[英]How do I keep the source view controller from disappearing after a push segue?
最右邊的三個視圖控制器的背景視圖是UIVisualEffectViews,通過它們應該可以看到源視圖控制器。 像這樣將它們添加到各種viewDidLoad()
:
let blurEffect = UIBlurEffect(style: .dark)
let blurEffectView = UIVisualEffectView(effect: blurEffect)
blurEffectView.frame = self.view.bounds
blurEffectView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
self.tableView.backgroundView = blurEffectView
現在,可以通過設置視圖控制器看到主視圖控制器(“垃圾日”),但是只要兩個最右邊的VC之一完全顯示在屏幕上,設置VC就會消失。 這是一個屏幕錄像:
(請忽略小故障,我用來上傳此視頻的應用顯然破壞了視頻)
從技術上講,Show segue沒有“ Over Current Context”的問題,因此,我不應該指望源VC不會消失,但是必須有一種方法可以在沒有自定義segue的情況下進行這項工作。
我建議您在視圖控制器之間創建一個自定義過渡。
我剛剛編寫並測試了該課程:
class AnimationController: NSObject, UIViewControllerAnimatedTransitioning
{
var pushing = true
func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
return 0.3
}
func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
let duration = transitionDuration(using: transitionContext)
let toVc = transitionContext.viewController(forKey: .to)!
let toView = transitionContext.view(forKey: .to)!
let fromView = transitionContext.view(forKey: .from)!
let container = transitionContext.containerView
if pushing {
container.addSubview(fromView)
container.addSubview(toView)
}
var finalFrame = transitionContext.finalFrame(for: toVc)
if pushing {
finalFrame.origin.x = finalFrame.width
toView.frame = finalFrame
finalFrame.origin.x = 0
} else {
finalFrame.origin.x = finalFrame.width
}
UIView.animate(withDuration: duration, delay: 0, options: .curveEaseOut, animations: {
if self.pushing {
toView.frame = finalFrame
} else {
fromView.frame = finalFrame
}
}) { (_) in
transitionContext.completeTransition(true)
if self.pushing {
container.insertSubview(fromView, belowSubview: toView)
} else {
fromView.removeFromSuperview()
}
}
}
}
在您的UINavigationController
類中,執行以下操作:
class NavigationController: UINavigationController {
let animationController = AnimationController()
override func viewDidLoad() {
super.viewDidLoad()
delegate = self
}
}
和這個擴展名:
extension NavigationController: UINavigationControllerDelegate
{
func navigationController(_ navigationController: UINavigationController, animationControllerFor operation: UINavigationControllerOperation, from fromVC: UIViewController, to toVC: UIViewController) -> UIViewControllerAnimatedTransitioning? {
animationController.pushing = operation == .push
return animationController
}
}
但是,這會使您失去交互式的關閉手勢(從屏幕左側滑動以關閉),因此您需要自己進行修復。
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