIViewController?, |
| 165 | + source: UIViewController |
| 166 | + ) -> UIPresentationController? { |
| 167 | + let presentationController = ImageViewerTransitionPresentationController( |
| 168 | + presentedViewController: presented, |
| 169 | + presenting: presenting) |
| 170 | + return presentationController |
| 171 | + } |
| 172 | + |
| 173 | + func animationController( |
| 174 | + forPresented presented: UIViewController, |
| 175 | + presenting: UIViewController, |
| 176 | + source: UIViewController |
| 177 | + ) -> UIViewControllerAnimatedTransitioning? { |
| 178 | + |
| 179 | + return ImageViewerTransitionPresentationAnimator(isPresenting: true) |
| 180 | + } |
| 181 | + |
| 182 | + func animationController( |
| 183 | + forDismissed dismissed: UIViewController |
| 184 | + ) -> UIViewControllerAnimatedTransitioning? { |
| 185 | + return ImageViewerTransitionPresentationAnimator(isPresenting: false) |
| 186 | + } |
| 187 | +} |
| 188 | + |
| 189 | +// MARK: - UIAdaptivePresentationControllerDelegate |
| 190 | +extension ImageViewerTransitionPresentationManager: UIAdaptivePresentationControllerDelegate { |
| 191 | + |
| 192 | + func adaptivePresentationStyle( |
| 193 | + for controller: UIPresentationController, |
| 194 | + traitCollection: UITraitCollection |
| 195 | + ) -> UIModalPresentationStyle { |
| 196 | + return .none |
| 197 | + } |
| 198 | + |
| 199 | + func presentationController( |
| 200 | + _ controller: UIPresentationController, |
| 201 | + viewControllerForAdaptivePresentationStyle style: UIModalPresentationStyle |
| 202 | + ) -> UIViewController? { |
| 203 | + return nil |
| 204 | + } |
| 205 | +} |
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