如何解决在视图控制器上放置uiview对象的无限数组
我下面的快速代码的目标是在调用pressBtn函数时,将单个黑色视图添加到屏幕中央。此代码中的uiview称为Box。每次将时间框添加到屏幕中央时,都应将其连接到uipangesture,这样它便可以在其中移动,您可以在下面的gif中查看我要查找的内容。黑框被gif替换为x。
解决方法
您可以使用函数创建每个视图:
private func getBlackView() -> UIView {
let view = UIView()
view.backgroundColor = .black
let sideLength: CGFloat = 100
view.frame = .init(x: self.view.bounds.midX - sideLength / 2,y: self.view.bounds.midY - sideLength / 2,width: sideLength,height: sideLength)
let recognizer = UIPanGestureRecognizer(target: self,action: #selector(moveView(_:)))
view.addGestureRecognizer(recognizer)
return view
}
然后,在此函数中创建UIPanGestureRecognizer
并将其添加到每个新创建的视图中。该识别器的#selector
应该是:
@objc
private func moveView(_ recognizer: UIPanGestureRecognizer) {
switch recognizer.state {
case .began:
print("gesture began")
case .changed:
let translation = recognizer.translation(in: self.view)
recognizer.view!.center = .init(x: recognizer.view!.center.x + translation.x,y: recognizer.view!.center.y + translation.y)
recognizer.setTranslation(.zero,in: self.view)
default:
break
}
}
每次您识别出某个地理位置并且状态为.changed
时,都应按当前translation
移动视图并将其重置。
示例:
public class MyViewController : UIViewController {
public override func viewDidLoad() {
super.viewDidLoad()
button.frame = .init(x: self.view.bounds.midX,y: 0,width: 100,height: 100)
self.view.addSubview(button)
}
private lazy var button: UIButton = {
let button = UIButton()
button.backgroundColor = .blue
button.setTitleColor(.white,for: .normal)
button.setTitle("add",for: .normal)
button.addTarget(self,action: #selector(addBlackView),for: .touchUpInside)
return button
}()
private func getBlackView() -> UIView {
let view = UIView()
view.backgroundColor = .black
let sideLength: CGFloat = 100
view.frame = .init(x: self.view.bounds.midX - sideLength / 2,height: sideLength)
let recognizer = UIPanGestureRecognizer(target: self,action: #selector(moveView(_:)))
view.addGestureRecognizer(recognizer)
return view
}
@objc
private func addBlackView() {
let view = getBlackView()
self.view.addSubview(view)
}
@objc
private func moveView(_ recognizer: UIPanGestureRecognizer) {
switch recognizer.state {
case .began:
print("gesture began")
case .changed:
let translation = recognizer.translation(in: self.view)
recognizer.view!.center = .init(x: recognizer.view!.center.x + translation.x,y: recognizer.view!.center.y + translation.y)
recognizer.setTranslation(.zero,in: self.view)
default:
break
}
}
}
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