我一直在StackOverflow上搜索了几天,没有任何答案可行。
我有一个UIImageView,我试图能够在其内部移动标签。现在我可以移动标签,但它超出了UIImageView的范围。
到目前为止,我的代码是pan手势:
var initialCenter = CGPoint()
@objc func userDragged(pan: UIPanGestureRecognizer) {
guard let senderView = pan.view else { return }
guard let parentView = senderView.superview else { return }
let translation = pan.translation(in: imageHolder)
if pan.state == .began {
self.initialCenter = senderView.center
print(self.initialCenter)
}
// update the position.
if pan.state == .changed {
let newCenter = CGPoint(x: initialCenter.x + translation.x, y: initialCenter.y + translation.y)
senderView.center = newCenter
} else if pan.state == .ended || pan.state == .cancelled {
print("ended or cancelled")
let finalCenter = CGPoint(x: senderView.center.x, y: senderView.center.y)
senderView.center = finalCenter
} else {
senderView.center = initialCenter
}
}
您可能需要在此处将标签添加到imageView。
override func viewDidAppear(_ animated: Bool) {
// imageHolder is UIImageView.
imageHolder.clipsToBounds = true
imageHolder.backgroundColor = UIColor.black
//the label is called labelView here
imageHolder.addSubview(self.labelView)
imageHolder.isUserInteractionEnabled = true
self.labelView.isUserInteractionEnabled = true
}