iOS - 卡片翻转动画

Question

我有两个 UIImageViews。一个是“前”，一个是“后”。 我正在尝试实现它，以便当您单击“返回”时，它会触发动画并翻转卡片。

动画效果很好。但它使整页动画，这是我不想要的。我只希望UIImageView 翻转。我看不出我做错了什么。可能是显而易见的。

@IBOutlet weak var answerImageViewer: UIImageView?
@IBOutlet weak var backAnswerImageViewer: UIImageView?

override func viewDidLoad() {
    super.viewDidLoad()
    startNewGame()
    retrieveNewQuestion()
    setupBannerMessage()
    customPlayButtons()

    let tapGesture = UITapGestureRecognizer(target: self, action: Selector("tap"))
    tapGesture.numberOfTapsRequired = 1
    backAnswerImageViewer?.addGestureRecognizer(tapGesture)
    backAnswerImageViewer?.userInteractionEnabled = true
}

var showingBack = true

func tap (){
    if showingBack{
       UIView.transitionFromView(self.backAnswerImageViewer!, toView: self.answerImageViewer!, duration: 1, options: UIViewAnimationOptions.TransitionFlipFromRight, completion: nil)

        backAnswerImageViewer?.hidden = true
        answerImageViewer?.hidden = false

        showingBack = false
    }
    else {
        showingBack = true

        UIView.transitionFromView(self.answerImageViewer!, toView: self.backAnswerImageViewer!, duration: 1, options: UIViewAnimationOptions.TransitionFlipFromRight, completion: nil)

        backAnswerImageViewer?.hidden = false
        answerImageViewer?.hidden = true
    }
}

Answer 1

如果您有一个将“card”作为变量的button，并且您想将他的图像更改为一个名为“1”的新图像。您所要做的就是：

let image = UIImage(named: "1")
card.setImage(image, for: .normal)
UIView.transition(with: card, duration: 2, options: .transitionFlipFromRight, animations: nil, completion: nil)

Answer 2

您的问题是您的 UIImageViews 直接在“整页”视图上。

transitionFromView 从其父视图中移除 fromView 并在具有给定动画的父视图上添加 toView。因此，它为超级视图设置了动画。

您应该包含一个作为容器服务的 UIView，并将两个 imageViews 作为子视图。在容器视图上添加您的点击手势。此外，你不应该对 imageViews 有弱引用，因为一旦你完成了一次动画，你对后面的 imageView 的引用就会消失。将这些添加到代码中可能比故事板更好。无需隐藏 imageViews。

下面是一些示例代码：

class MyViewController: UIViewController {

        @IBOutlet weak var containerView: UIView!

        private let backImageView: UIImageView! = UIImageView(image: UIImage(named: "back"))
        private let frontImageView: UIImageView! = UIImageView(image: UIImage(named: "front"))

        private var showingBack = false

        override func viewDidLoad() {
            super.viewDidLoad()

            frontImageView.contentMode = .ScaleAspectFit
            backImageView.contentMode = .ScaleAspectFit

            containerView.addSubview(frontImageView)
            frontImageView.translatesAutoresizingMaskIntoConstraints = false
            frontImageView.spanSuperview()

            let singleTap = UITapGestureRecognizer(target: self, action: #selector(flip))
            singleTap.numberOfTapsRequired = 1
            containerView.addGestureRecognizer(singleTap)
        }

        func flip() {   
            let toView = showingBack ? frontImageView : backImageView
            let fromView = showingBack ? backImageView : frontImageView
            UIView.transitionFromView(fromView, toView: toView, duration: 1, options: .TransitionFlipFromRight, completion: nil)
            toView.translatesAutoresizingMaskIntoConstraints = false
            toView.spanSuperview()
            showingBack = !showingBack
        }   

    }

Answer 3

这个解决方案是用于翻转“一张卡片”，使用两个UIImageView（就像你正在使用...），我在 UICollectionView 中使用它，那当然不是必须的。

class CardCVCell: UICollectionViewCell {
    @IBOutlet weak var cardFrontImageView: UIImageView!
    @IBOutlet weak var cardBackImageView: UIImageView!

    private var flipped: Bool = false {
        didSet {
            cardFrontImageView.visible = flipped
            cardBackImageView.hidden = flipped
        }
    }

    override func awakeFromNib() {
        super.awakeFromNib()
        cardBackImageView.backgroundColor = UIColor.brownColor()
    }

    override func prepareForReuse() {
        super.prepareForReuse()
        cardFrontImageView.image = nil
        flipped = false
    }

    func flipCard(cardModel: Card) {
        let flipped = cardModel.flipped
        let fromView = flipped ? cardFrontImageView : cardBackImageView
        let toView = flipped ? cardBackImageView : cardFrontImageView
        let flipDirection: UIViewAnimationOptions = flipped ? .TransitionFlipFromRight : .TransitionFlipFromLeft
        let options: UIViewAnimationOptions = [flipDirection, .ShowHideTransitionViews]
        UIView.transitionFromView(fromView, toView: toView, duration: 0.6, options: options) {
            finished in
            cardModel.flipped = !flipped
        }
    }
}

代码取自我的open source project introducing people to Swift development, called SwiftIntro，这是一个记忆游戏，从 Instagram 获取图像。

请注意模型 Card 必须是类而不是值类型

Answer 4

您需要有一个容器视图。将answerImageViewer 和backAnswerImageViewer 放入一个UIView。这是我的示例代码。

    let frontView = UIView()
    let backView = UIView()

    let frame = CGRect(x: 40, y: 100, width: 300, height: 400)
    frontView.backgroundColor = .red
    backView.backgroundColor = .blue

    frontView.frame = CGRect(x: 0, y: 0, width: 300, height: 400)
    backView.frame = CGRect(x: 0, y: 0, width: 300, height: 400)

    let containerView = UIView()
    containerView.frame = frame

    containerView.addSubview(backView)
    containerView.addSubview(frontView)

    view.addSubview(containerView)

Answer 5

根据Pankaj的回答，

在 iOS 12 中，UIView.transition 方法的使用有点被弃用了。

在 iOS 12 设备中，虽然我已经将代码从 Swift 4.0 更新到 Swift 4.2，但我遇到了翻牌问题。

您可能会错过这个，因为；不知何故，Xcode 不建议改变这一点。当我尝试重写 UIView.transition 方法时，我意识到了这一点（感谢 Intellisense）。

之前：

UIView.transition(with: cardView, duration: 1.0, options: transitionOptions, animations: {
        self.cardView.isHidden = true
        self.downButtonForBackCard.alpha = 1
    })

    UIView.transition(with: backCardView, duration: 1.0, options: transitionOptions, animations: {
        self.backCardView.isHidden = false
    })

之后：

 UIView.transition(with: cardView, duration: 1.0, options: transitionOptions, animations: {
        self.downButtonForBackCard.alpha = 1

    }) { (finish) in
        self.cardView.isHidden = true
    }

    UIView.transition(with: backCardView, duration: 1.0, options: transitionOptions, animations: {
        self.backCardView.isHidden = false
    }) { (finish) in

    }

PS：这两个代码都来自我的案例。请勿复制粘贴，仅举个例子。

我希望我能拯救别人的生命。

Answer 6

对于 Swift 4

最好使用 UIButton 而不是 UIImageView！

var isBackImageOpen = false

if isBackImageOpen {
isBackImageOpen = false
let image = UIImage(named: "backImage")
myBtn.setImage(image, for: .normal)
UIView.transition(with: myBtn, duration: 0.3, options: .transitionFlipFromLeft, animations: nil, completion: nil)

} else {

isBackImageOpen = true
let image = UIImage(named: "frontImage")
myBtn.setImage(image, for: .normal)
UIView.transition(with: myBtn, duration: 0.3, options: .transitionFlipFromRight, animations: nil, completion: nil)
}

希望这个答案有帮助:)！

Answer 7

您可以使用此代码

UIView.transition(with: self.yourViewName, duration: 0.5, options: [.transitionFlipFromRight], animations: nil, completion: nil)

Answer 8

试试这个扩展可能很容易使用

extension UIView{

    func showFlip(){
            if self.isHidden{
                UIView.transition(with: self, duration: 1, options: [.transitionFlipFromRight,.allowUserInteraction], animations: nil, completion: nil)
                self.isHidden = false
            }

        }
    func hideFlip(){
        if !self.isHidden{
            UIView.transition(with: self, duration: 1, options: [.transitionFlipFromLeft,.allowUserInteraction], animations: nil,  completion: nil)
            self.isHidden = true
        }
    }
}

在点击操作中使用它

func Flip(){
        if second_view.isHidden == true{
            second_view.showFlip()
            first_view.hideFlip()
        }else if first_view.isHidden == true{
            second_view.hideFlip()
            first_view.showFlip()
        }
}

Answer 9

之前的答案很好，但添加了“showHideTransitionViews”作为选项，它允许您不必手动隐藏并显示动画视图。请记住，这两个视图需要在另一个视图中。此过渡将旋转超级视图。

  UIView.transition(from: view1, to: view2, duration: 0.5, options: [.transitionFlipFromLeft, .showHideTransitionViews], completion: nil)