Question

我有一个简单的示例项目，其中我正在玩一些视图控制器自定义动画，以集成到一个更大的项目中，但我发现它们存在一些问题。

我有2个简单的视图控制器，第一个带有一个按钮来呈现第二个，具有自定义动画;第二个有一些标签和一个关闭按钮，可以将视图控制器设置为“场景”

当我呈现视图控制器时，在我单击当前按钮后，所呈现的视图控制器的子视图在视图控制器动画显示之前出现在屏幕上，但是当我解除VC时，所有子视图和被解雇的视图控制器一起去。

在我的视图控制器2上（显示）我有默认自动布局的视图（重置为建议的约束）

我无法找到理由为什么子视图没有像我预期的那样在视图控制器中设置动画。

下面是一个显示正在发生的事情的gif，以及源代码：

代码：查看控制器1（显示VC）

导入UIKit

类ViewController：UIViewController，UIViewControllerTransitioningDelegate {

var animator = Animator()


override func viewDidLoad() {
    super.viewDidLoad()
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


@IBAction func presentButton(_ sender: Any) {
    let storyboard = UIStoryboard(name: "Main", bundle: nil);
    let vc = storyboard.instantiateViewController(withIdentifier: "vc2") as! ViewController2

    vc.transitioningDelegate = self
    vc.modalPresentationStyle = .custom // chama as funções à parte

    present(vc, animated: true, completion: nil)
}




func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
    animator.transitioningMode = .Present // sabe que está em presenting mode
    return animator
}

func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
    animator.transitioningMode = .Dismiss // Sabe que está em dismissing mode
    return animator
}

func presentationController(forPresented presented: UIViewController, presenting: UIViewController?, source: UIViewController) -> UIPresentationController? {
    return CustomPresentationController(presentedViewController: presented, presenting: presenting)
}




}

代码：查看控制器2（显示VC）

导入UIKit

类ViewController2：UIViewController {

override func viewDidLoad() {
    super.viewDidLoad()
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
}



@IBAction func dismissButton(_ sender: Any) {
    dismiss(animated: true, completion: nil)
}

}

代码：CustomPresentationController

import UIKit

导入基金会

class CustomPresentationController：UIPresentationController {

override init(presentedViewController: UIViewController, presenting presentingViewController: UIViewController!) {
    super.init(presentedViewController: presentedViewController, presenting: presentingViewController)
}


override var frameOfPresentedViewInContainerView: CGRect {

    // arranca a 0
    var presentedViewFrame = CGRect.zero

    // Calcula os bounds do container
    let containerBounds = self.containerView?.bounds

    // Recalcula o size
    presentedViewFrame.size = CGSize(width: (containerBounds?.size.width)! , height: ((containerBounds?.size.height)! * 0.90))

    presentedViewFrame.origin.x = 0
    presentedViewFrame.origin.y = (containerBounds?.size.height)! * 0.1

    return presentedViewFrame
}


}

代码：Animator类

导入基金会导入UIKit

类Animator：NSObject，UIViewControllerAnimatedTransitioning {

enum Status {
    case Present
    case Dismiss
}
var transitioningMode: Status = .Present
var presentDuration = 1.0
var dismissDuration = 0.3


// Tempo da animação
func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
    if (transitioningMode == .Present) {
        return presentDuration
    } else {
        return dismissDuration
    }
}



func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {

    // Get the set of relevant objects.
    let containerView = transitionContext.containerView

    guard
        let fromVC = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.from),
        let toVC = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.to)
        else {
            print("Returning animateTransition VC")
            return
    }

    let toView = transitionContext.view(forKey: UITransitionContextViewKey.to)
    let fromView = transitionContext.view(forKey: UITransitionContextViewKey.from)



    // Set up some variables for the animation.
    let containerFrame:     CGRect = containerView.frame
    var toViewStartFrame:   CGRect = transitionContext.initialFrame(for: toVC)
    let toViewFinalFrame:   CGRect = transitionContext.finalFrame(for: toVC)
    var fromViewFinalFrame: CGRect = transitionContext.finalFrame(for: fromVC)

    // Set up animation parameters.
    if (transitioningMode == .Present) {
        // Modify the frame of the presented view so that it starts
        // offscreen at the lower-right corner of the container.
        toViewStartFrame.origin.x = 0//containerFrame.size.width
        toViewStartFrame.origin.y = containerFrame.size.height * 0.1


    } else {
        // Modify the frame of the dismissed view so it ends in
        // the lower-right corner of the container view.
        fromViewFinalFrame = CGRect(x: containerFrame.size.width,
                                    y: containerFrame.size.height,
                                    width: (toVC.view.frame.size.width),
                                    height: (toVC.view.frame.size.height))



    }

    if (transitioningMode == .Present) {
        // Always add the "to" view to the container.
        // And it doesn't hurt to set its start frame.
        containerView.addSubview(toView!)
        toView?.frame = toViewStartFrame
    }

    // Animate using the animator's own duration value.
    UIView.animate(withDuration: presentDuration, animations: {

        if (self.transitioningMode == .Present) {
            // Move the presented view into position.
            toView?.frame = toViewFinalFrame
        }
        else {
            // Move the dismissed view offscreen.
            fromView?.frame = fromViewFinalFrame
        }
    }) { (finished) in
        let success = !(transitionContext.transitionWasCancelled)
        // After a failed presentation or successful dismissal, remove the view.
        if ((self.transitioningMode == .Present && !success) || (self.transitioningMode == .Dismiss && success)) {
            toView?.removeFromSuperview()
        }

        // Notify UIKit that the transition has finished
        transitionContext.completeTransition(success)

    }

}



}

Answer 1

好吧，我会帮助你。首先，它不工作的原因是autolayout已经定位你的视图，但你有一个大小为零的框架。为了向您显示此问题，请转到相关控制器，并将其剪切为子视图，并且在转换期间不会显示。现在我可能不会更改框架来移动它，因为你只想将其滑入，你可能可以摆脱一些代码。这是我的样子。

import UIKit

class ViewController: UIViewController,UIViewControllerTransitioningDelegate {

    var animator = Animator()

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    @IBAction func presentModally(_ sender: Any) {
        self.performSegue(withIdentifier: "modal", sender: nil)
    }

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "modal"{
           let dvc = segue.destination
            dvc.transitioningDelegate = self
            dvc.modalPresentationStyle = .overCurrentContext
        }
    }

    func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        animator.transitioningMode = .Present // sabe que está em presenting mode
        return animator
    }

    func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        animator.transitioningMode = .Dismiss // Sabe que está em dismissing mode
        return animator
    }

}

删除自定义演示控制器。老实说，我认为不需要它。

现在是动画师。

import UIKit

class Animator: NSObject,UIViewControllerAnimatedTransitioning {
    enum Status {
        case Present
        case Dismiss
    }
    var transitioningMode: Status = .Present
    var presentDuration = 1.0
    var dismissDuration = 0.3


    // Tempo da animação
    func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
        if (transitioningMode == .Present) {
            return presentDuration
        } else {
            return dismissDuration
        }
    }


    func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {

        // Get the set of relevant objects.
        let containerView = transitionContext.containerView

        guard
            let fromVC = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.from),
            let toVC = transitionContext.viewController(forKey: UITransitionContextViewControllerKey.to)
            else {
                print("Returning animateTransition VC")
                return
        }

        let toView = transitionContext.view(forKey: UITransitionContextViewKey.to)
        let fromView = transitionContext.view(forKey: UITransitionContextViewKey.from)

        // Set up some variables for the animation.
        let containerFrame:     CGRect = containerView.frame
        let toViewFinalFrame:   CGRect = transitionContext.finalFrame(for: toVC)
        var fromViewFinalFrame: CGRect = transitionContext.finalFrame(for: fromVC)

        // Set up animation parameters.
        if (transitioningMode == .Present) {
            let anchor = toViewFinalFrame.origin
            toView?.layer.anchorPoint = anchor
            toView?.layer.position = anchor
            toView?.transform = CGAffineTransform(scaleX: 0, y: 1)
            //another posibility
            //toView?.transform = CGAffineTransform(translationX: -containerView.bounds.width, y: -containerView.bounds.height)
        } else {
            // Modify the frame of the dismissed view so it ends in
            // the lower-right corner of the container view.
            fromViewFinalFrame = CGRect(x: containerFrame.size.width,
                                        y: containerFrame.size.height,
                                        width: (toVC.view.frame.size.width),
                                        height: (toVC.view.frame.size.height))
        }

        if (transitioningMode == .Present) {
            // Always add the "to" view to the container.
            // And it doesn't hurt to set its start frame.
            containerView.addSubview(toView!)
           // toView?.frame = toViewStartFrame
        }

        // Animate using the animator's own duration value.
        UIView.animate(withDuration: presentDuration, animations: {

            if (self.transitioningMode == .Present) {
                // Move the presented view into position.
                toView?.transform = .identity
            }
            else {
                // Move the dismissed view offscreen.
                fromView?.frame = fromViewFinalFrame
            }
        }) { (finished) in
            let success = !(transitionContext.transitionWasCancelled)
            // After a failed presentation or successful dismissal, remove the view.
            if ((self.transitioningMode == .Present && !success) || (self.transitioningMode == .Dismiss && success)) {
                toView?.removeFromSuperview()
            }

            // Notify UIKit that the transition has finished
            transitionContext.completeTransition(success)

        }

    }

}

这就是你所需要的一切。干杯。

我的子视图没有使用视图控制器

1 个答案: