UIPanGestureRecognizer：第一次触摸发生的地方？

Question

许多教程存储第一次触摸的坐标，如下所示：

func panHandler(_ sender: UIPanGestureRecognizer) {

    if sender.state == .began
    {
        originalCenter = self.center
    }
}

有没有办法确切知道触摸发生在哪个位置，即在超视图的坐标系中？

Answer 1

试试这个

 let gestureView = sender.view
      let translation: CGPoint = sender.translation(in: gestureView)
 var   initialCenter = gesture.location(in: sender.view
              )
     if sender.state == .began {

            print("begin")


        }
 let point = CGPoint(x: CGFloat((initialCenter?.x)! + translation.x), y: CGFloat((initialCenter?.y)! + translation.y))
            print(point)

Answer 2

试试这个：

func panHandler(_ sender: UIPanGestureRecognizer) {

        if sender.state == .began
        {
          print("locationOfBeganTap -> (.\(touch.locationInView(view).x - touch.translationInView(view).x), .\(touch.locationInView(view).y - touch.translationInView(view).y))")
        }
}