ios - 更改 UIImageView 位置的问题

Question

我想在 ios 设备上移动 UIImageView。我可以移动它，但是偏移有问题，因为当我单击图像时，我将 ImageView 中心设置为 anchor 移动点。如何将触摸屏 CGPOint 设置为移动 UIImageView 的 anchor ？

override func touchesBegan( . . . ){
   location = touch.location(in : self.view)
   . . . 
   imageView.center = location
   . . .
}

override func touchesMoved( . . . ){
   location = touch.location(in : self.view)
   . . . 
   imageView.center = location
   . . .
}

Answer 1

试试这个:

var offset: CGPoint = CGPoint.zero

override func touchesBegan( . . . ){
    offset = touch.location(in: imageView)
    offset.x = (imageView.bounds.width / 2) - offset.x
    offset.y = (imageView.bounds.height / 2) - offset.y

    location = touch.location(in : self.view)
    location.x = location.x + offset.x
    location.y = location.y + offset.y
    . . .
    imageView.center = location
    . . .
}

override func touchesMoved( . . . ){
    location = touch.location(in : self.view)
    location.x = location.x + offset.x
    location.y = location.y + offset.y
    . . .
    imageView.center = location
    . . .
}