Custom UIMenuController using button event error 只能有一个 UIMenuController 实例

Question

I create a button that when you hold, it will show the standard ios menu button for pasting a text, but I'm getting an error saying There can only be one UIMenuController instance. when I hold the button 2 times, how can I fix this?

Here is my code

override init(frame: CGRect) {
    super.init(frame: frame)
    self.configureView()
}
    
required init?(coder: NSCoder) {
    super.init(coder: coder)
    self.configureView()
}

private func configureView() {
    guard let view = self.loadViewFromNib(nibName: "CustomView") else { return }
    view.frame = self.bounds
    self.addSubview(view)
        
    button.addTarget(self, action: #selector(holdButton), for: .touchDown)
}

@objc func holdButton(_ sender: UIButton) {
    let menuController = UIMenuController()
    menuController.setTargetRect(sender.frame, in: charTextField)
    menuController.setMenuVisible(true, animated: true)
}

Also, how can I listen to the user when he clicked the paste button?

I want it to call this function when he clicked paste .

func pasteClick() {
    print("pasted", clipboardString())
}

Answer 1

Use the default singleton instance provided ( .shared ) by UIMenuController instead of creating an instance of your own.

@objc func holdButton(_ sender: UIButton) {
    UIMenuController.shared.setTargetRect(sender.frame, in: charTextField)
    UIMenuController.shared.setMenuVisible(true, animated: true)
}

Quoting from apple doc :

The singleton UIMenuController instance is referred to as the editing menu.....