從標籤複製菜單

Question

我有代碼複製標籤中的數字。

我有一個用於複製的按鈕，我該如何使它在點擊它時打開照片中的菜單，然後點擊複製按鈕？

@IBAction func copybutton(_ sender: UIButton) { 
    UIPasteboard.general.string = displayResultLabel.text 
} 

Answer 1

從你的問題的信息微薄的量，希望我理解正確的問題。

我創建了一個具有UIViewController和UILabel和UIButton的示例。

無論何時按下按鈕，屏幕都將顯示帶有三個按鈕（Copy,Paste,View Memory）的操作表菜單。

當按下操作表中的Copy按鈕時，我們將複製標籤的文本。

這是代碼：

注：

UILabel命名displayResultLabel。

UIButton的動作名爲showActionSheetButtonAction。

class ViewController: UIViewController { 

    @IBOutlet weak var displayResultLabel: UILabel! 

    @IBAction func showActionSheetButtonAction(_ sender: UIButton) { 
     let actionSheetController = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet) 

     actionSheetController.addAction(
      UIAlertAction(title: "Copy", style: .default, handler: { [weak self] _ in 
       guard let strongSelf = self else { return } 

       UIPasteboard.general.string = strongSelf.displayResultLabel.text 
      }) 
     ) 

     actionSheetController.addAction(
      UIAlertAction(title: "Paste", style: .default, handler: { _ in 
       // Where to handle when the Paste button is pressed 
      }) 
     ) 

     actionSheetController.addAction(
      UIAlertAction(title: "View Memory", style: .default, handler: { _ in 
       // Where to handle when the View Memory button is pressed 
      }) 
     ) 

     actionSheetController.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil)) 

     present(actionSheetController, animated: true, completion: nil) 
    } 
} 

Answer 2

你需要繼承的UILabel，並改變一些默認的東西來實現這一點，首先你需要設置userInteractionEnable = true，默認情況下false在UILabel，你也需要重寫屬性canBecomeFirstResponder這是也默認爲假後，您可以顯示菜單成爲firstResponder標籤，並使用帶有longPressGestureRecognizer的UIMenuController，此類完整代碼位於此處

使用此的UILabel子類

import UIKit 

class ContextMenuLabel: UILabel { 

    /* 
    // Only override draw() if you perform custom drawing. 
    // An empty implementation adversely affects performance during animation. 
    override func draw(_ rect: CGRect) { 
     // Drawing code 
    } 
    */ 

    override func awakeFromNib() { 
     super.awakeFromNib() 
     self.isUserInteractionEnabled = true 
     let longPressGesture = UILongPressGestureRecognizer(target: self, action: #selector(self.showContextMenu)) 
     self.addGestureRecognizer(longPressGesture) 
    } 

    func showContextMenu() 
    { 
     self.becomeFirstResponder() 
     UIMenuController.shared.setTargetRect(self.frame, in: self.superview!) 
     let itemCopy = UIMenuItem(title: "Copy", action: #selector(self.copyAction)) 
     UIMenuController.shared.arrowDirection = .down 
     UIMenuController.shared.menuItems = [itemCopy] 
     UIMenuController.shared.setMenuVisible(true, animated: true) 

     debugPrint(UIMenuController.shared.menuFrame) 
    } 

    func copyAction() 
    { 
     UIPasteboard.general.string = self.text 
    } 

    override var canBecomeFirstResponder: Bool{ 
     get{ 
      return true 
     } 
    } 

} 

結果

希望這有助於