适用于贴片式滑动屏幕的快速iOS动画

Question

我已经建立了一个屏幕非常类似于Tinder主屏幕。我已经设置了可拖动图标的边框和下一张卡从屏幕顶部被动画加载。目前有两个按钮(一个接受按钮，一个拒绝按钮)，当他们被按下卡旋转和转换出屏幕的正确方向。这个功能目前完成了这个动画..。

func rejectAnimation() {

    let scale = CGAffineTransformMakeScale(1, 1)
    let translate = CGAffineTransformMakeTranslation(0, 0)
    self.cardUIView.transform = CGAffineTransformConcat(scale, translate)

    springWithCompletion(0.75, animations: {

        let rotate = CGAffineTransformMakeRotation(CGFloat(-M_PI_2))
        let translate = CGAffineTransformMakeTranslation((-375), 0)
        self.cardUIView.transform = CGAffineTransformConcat(rotate, translate)

        }, completion: { finished in 0
            self.refreshView()
    })
}

和

func acceptAnimation() {

    let scale = CGAffineTransformMakeScale(1, 1)
    let translate = CGAffineTransformMakeTranslation(0, 0)
    self.cardUIView.transform = CGAffineTransformConcat(scale, translate)

    springWithCompletion(0.75, animations: {

        let rotate = CGAffineTransformMakeRotation(CGFloat(M_PI_2))
        let translate = CGAffineTransformMakeTranslation(375, 0)
        self.cardUIView.transform = CGAffineTransformConcat(rotate, translate)

        }, completion: { finished in 0
            self.refreshView()
    })
}

我的问题是这个。我如何动画，以便当用户拖动一张卡片，并将它放在外面，左右边界，卡片继续翻译出屏幕上的方向，它是刷卡前重置为新的卡？

注意: springWithCompletion是一个在一定时间内执行动画的函数。

Answer 1

看看这个。用斯威夫特4写

func beingDragged(_ gestureRecognizer: UIPanGestureRecognizer) {

    xFromCenter = gestureRecognizer.translation(in: self).x
    yFromCenter = gestureRecognizer.translation(in: self).y
    switch gestureRecognizer.state {

    case .began:
        originalPoint = self.center;
        break;

    case .changed:
        let rotationStrength = min(xFromCenter / ROTATION_STRENGTH, ROTATION_MAX)
        let rotationAngel = .pi/8 * rotationStrength
        let scale = max(1 - fabs(rotationStrength) / SCALE_STRENGTH, SCALE_MAX)
        center = CGPoint(x: originalPoint.x + xFromCenter, y: originalPoint.y + yFromCenter)
        let transforms = CGAffineTransform(rotationAngle: rotationAngel)
        let scaleTransform: CGAffineTransform = transforms.scaledBy(x: scale, y: scale)
        self.transform = scaleTransform
        updateOverlay(xFromCenter)
        break;

    case .ended:
        afterSwipeAction()
        break;

    case .possible:break
    case .cancelled:break
    case .failed:break
    }
}

https://github.com/nickypatson/TinderSwipeView

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谢谢

Answer 2

只需使用UIPanGestureRecognizer并计算两个点之间的差异，以了解要动画的方向(处理程序被多次调用)。如果你需要同时动画x和y轴，那么它就变得更复杂了。

let panGesture = UIPanGestureRecognizer(target: self, action: Selector("onPan:"))
cardView.addGestureRecognizer(panGesture)

func onPan(gestureRecognizer: UIPanGestureRecognizer) {
    let point = gestureRecognizer.locationInView(maskView)