将UIPanGestureRecognizer限制为边界快速

import UIKit

class ViewController: UIViewController {
    var panGesture: UIPanGestureRecognizer!
    var boundaryView: UIView!
    var boundaryRect: CGRect!

    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建边界视图
        boundaryView = UIView(frame: CGRect(x: 100, y: 100, width: 200, height: 200))
        boundaryView.backgroundColor = UIColor.lightGray
        view.addSubview(boundaryView)
        
        // 创建手势识别器
        panGesture = UIPanGestureRecognizer(target: self, action: #selector(handlePan(_:)))
        boundaryView.addGestureRecognizer(panGesture)
        
        // 设置边界范围
        boundaryRect = boundaryView.frame
    }
    
    @objc func handlePan(_ gesture: UIPanGestureRecognizer) {
        let translation = gesture.translation(in: boundaryView)
        
        // 判断手势是否超出边界范围
        let newX = boundaryView.frame.origin.x + translation.x
        let newY = boundaryView.frame.origin.y + translation.y
        let newFrame = CGRect(x: newX, y: newY, width: boundaryView.frame.width, height: boundaryView.frame.height)
        
        if boundaryRect.contains(newFrame) {
            // 更新视图位置
            boundaryView.frame = newFrame
        }
        
        gesture.setTranslation(CGPoint.zero, in: boundaryView)
    }
}