Ich habe viele verwandte Themen zu SO (und anderswo) gefunden, konnte aber immer noch keine Lösung für mein Problem finden. Ich möchte eine benutzerdefinierte Warnung in meiner Ansicht mit UIViewControllerTransitioningDelegate
anzeigen. So zuerst, in meinen ersten View-Controller, hier ist der Ruf:UIViewControllerAnimatedTransitioning: Bildschirm wird immer schwarz unter benutzerdefinierte Ansicht
@IBAction func tappedButton(_ sender: Any) {
MyAlertViewController.presentIn(viewController: self)
}
Und hier der Code von MyAlertViewController
:
import UIKit
open class MyAlertViewController: UIViewController, UIViewControllerTransitioningDelegate {
@IBOutlet weak var overlayView: UIView?
@IBOutlet weak var alertView: UIView?
@IBOutlet weak var alertCenterYConstraint: NSLayoutConstraint?
public override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
super.init(nibName: "MyAlertView", bundle: nil)
self.transitioningDelegate = self
}
required public init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
static func presentIn(viewController: UIViewController) {
let alertViewController = MyAlertViewController()
if Thread.isMainThread {
viewController.present(alertViewController, animated: true, completion: nil)
} else {
DispatchQueue.main.async {
viewController.present(alertViewController, animated: true, completion: nil)
}
}
}
public func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
return MyDismissAlertViewAnimationController()
}
public func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
return MyPresentAlertViewAnimationController()
}
}
class MyPresentAlertViewAnimationController: NSObject, UIViewControllerAnimatedTransitioning {
public func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
return 0.3
}
public func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
let toViewController: MyAlertViewController = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.to) as! MyAlertViewController
let duration = self.transitionDuration(using: transitionContext)
let containerView = transitionContext.containerView
toViewController.view.frame = containerView.frame
containerView.addSubview(toViewController.view)
toViewController.overlayView?.alpha = 0.0
UIView.animate(withDuration: duration, animations: {
toViewController.overlayView?.alpha = 0.6
})
let finishFrame = toViewController.alertView?.frame
var startingFrame = finishFrame
startingFrame?.origin.y = -((finishFrame?.height)!)
toViewController.alertView?.frame = startingFrame!
UIView.animate(withDuration: 0.5, delay: 0.0, usingSpringWithDamping: 0.7, initialSpringVelocity: 1.0, options: .layoutSubviews, animations: {
toViewController.alertView?.frame = finishFrame!
}, completion: { result in
transitionContext.completeTransition(result)
})
}
}
class MyDismissAlertViewAnimationController: NSObject, UIViewControllerAnimatedTransitioning {
public func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
return 0.3
}
public func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
let fromViewController: MyAlertViewController = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.from) as! MyAlertViewController
let duration = self.transitionDuration(using: transitionContext)
UIView.animate(withDuration: duration, animations: {
fromViewController.overlayView?.alpha = 0.0
})
var finishFrame = fromViewController.alertView?.frame
finishFrame?.origin.y = -(finishFrame?.height)!
finishFrame?.origin.y = fromViewController.isDismissingByBottom ? fromViewController.view.frame.size.height : -(finishFrame?.height)!
UIView.animate(withDuration: duration, delay: 0.0, usingSpringWithDamping: 1.0, initialSpringVelocity: 1.0, options: .layoutSubviews, animations: {
fromViewController.alertView?.frame = finishFrame!
}, completion: { result in
transitionContext.completeTransition(true)
})
}
}
Die Animation funktioniert gut, der schwarze Bildschirm erscheint nur nach dem Aufruf von completeTransition()
wie Sie unten sehen können:
Danke für Ihre Hilfe ...
Vielen Dank! Das Hinzufügen von 'alertViewController.modalPresentationStyle = .overCurrentContext' in der Funktion' presentIn() 'löste das Problem. – Rob