这是我的代码:
let newView = ImageView()
newView.translatesAutoresizingMaskIntoConstraints = false
newView.backgroundColor = .random()
view.addSubview(newView)
newView.widthAnchor.constraint(equalToConstant: 100).isActive = true
newView.heightAnchor.constraint(equalToConstant: 100).isActive = true
newView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
newView.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
let panGR = UIPanGestureRecognizer(target: self, action: #selector(handlePan))
panGR.delegate = self
newView.addGestureRecognizer(panGR)
let pinchGR = UIPinchGestureRecognizer(target: self, action: #selector(handlePinch(pinch:)))
pinchGR.delegate = self
newView.addGestureRecognizer(pinchGR)
let rotateGR = UIRotationGestureRecognizer(target: self, action: #selector(handleRotate(rotate:)))
rotateGR.delegate = self
newView.addGestureRecognizer(rotateGR)
每次按下该按钮,它将运行此代码。但是,所有子视图都会不断重置其位置。
这是'handlePan'的代码:
@objc func handlePan(_ gestureRecognizer : UIPanGestureRecognizer){
if gestureRecognizer.state == .began || gestureRecognizer.state == .changed {
let translation = gestureRecognizer.translation(in: self.view)
gestureRecognizer.view!.center = CGPoint(x: gestureRecognizer.view!.center.x + translation.x, y: gestureRecognizer.view!.center.y + translation.y)
gestureRecognizer.setTranslation(CGPoint.zero, in: self.view)
}
}
因为您在创建自定义视图时设置了约束。
将自定义视图添加到超级视图后,您可以通过拖动来更改其位置-但您只需更改center
属性即可。好。
当您将新的自定义视图添加到您的超级视图时-将执行布局子视图。并且所有子视图位置将根据初始约束进行重置。
您需要:
handlePan(_ gestureRecognizer : UIPanGestureRecognizer)
功能更改中centerXAnchor,centerYAnchor
约束值,不是中心属性。因为在任何布局子视图之后,它们的位置都将设置为原始位置。