要使PanGestureRecognizer在contentview中生效,您需要确保以下几点:
- 将PanGestureRecognizer添加到contentview上,而不是添加到父视图上。
- 将contentview的userInteractionEnabled属性设置为true,以确保它能够接收触摸事件。
- 检查其他视图或手势识别器是否干扰了PanGestureRecognizer的操作。
以下是一个示例代码,演示了如何在contentview中使用PanGestureRecognizer:
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// 创建contentview
let contentView = UIView(frame: CGRect(x: 0, y: 0, width: 200, height: 200))
contentView.backgroundColor = .blue
contentView.isUserInteractionEnabled = true // 确保contentview可以接收触摸事件
view.addSubview(contentView)
// 创建PanGestureRecognizer并将其添加到contentview上
let panGestureRecognizer = UIPanGestureRecognizer(target: self, action: #selector(handlePan(_:)))
contentView.addGestureRecognizer(panGestureRecognizer)
}
@objc func handlePan(_ recognizer: UIPanGestureRecognizer) {
if recognizer.state == .changed {
// 处理拖动事件
let translation = recognizer.translation(in: view)
recognizer.view?.center = CGPoint(x: recognizer.view!.center.x + translation.x, y: recognizer.view!.center.y + translation.y)
recognizer.setTranslation(CGPoint.zero, in: view)
}
}
}
通过上述代码,您可以在contentview中使用PanGestureRecognizer,并在拖动时移动contentview。