那么，直接解決問題：
我創建了一個自定義UIViewControllerTransitioningDelegate，用于將一個視圖控制器中的視圖影片化到另一個視圖控制器中的全屏。我通過創建UIViewControllerAnimatedTransitioning物件來為呈現的視圖的框架設定影片。而且效果很好！除非我嘗試在解雇期間調整擁有視圖的視圖控制器的additionalSafeAreaInsets ......
當我嘗試對視圖控制器及其視圖的解除進行影片處理時，似乎沒有考慮此屬性。它在演示期間作業正常。
下面的 gif 顯示了它的外觀。紅色框是所呈現視圖的安全區域（加上一些填充） - 我試圖在影片期間使用擁有該視圖的視圖控制器的additionalSafeAreaInsets屬性進行補償。
如 gif 所示，安全區域在演示期間進行了適當調整，但在解雇期間未進行適當調整。
所以，我想要的是：通過將additionalSafeAreaInsets設定為安全區域的“反轉”值，使用additionalSafeAreaInsets來減少影片期間安全區域的影響。以便有效安全區域從 0 開始并在演示期間“影片”到預期值，并在關閉期間從預期值開始并“影片”到 0。（我參考“影片”，因為它實際上是影片視圖的框架。但 UIKit/Auto Layout 在計算框架時使用這些屬性）
任何關于如何解決這個問題的想法都非常受歡迎！
下面提供了自定義 UIViewControllerTransitioningDelegate 的代碼。
//
// FullScreenTransitionManager.swift
//
import Foundation
import UIKit
// MARK: FullScreenPresentationController
final class FullScreenPresentationController: UIPresentationController {
private let backgroundView: UIView = {
let view = UIView()
view.backgroundColor = .systemBackground
view.alpha = 0
return view
}()
private lazy var tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(onTap))
@objc private func onTap(_ gesture: UITapGestureRecognizer) {
presentedViewController.dismiss(animated: true)
}
}
// MARK: UIPresentationController
extension FullScreenPresentationController {
override func presentationTransitionWillBegin() {
guard let containerView = containerView else { return }
containerView.addGestureRecognizer(tapGestureRecognizer)
containerView.addSubview(backgroundView)
backgroundView.frame = containerView.frame
guard let transitionCoordinator = presentingViewController.transitionCoordinator else { return }
transitionCoordinator.animate(alongsideTransition: { context in
self.backgroundView.alpha = 1
})
}
override func presentationTransitionDidEnd(_ completed: Bool) {
if !completed {
backgroundView.removeFromSuperview()
containerView?.removeGestureRecognizer(tapGestureRecognizer)
}
}
override func dismissalTransitionWillBegin() {
guard let transitionCoordinator = presentingViewController.transitionCoordinator else { return }
transitionCoordinator.animate(alongsideTransition: { context in
self.backgroundView.alpha = 0
})
}
override func dismissalTransitionDidEnd(_ completed: Bool) {
if completed {
backgroundView.removeFromSuperview()
containerView?.removeGestureRecognizer(tapGestureRecognizer)
}
}
override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
guard
let containerView = containerView,
let presentedView = presentedView
else { return }
coordinator.animate(alongsideTransition: { context in
self.backgroundView.frame = containerView.frame
presentedView.frame = self.frameOfPresentedViewInContainerView
})
}
}
// MARK: FullScreenTransitionManager
final class FullScreenTransitionManager: NSObject, UIViewControllerTransitioningDelegate {
private weak var anchorView: UIView?
init(anchorView: UIView) {
self.anchorView = anchorView
}
func presentationController(forPresented presented: UIViewController,
presenting: UIViewController?,
source: UIViewController) -> UIPresentationController? {
FullScreenPresentationController(presentedViewController: presented, presenting: presenting)
}
func animationController(forPresented presented: UIViewController,
presenting: UIViewController,
source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
let anchorFrame = anchorView?.safeAreaLayoutGuide.layoutFrame ?? CGRect(origin: presented.view.center, size: .zero)
return FullScreenAnimationController(animationType: .present,
anchorFrame: anchorFrame)
}
func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
let anchorFrame = anchorView?.safeAreaLayoutGuide.layoutFrame ?? CGRect(origin: dismissed.view.center, size: .zero)
return FullScreenAnimationController(animationType: .dismiss,
anchorFrame: anchorFrame)
}
}
// MARK: UIViewControllerAnimatedTransitioning
final class FullScreenAnimationController: NSObject, UIViewControllerAnimatedTransitioning {
enum AnimationType {
case present
case dismiss
}
private let animationType: AnimationType
private let anchorFrame: CGRect
private let animationDuration: TimeInterval
private var propertyAnimator: UIViewPropertyAnimator?
init(animationType: AnimationType, anchorFrame: CGRect, animationDuration: TimeInterval = 0.3) {
self.animationType = animationType
self.anchorFrame = anchorFrame
self.animationDuration = animationDuration
}
func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
animationDuration
}
func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
switch animationType {
case .present:
guard
let toViewController = transitionContext.viewController(forKey: .to)
else {
return transitionContext.completeTransition(false)
}
transitionContext.containerView.addSubview(toViewController.view)
propertyAnimator = presentAnimator(with: transitionContext, animating: toViewController)
case .dismiss:
guard
let fromViewController = transitionContext.viewController(forKey: .from)
else {
return transitionContext.completeTransition(false)
}
propertyAnimator = dismissAnimator(with: transitionContext, animating: fromViewController)
}
}
private func presentAnimator(with transitionContext: UIViewControllerContextTransitioning,
animating viewController: UIViewController) -> UIViewPropertyAnimator {
let finalFrame = transitionContext.finalFrame(for: viewController)
let safeAreaInsets = transitionContext.containerView.safeAreaInsets
let safeAreaCompensation = UIEdgeInsets(top: -safeAreaInsets.top,
left: -safeAreaInsets.left,
bottom: -safeAreaInsets.bottom,
right: -safeAreaInsets.right)
viewController.additionalSafeAreaInsets = safeAreaCompensation
viewController.view.frame = anchorFrame
viewController.view.setNeedsLayout()
viewController.view.layoutIfNeeded()
return UIViewPropertyAnimator.runningPropertyAnimator(withDuration: transitionDuration(using: transitionContext), delay: 0, options: [.curveEaseInOut, .layoutSubviews], animations: {
viewController.additionalSafeAreaInsets = .zero
viewController.view.frame = finalFrame
viewController.view.setNeedsLayout()
viewController.view.layoutIfNeeded()
}, completion: { _ in
transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
})
}
private func dismissAnimator(with transitionContext: UIViewControllerContextTransitioning,
animating viewController: UIViewController) -> UIViewPropertyAnimator {
let finalFrame = anchorFrame
let safeAreaInsets = transitionContext.containerView.safeAreaInsets
let safeAreaCompensation = UIEdgeInsets(top: -safeAreaInsets.top,
left: -safeAreaInsets.left,
bottom: -safeAreaInsets.bottom,
right: -safeAreaInsets.right)
viewController.view.setNeedsLayout()
viewController.view.layoutIfNeeded()
return UIViewPropertyAnimator.runningPropertyAnimator(withDuration: transitionDuration(using: transitionContext), delay: 0, options: [.curveEaseInOut, .layoutSubviews], animations: {
viewController.additionalSafeAreaInsets = safeAreaCompensation
viewController.view.frame = finalFrame
viewController.view.setNeedsLayout()
viewController.view.layoutIfNeeded()
}, completion: { _ in
transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
})
}
}
uj5u.com熱心網友回復：
經過一些除錯后，我設法找到了解決此問題的方法。
簡而言之，看起來安全區域在UIViewController.viewWillDisappear被呼叫后沒有更新，因此任何更改都.additionalSafeAreaInsets被忽略（因為這些插入修改了視圖控制器視圖的安全區域）。
我目前的解決方法有點笨拙，但它可以完成作業。由于UIViewControllerTransitioningDelegate.animationController(forDismissed...)在UIViewController.viewWillDisappearand之前被呼叫UIViewControllerAnimatedTransitioning.animateTransition(using transitionContext...)，我已經在該方法中啟動了關閉影片。這樣影片的布局計算就會正確，并設定正確的安全區域。
下面是我的自定義代碼UIViewControllerTransitioningDelegate和解決方法。注意：我已經洗掉了使用，.additionalSafeAreaInsets因為它根本沒有必要！我不知道為什么我認為我首先需要它......
//
// FullScreenTransitionManager.swift
//
import Foundation
import UIKit
// MARK: FullScreenPresentationController
final class FullScreenPresentationController: UIPresentationController {
private let backgroundView: UIView = {
let view = UIView()
view.backgroundColor = .systemBackground
view.alpha = 0
return view
}()
private lazy var tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(onTap))
@objc private func onTap(_ gesture: UITapGestureRecognizer) {
presentedViewController.dismiss(animated: true)
}
}
// MARK: UIPresentationController
extension FullScreenPresentationController {
override func presentationTransitionWillBegin() {
guard let containerView = containerView else { return }
containerView.addGestureRecognizer(tapGestureRecognizer)
containerView.addSubview(backgroundView)
backgroundView.frame = containerView.frame
guard let transitionCoordinator = presentingViewController.transitionCoordinator else { return }
transitionCoordinator.animate(alongsideTransition: { context in
self.backgroundView.alpha = 1
})
}
override func presentationTransitionDidEnd(_ completed: Bool) {
if !completed {
backgroundView.removeFromSuperview()
containerView?.removeGestureRecognizer(tapGestureRecognizer)
}
}
override func dismissalTransitionWillBegin() {
guard let transitionCoordinator = presentingViewController.transitionCoordinator else { return }
transitionCoordinator.animate(alongsideTransition: { context in
self.backgroundView.alpha = 0
})
}
override func dismissalTransitionDidEnd(_ completed: Bool) {
if completed {
backgroundView.removeFromSuperview()
containerView?.removeGestureRecognizer(tapGestureRecognizer)
}
}
override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
guard let containerView = containerView else { return }
coordinator.animate(alongsideTransition: { context in
self.backgroundView.frame = containerView.frame
})
}
}
// MARK: FullScreenTransitionManager
final class FullScreenTransitionManager: NSObject, UIViewControllerTransitioningDelegate {
fileprivate enum AnimationState {
case present
case dismiss
}
private weak var anchorView: UIView?
private var animationState: AnimationState = .present
private var animationDuration: TimeInterval = Resources.animation.duration
private var anchorViewFrame: CGRect = .zero
private var propertyAnimator: UIViewPropertyAnimator?
init(anchorView: UIView) {
self.anchorView = anchorView
}
func presentationController(forPresented presented: UIViewController,
presenting: UIViewController?,
source: UIViewController) -> UIPresentationController? {
FullScreenPresentationController(presentedViewController: presented, presenting: presenting)
}
func animationController(forPresented presented: UIViewController,
presenting: UIViewController,
source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
prepare(animationState: .present)
}
func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
// Starting the animation here, since UIKit do not update safe area insets after UIViewController.viewWillDisappear() is called
defer {
propertyAnimator = dismissAnimator(animating: dismissed)
}
return prepare(animationState: .dismiss)
}
}
// MARK: UIViewControllerAnimatedTransitioning
extension FullScreenTransitionManager: UIViewControllerAnimatedTransitioning {
private func prepare(animationState: AnimationState,
animationDuration: TimeInterval = Resources.animation.duration) -> UIViewControllerAnimatedTransitioning? {
guard let anchorView = anchorView else { return nil }
self.animationState = animationState
self.animationDuration = animationDuration
self.anchorViewFrame = anchorView.safeAreaLayoutGuide.layoutFrame
return self
}
func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
animationDuration
}
func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
switch animationState {
case .present:
guard
let toViewController = transitionContext.viewController(forKey: .to)
else {
return transitionContext.completeTransition(false)
}
propertyAnimator = presentAnimator(with: transitionContext, animating: toViewController)
case .dismiss:
guard
let fromViewController = transitionContext.viewController(forKey: .from)
else {
return transitionContext.completeTransition(false)
}
propertyAnimator = updatedDismissAnimator(with: transitionContext, animating: fromViewController)
}
}
private func presentAnimator(with transitionContext: UIViewControllerContextTransitioning,
animating viewController: UIViewController) -> UIViewPropertyAnimator {
transitionContext.containerView.addSubview(viewController.view)
let finalFrame = transitionContext.finalFrame(for: viewController)
viewController.view.frame = anchorViewFrame
viewController.view.layoutIfNeeded()
return UIViewPropertyAnimator.runningPropertyAnimator(withDuration: transitionDuration(using: transitionContext),
delay: 0,
options: [.curveEaseInOut],
animations: {
viewController.view.frame = finalFrame
viewController.view.layoutIfNeeded()
}, completion: { _ in
transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
})
}
private func dismissAnimator(animating viewController: UIViewController) -> UIViewPropertyAnimator {
let finalFrame = anchorViewFrame
return UIViewPropertyAnimator.runningPropertyAnimator(withDuration: animationDuration,
delay: 0,
options: [.curveEaseInOut],
animations: {
viewController.view.frame = finalFrame
viewController.view.layoutIfNeeded()
})
}
private func updatedDismissAnimator(with transitionContext: UIViewControllerContextTransitioning,
animating viewController: UIViewController) -> UIViewPropertyAnimator {
let propertyAnimator = self.propertyAnimator ?? dismissAnimator(animating: viewController)
propertyAnimator.addCompletion({ _ in
transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
})
self.propertyAnimator = propertyAnimator
return propertyAnimator
}
}
此外，這里是Stack Overflow 帖子的鏈接，該帖子關于安全區域在UIViewController.viewWillDisappear. 以及指向Apple 論壇上類似帖子的鏈接。
轉載請註明出處，本文鏈接：https://www.uj5u.com/shujuku/388674.html
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