ios - 在 UILabel 上显示 iPhone 剪切复制粘贴菜单

Question

1. 我们能否像为 UITextField 那样为 UILabel 启用剪切复制粘贴菜单？

2. 如果没有，我需要将我的UILabel 转换为UITextField，我怎样才能启用剪切复制粘贴菜单并且不允许修改内容?

Answer 1

对于 Swift 你必须实现这个类:

import UIKit

class CopyableLabel: UILabel {

    override init(frame: CGRect) {
        super.init(frame: frame)
        self.sharedInit()
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        self.sharedInit()
    }

    func sharedInit() {
        self.isUserInteractionEnabled = true
        let gesture = UILongPressGestureRecognizer(target: self, action: #selector(self.showMenu))
        self.addGestureRecognizer(gesture)
    }

    @objc func showMenu(_ recognizer: UILongPressGestureRecognizer) {
        self.becomeFirstResponder()
    
        let menu = UIMenuController.shared
    
        let locationOfTouchInLabel = recognizer.location(in: self)

        if !menu.isMenuVisible {
            var rect = bounds
            rect.origin = locationOfTouchInLabel
            rect.size = CGSize(width: 1, height: 1)
        
            menu.showMenu(from: self, rect: rect)
        }
    }

    override func copy(_ sender: Any?) {
        let board = UIPasteboard.general
    
        board.string = text
    
        let menu = UIMenuController.shared
    
        menu.setMenuVisible(false, animated: true)
    }

    override var canBecomeFirstResponder: Bool {
        return true
    }

    override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
        return action == #selector(UIResponderStandardEditActions.copy)
    }
}

在你的 Storyboard中，只需将 UILabel 子类化为 CopyableLabel 类