iOS / Swift :当UIButton上的触摸事件开始时，我如何向上或向下滚动视图？

// 创建UIScrollView对象
let scrollView = UIScrollView(frame: CGRect(x: 0, y: 0, width: 200, height: 200))
scrollView.contentSize = CGSize(width: 200, height: 400)

// 创建UIButton对象
let button = UIButton(type: .custom)
button.frame = CGRect(x: 0, y: 0, width: 200, height: 50)
button.setTitle("Button", for: .normal)

// 添加触摸事件处理方法
button.addTarget(self, action: #selector(buttonTouchDown), for: .touchDown)

// 将UIScrollView和UIButton添加到视图层级中
scrollView.addSubview(button)
view.addSubview(scrollView)

// 触摸事件处理方法
@objc func buttonTouchDown() {
    let targetRect = CGRect(x: 0, y: 200, width: 200, height: 200)
    scrollView.scrollRectToVisible(targetRect, animated: true)
}