在视图控制器上放置uiview对象的无限数组

问题描述

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
        }
    }
}