Question

我正在关注这个真棒video为我的项目创建一个自定义过渡，因为我正在为iPad开发，所以我没有全屏显示目标视图控制器，我希望它占用一半像这样的屏幕：

自定义转换类的代码是：

class CircularTransition: NSObject {

var circle = UIView()
var startingPoint = CGPoint.zero {
    didSet {
        circle.center = startingPoint
    }
}
var circleColor = UIColor.white
var duration = 0.4

enum circularTransitionMode: Int {
    case present, dismiss
}
var transitionMode = circularTransitionMode.present    
}

extension CircularTransition: UIViewControllerAnimatedTransitioning {

func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
    return duration
}

func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
    let containerView = transitionContext.containerView
    if transitionMode == .present {
        if let presentedView = transitionContext.view(forKey: UITransitionContextViewKey.to) {

            var viewCenter = presentedView.center
            var viewSize = presentedView.frame.size


            if UIDevice.current.userInterfaceIdiom == .pad {
                viewCenter = CGPoint(x: viewCenter.x, y: viewSize.height)
                viewSize = CGSize(width: viewSize.width, height: viewSize.height)
            }

            circle = UIView()
            circle.frame = frameForCircle(withViewCenter: viewCenter, size: viewSize, startPoint: startingPoint)
            circle.layer.cornerRadius = circle.frame.size.width / 2
            circle.center = startingPoint
            circle.backgroundColor = circleColor
            circle.transform = CGAffineTransform(scaleX: 0.001, y: 0.001)
            containerView.addSubview(circle)

            presentedView.center = startingPoint
            presentedView.transform = CGAffineTransform(scaleX: 0.001, y: 0.001)
            presentedView.alpha = 0
            containerView.addSubview(presentedView)

            UIView.animate(withDuration: duration, animations: {
                self.circle.transform = CGAffineTransform.identity
                presentedView.transform = CGAffineTransform.identity
                presentedView.alpha = 1
                presentedView.center = viewCenter
                }, completion: {(sucess: Bool) in transitionContext.completeTransition(sucess)})
        }
    } else {
        if let returningView = transitionContext.view(forKey: UITransitionContextViewKey.from) {
            let viewCenter = returningView.center
            let viewSize = returningView.frame.size

            circle.frame = frameForCircle(withViewCenter: viewCenter, size: viewSize, startPoint: startingPoint)
            circle.layer.cornerRadius = circle.frame.size.width / 2
            circle.center = startingPoint

            UIView.animate(withDuration: duration + 0.1, animations: {
                self.circle.transform = CGAffineTransform(scaleX: 0.001, y: 0.001)
                returningView.transform = CGAffineTransform(scaleX: 0.001, y: 0.001)
                returningView.center = self.startingPoint
                returningView.alpha = 0
                }, completion: {(success: Bool) in
                    returningView.center = viewCenter
                    returningView.removeFromSuperview()
                    self.circle.removeFromSuperview()
                    transitionContext.completeTransition(success)
            })
        }
    }
}

func frameForCircle(withViewCenter viewCenter: CGPoint, size viewSize: CGSize, startPoint: CGPoint) -> CGRect {

    let xLength = fmax(startingPoint.x, viewSize.width - startingPoint.x)
    let yLength = fmax(startingPoint.y, viewSize.height - startingPoint.y)
    let offsetVector = sqrt(xLength * xLength + yLength * yLength) * 2
    let size = CGSize(width: offsetVector, height: offsetVector)

    return CGRect(origin: CGPoint.zero, size: size)

}
}

我视图控制器中的代码部分：

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    let secondVC = segue.destination as! ResultViewController
    secondVC.transitioningDelegate = self
    secondVC.modalPresentationStyle = .custom
}

// MARK: - Animation

func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {

    transtion.transitionMode = .dismiss
    transtion.startingPoint = calculateButton.center
    transtion.circleColor = calculateButton.backgroundColor!
    return transtion
}

func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {

    transtion.transitionMode = .present
    transtion.startingPoint = calculateButton.center
    transtion.circleColor = calculateButton.backgroundColor!
    return transtion
}

但是控制器会全屏显示。

Answer 1

您可以尝试两个不同的容器视图，用于顶部和底部的一半。然后给它动画......

Answer 2

感谢大家的建议，我尝试使用容器视图，这是我如何做到的：

首先我在containerView课程中添加了CircularTransition媒体资源：

class CircularTransition: NSObject {
    ...

    var containerView: UIView
    init(containerView: UIView) {
        self.containerView = containerView
    }

    ...    
}

然后在其扩展程序中注释掉这些代码：

// let containerView = transitionContext.containerView

// if UIDevice.current.userInterfaceIdiom == .pad {
//          viewCenter = CGPoint(x: viewCenter.x, y: viewSize.height)
//          viewSize = CGSize(width: viewSize.width, height: viewSize.height)
//      }

在我的mainViewController中，我添加了一种添加容器视图的方法：

func addContainerView() {

    let containerView = UIView()
    containerView.translatesAutoresizingMaskIntoConstraints = false
    view.addSubview(containerView)
    NSLayoutConstraint.activate([
        containerView.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 10),
        containerView.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -10),
        containerView.heightAnchor.constraint(equalTo: view.heightAnchor, multiplier: 0.5),
        containerView.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: -10),
        ])
    transtion.containerView = containerView
}

我不使用故事板的原因是，如果我将动画视图控制器（ResultViewController）放入容器视图中，则只要加载mainViewController就会加载它，但是，{ {1}}需要来自ResultViewController的数据，因此会崩溃。

然后我在prepareForSegue中改变了一点：

prepareForSegue

在override func prepare(for segue: UIStoryboardSegue, sender: Any?) { transtion.containerView = view if UIDevice.current.userInterfaceIdiom == .pad { addContainerView() } let secondVC = segue.destination as! ResultViewController secondVC.transitioningDelegate = self secondVC.modalPresentationStyle = .custom secondVC.dataSource = calculator!.iterateWPItems().0 }中以这种方式创建了CircularTransition课程：

mainViewController

基本上我所做的一切，我都可以展示华丽的双vc视图然而，在iPad上，回归过渡并不起作用，我还是我们还没弄明白是什么造成的。

Answer 3

所以我已经完成了我的答案，它采用了与其他答案不同的方法，所以请耐心等待。

而不是添加容器视图，我认为最好的方法是创建一个UIViewController子类（我称之为CircleDisplayViewController）。然后，所有需要具有此功能的VC都可以从它继承（而不是从UIViewController继承）。

这样，您呈现和解散ResultViewController的所有逻辑都可以在一个地方处理，并且可以在您的应用中的任何位置使用。

您的VC可以使用它的方式如下：

class AnyViewController: CircleDisplayViewController { 

    /* Only inherit from CircleDisplayViewController, 
      otherwise you inherit from UIViewController twice */

    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 showCircle(_ sender: UIButton) {

        openCircle(withCenter: sender.center, radius: nil, resultDataSource: calculator!.iterateWPItems())

        //I'll get to this stuff in just a minute

        //Edit: from talking to Bright Future in chat I saw that resultViewController needs to be setup with calculator!.iterateWPItems()

    }

}

showCircle将使用转发委托在发送UIButtons中心的圆心显示您的ResultViewController。

CircleDisplayViewController子类是这样的：

class CircleDisplayViewController: UIViewController, UIViewControllerTransitioningDelegate, ResultDelegate {

    private enum CircleState {
        case collapsed, visible
    }

    private var circleState: CircleState = .collapsed

    private var resultViewController: ResultViewController!

    private lazy var transition = CircularTransition()

    func openCircle(withCenter center: CGPoint, radius: CGFloat?, resultDataSource: ([Items], Int, String)) {

        let circleCollapsed = (circleState == .collapsed)

        DispatchQueue.main.async { () -> Void in

            if circleCollapsed {

                self.addCircle(withCenter: center, radius: radius, resultDataSource: resultDataSource)

            }

        }

    }

    private func addCircle(withCenter circleCenter: CGPoint, radius: CGFloat?, resultDataSource: ([Items], Int, String])) {

        var circleRadius: CGFloat!

        if radius == nil {
            circleRadius = view.frame.size.height/2.0
        } else {
            circleRadius = radius
        }

        //instantiate resultViewController here, and setup delegate etc.

        resultViewController = UIStoryboard.resultViewController()

        resultViewController.transitioningDelegate = self
        resultViewController.delegate = self
        resultViewController.modalPresentationStyle = .custom

        //setup any values for resultViewController here

        resultViewController.dataSource = resultDataSource

        //then set the frame of resultViewController (while also setting endFrame)

        let resultOrigin = CGPoint(x: 0.0, y: circleCenter.y - circleRadius)
        let resultSize = CGSize(width: view.frame.size.width, height: (view.frame.size.height - circleCenter.y) + circleRadius)

        resultViewController.view.frame = CGRect(origin: resultOrigin, size: resultSize)
        resultViewController.endframe = CGRect(origin: resultOrigin, size: resultSize)

        transition.circle = UIView()
        transition.startingPoint = circleCenter
        transition.radius = circleRadius

        transition.circle.frame = circleFrame(radius: transition.radius, center: transition.startingPoint)

        present(resultViewController, animated: true, completion: nil)

    }

    func collapseCircle() { //THIS IS THE RESULT DELEGATE FUNCTIONS

        dismiss(animated: true) {

            self.resultViewController = nil

        }

    }

    func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {

        transition.transitionMode = .dismiss
        transition.circleColor = UIColor.red
        return transition

    }

    func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {

        transition.transitionMode = .present
        transition.circleColor = UIColor.red
        return transition

    }

    func circleFrame(radius: CGFloat, center: CGPoint) -> CGRect {
        let circleOrigin = CGPoint(x: center.x - radius, y: center.y - radius)
        let circleSize = CGSize(width: radius*2, height: radius*2)
        return CGRect(origin: circleOrigin, size: circleSize)
    }

}

public extension UIStoryboard {
    class func mainStoryboard() -> UIStoryboard { return UIStoryboard(name: "Main", bundle: Bundle.main) }
}

private extension UIStoryboard {

    class func resultViewController() -> ResultViewController {
        return mainStoryboard().instantiateViewController(withIdentifier: "/* Your ID for ResultViewController */") as! ResultViewController
    }

}

继承自DisplayCircleViewController的VC调用的唯一函数是openCircle，openCircle有一个circleCenter参数（应该是你的按钮中心我猜测），一个可选的半径参数（如果这是nil然后是默认值为视图高度的一半，然后是设置ResultViewController所需的任何其他内容。

在addCircle函数中有一些重要的东西：

你设置了ResultViewController然而你必须在呈现之前（就像你准备segue一样），

然后为它设置框架（我试图让它成为可见的圆圈区域，但这里非常粗糙，可能值得一玩），

然后我重置过渡圆（而不是过渡类），这样我就可以在这里设置圆的起点，半径和框架。

然后只是一个正常的礼物。

如果您还没有为此设置ResultViewController的标识符（请参阅UIStoryboard扩展）

我还改变了TransitioningDelegate函数，因此你不设置圆心，这是因为为了保持它的通用性，我把这个责任放在继承自这个的ViewController上。（见代码的最高位）

最后我更改了CircularTransition类

我添加了一个变量：

var radius: CGFloat = 0.0 //set in the addCircle function above

并更改了animateTransition：

（删除注释掉的行）：

func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {

    let containerView = transitionContext.containerView

    if transitionMode == .present {
        if let presentedView = transitionContext.view(forKey: UITransitionContextViewKey.to) {

           ...

           // circle = UIView()
           // circle.frame = frameForCircle(withViewCenter: viewCenter, size: viewSize, startPoint: startingPoint)
           circle.layer.cornerRadius = radius

           ...

        }

    } else {

        if let returningView = transitionContext.view(forKey: UITransitionContextViewKey.from) {

            ...

            // circle.frame = frameForCircle(withViewCenter: viewCenter, size: viewSize, startPoint: startingPoint)

            ...

        }
    }
}

最后我制作了一个协议，以便ResultViewController可以解除圆圈

protocol ResultDelegate: class {

    func collapseCircle()

}

class ResultViewController: UIViewController {

    weak var delegate: ResultDelegate!

    var endFrame: CGRect! 

    var dataSource: ([Items], Int, String)! // same as in Bright Future's case

    override func viewDidLoad() {
        super.viewDidLoad()


    }

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

    override func viewDidLayoutSubviews() {
        if endFrame != nil {
            view.frame = endFrame
        }
    }

    @IBAction func closeResult(_ sender: UIButton) {

        delegate.collapseCircle()

    }

}

这已经证明是一个非常大的答案，对不起，我写了一下，所以如果有什么不明确的话就说。

希望这有帮助！

编辑：我发现问题，iOS 10改变了它们布局视图的方式，所以为了解决这个问题，我在ResultViewController中添加了一个endFrame属性，并将它的视图框架设置为viewDidLayoutSubviews中的视图框架。我还在addCircle中同时设置了frame和endFrame。我更改了上面的代码以反映更改。它不太理想，但我稍后会再看看是否有更好的解决方法。

编辑：这就像是对我开放的

Answer 4

您好我在您的animateTransition方法中做了一些更改尝试此操作。您可能需要使用动画的withRelativeStartTime以及框架和中心来完善动画。但我想这应该让你开始。

Uncaught (in promise): Error: Cannot match any routes. URL Segment: 'admin'

希望这有帮助。

使用动画同时显示2个视图控制器

4 个答案: