我有一个以下的视图(它是整个视图控制器的子视图):
在我添加子视图之前(当我将其注释掉时),平移手势在父视图上正常工作。然而,当我将子视图限制在父视图的中心并尝试将父视图移动到视图控制器时,它会表现得很奇怪(只能向左移动,向右移动时不断地抽搐回到中心位置)。
非常感谢您的任何帮助。
lazy var superView: UIView = {
let cv = UIView()
cv.backgroundColor = .gray
cv.translatesAutoresizingMaskIntoConstraints = false
cv.layer.cornerRadius = 5
cv.layer.masksToBounds = true
cv.isUserInteractionEnabled = true
cv.addGestureRecognizer(UIPanGestureRecognizer(target: self, action: #selector(handlePan)))
return cv
}()
这里是我设置它的限制条件:
// constraints for super view
func setupSuperView() {
superView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
superView.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
superView.widthAnchor.constraint(equalTo: view.widthAnchor, constant: -24).isActive = true
superView.heightAnchor.constraint(equalTo: view.heightAnchor, constant: -200).isActive = true
// ISSUE: For some reason, adding this subview with or without constraints screws up the pan functionality of the superview
superView.addSubview(subView)
}
这是我添加到超级视图中的子视图(我将其视为容器视图):
lazy var subview: UIImageView = {
let sv = UIImageView()
sv.translatesAutoresizingMaskIntoConstraints = false
sv.contentMode = .scaleAspectFill
return sv
}()
还有它的限制:
// constraints for yes/no view within superview
func setupSubView() {
subView.centerXAnchor.constraint(equalTo: superView.centerXAnchor).isActive = true
subView.centerYAnchor.constraint(equalTo: superView.centerYAnchor).isActive = true
}
最后,这里是我为平移手势建立功能的地方:
// pan functionality for swiping on superview
func handlePan(gesture: UIPanGestureRecognizer) {
guard let superview = gesture.view else {
return
}
// point you are tapped on
let point = gesture.translation(in: view)
// reference for how far left or right of the center of the superview your pan is
let xFromCenter = superview.center.x - view.center.x
// allows the superview to move with your finger
superview.center = CGPoint(x: view.center.x + point.x, y: view.center.y + point.y)
// dragged right
if xFromCenter > 0 {
subView.image = #imageLiteral(resourceName: "yes")
subView.tintColor = UIColor.green
// else dragged left
} else {
subView.image = #imageLiteral(resourceName: "no")
subView.tintColor = UIColor.red
}
// when you let go
if gesture.state == UIGestureRecognizerState.ended {
// animate superview back to center where it originally was
UIView.animate(withDuration: 0.2) {
superview.center = self.view.center
}
}
}
在我添加子视图之前(当我将其注释掉时),平移手势在父视图上正常工作。然而,当我将子视图限制在父视图的中心并尝试将父视图移动到视图控制器时,它会表现得很奇怪(只能向左移动,向右移动时不断地抽搐回到中心位置)。
非常感谢您的任何帮助。
superView.addSubview(subView)
函数。 - Aravind A Ruiview
或uiimageview
添加为子视图,则将其用户交互设置为false
,我认为它会起作用。 - Ketan Parmar