有没有办法在该对象的动画期间获取 UIImageView 位置？

Question

我有一个函数可以动画化 UIImageView 在屏幕另一侧从一组坐标到另一组坐标的移动。在动画期间，我想记录点击图像时图像的位置。当我像这样打电话时，我得到的是目的地位置而不是当前位置：

var rippleImage = UIImageView()

//example animation block
UIView.animate(withDuration: 6, delay: 0.0, options: [.curveLinear, .allowUserInteraction], animations: {
        self.rippleImage.frame = CGRect(x: (xaxis - 500) , y: (yaxis - 500) , width: (self.rippleImage.frame.width + 1000), height: (self.rippleImage.frame.height + 1000))
        self.rippleImage.alpha = 0.1
    }, completion: nil )

//sample button click function to capture location
@objc func pianoKeyButtonTapped(sender: UIImageView) -> [String] {

    // get and animate current ripple
    let currentRippleLocation = self.rippleImage.frame
    print(currentRippleLocation)
}

在每种情况下，我都会得到相同的目的地位置，如下所示：

(-342.5, 67.0, 1060.0, 1060.0)

Answer 1

转换为 Swift 3 代码：

the presentationLayer - a property of the CALayer that "provides a close approximation to the version of the layer that is currently being displayed"

let currentRippleLocation = rippleImage.layer.presentation().frame

Answer 2

您必须根据您想要更改的特定 coordinates/size 调整我的答案，但我认为此解决方案应该适合您：

UIView.animate(withDuration: 0.1, delay: 0.0, options: [.curveLinear, .allowUserInteraction], animations: {
    UIView.setAnimationRepeatCount(100) //however many times you want
    self.rippleImage.frame.origin.x += 1 //example animation
    self.rippleImage.alpha -= 0.9/100 //you can adjust the variables to change incrementally 
}, completion: nil )

这样您收到的帧应该或多或少准确。

有没有办法在该对象的动画期间获取 UIImageView 位置？

Is there a way to get a UIImageView location during an animation of that object?

xcode

frame

uiimageview

ios

swift