swift - 尝试调用长按手势并运行命令，但在函数中使用选择器时遇到 SIGABRT 错误。什么没有连接？

Question

我的代码:

override func viewDidLoad() {
    super.viewDidLoad()

    //Adding the long gesture
    let longGesture = UILongPressGestureRecognizer(target: self, action: #selector(longTap))

    //Adding the gesture to the button
    hydrogenBoxButton.addGestureRecognizer(longGesture)

    //Adding a tag for the button
    hydrogenBoxButton.tag = 1
}

然后我的函数在选择器中被调用:

 @objc func longTap(sender: UIButton) {

        if sender.tag == 1 {
            print("Hydrogen long tap worked!")
        } else if sender.tag == 2 {
            print("Helium long tap worked!")
        }
    }

但是，当我运行此命令并尝试长按按钮时，我收到此错误:

-[UILongPressGestureRecognizer tag]: unrecognized selector sent to instance 0x7fbc5ce00680

我不知道是因为我命名标签错误还是因为我创建 LongPressGestureRecognizer 的方式有问题。

Answer 1

参数的类型为UILongPressGestureRecognizer

@objc func longTap(sender: UILongPressGestureRecognizer ) {
        let tag = sender.view!.tag
        if tag == 1 {
            print("Hydrogen long tap worked!")
        } else if tag == 2 {
            print("Helium long tap worked!")
        }
}