swift - 读取 sender.tag 时将 UIImageView 与选择器@objc C 函数一起使用时 Swift 出错

Question

图像在按下时向@objc C 函数发送一个 Action :

 let imageView = UIImageView()
 imageView.tag = 3
 imageView.isUserInteractionEnabled = true
 imageView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(ItemAction)))
 imageView.image = UIImage(named: (itemDictionary[character.Equipment[imageView.tag]]!.image))
 overlayView.addSubview(imageView)

这是应该调用的函数:

@objc func ItemAction(sender: UIImageView!) {

    print(sender.tag)
    print("Item pressed from sender ")

}

该函数运行，但在打印发件人标签时我收到一条错误消息并且程序退出:

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UITapGestureRecognizer tag]: unrecognized selector sent to instance 0x600002b42a00'

带有 UIButton 的整个设置都有效。如何在外部函数中读取 UIImageView 的标签？

Answer 1

给你

  @objc func itemAction(_ sender: UITapGestureRecognizer){
        if let tag = sender.view?.tag{
            print("ImageView tag \(tag)")
        }
    }

在您的函数中将您的方法签名更改为

@objc func ItemAction(_ sender: UITapGestureRecognizer)