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[Swift] UIViewでアニメーション中の現在位置を取得する

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普通にcenterを取ると、アニメーション後の位置になるのでレイヤーから取得する。

extension UIView {
  func currentCenter() -> CGPoint{
    if let presentationLayer = layer.presentationLayer() {
      let pf = presentationLayer.frame
      return CGPoint(x: pf.origin.x + pf.size.width/2, y: pf.origin.y + pf.size.height/2)
    }else{
      return center
    }
  }
}
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