UIPanGestureRecognizer不起作用-Java 学习之路

-2

这很奇怪，但是当我向视图添加 UIPanGestureRecognizer 时它不起作用 . 这是我的观点，白色视图是红色视图的子视图：

enter image description here

Main View:

@IBOutlet weak var redView: UIView!
@IBOutlet weak var whiteView: UIView!
override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    let panRecognizer = UIPanGestureRecognizer(target:self, action:#selector(ViewController.handlePan))
    whiteView.gestureRecognizers = [panRecognizer]        
}


func handlePan(recognizer:UIPanGestureRecognizer)  {
    //foo
}

当我点击并拖动白色视图时，它将不会移动 .

3 回答

这是答案：

class ViewController: UIViewController {

    @IBOutlet weak var redView: UIView!
    @IBOutlet weak var whiteView: UIView!

    var lastLocation:CGPoint = CGPointMake(0, 0)


    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        let panRecognizer = UIPanGestureRecognizer(target:self, action:#selector(ViewController.handlePan))
        whiteView.addGestureRecognizer(panRecognizer)

    }


    func handlePan(recognizer:UIPanGestureRecognizer)  {
        let translation  = recognizer.translationInView(redView)
        whiteView.center = CGPointMake(lastLocation.x + translation.x, lastLocation.y + translation.y)
    }

    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
        // Promote the touched view
        lastLocation = whiteView.center

    }
}

回复于 2024-05-05T19:24:42+08:00

-2
试试这个：
```
whiteView.userInteractionEnabled=true
```
回复于 2024-05-05T19:24:42+08:00

如果您使用swift语言方法，则无法使用 [] .

var PanGesture = UIPanGestureRecognizer(target: self, action: "respondToPanGesture:")
whiteView.addGestureRecognizer(PanGesture)

希望能帮助到你 .

回复于 2024-05-05T19:24:42+08:00

UIPanGestureRecognizer不起作用

3 回答

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