以编程方式添加视图和手势 - “发送到实例的无法识别的选择器”

Posted 2023-03-16

【中文标题】以编程方式添加视图和手势 - “发送到实例的无法识别的选择器”

【英文标题】：Programmatically adding a view and gesture - "unrecognized selector sent to instance"

【发布时间】：2016-09-24 21:52:48

【问题描述】：

当我删除发件人时，我可以调用“handleTap”函数，但是当我重新添加sender: UIPanGestureRecognizer 时，我会收到此错误：unrecognized selector sent to instance。我想不通！

class DrawingViewController: UIViewController, UIGestureRecognizerDelegate 

var newlyAddedSticker = UIImage() 
    didSet 
        makeNewSticker()
    


func makeNewSticker() 
    let newSticker = UIImageView(image: newlyAddedSticker)
    view.addSubview(newSticker)

    let myPanGesture = UIPanGestureRecognizer(target: self, action: "handleTap:")
    myPanGesture.delegate = self
    newSticker.isUserInteractionEnabled = true
    newSticker.addGestureRecognizer(myPanGesture)


func handleTap(sender: UIPanGestureRecognizer) 
    print("hi")

【问题讨论】：

UIPanGestureRecognizer(target: self, action: #selector(handleTap(_:))) 和 func handleTap(_ panGestureRecognizer: UIPanGestureRecognizer)

【参考方案1】：

问题是你没有指定选择器

 let myPanGesture = UIPanGestureRecognizer(target: self, action: #selector(YourViewController.handleTap))

func handleTap() 
    print("hi")

希望这会有所帮助