iOS 长按弹框，菜单栏

喜欢ヅ旅行 2024-04-17 16:39 72阅读 0赞

重写UIView，UIButton，UIImageView等，实现长按各种控件弹出菜单栏

class MenuView: UIView {
        override var canBecomeFirstResponder: Bool {
            return true
        }
        
        override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
            
            return super.canPerformAction(action, withSender: sender)
        }
    }

class MenuPicture: UIImageView {
        override var canBecomeFirstResponder: Bool {
            return true
        }
        
        override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
            
            return super.canPerformAction(action, withSender: sender)
        }
    }

class MenuLabel: UILabel {
        override var canBecomeFirstResponder: Bool {
            return true
        }
    
        override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
    
            return super.canPerformAction(action, withSender: sender)
        }
    }

值得注意的，也是我常犯的错误是，在继承自定义的View里面，要实现以下方法：

override var canBecomeFirstResponder: Bool {
            return true
        }
        
        override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
            if !isFirstResponder {
                // 文本框弹出键盘, 文本框才是第一响应者
                if action == #selector(handleCopyMessage(_:)) || action == #selector(handleRecallMessage(_:)) {
                    return true
                }
                //如果是文本框,那么这些显示都不返回
            }
            return super.canPerformAction(action, withSender: sender)
        }

handleCopyMessage(\_:) 是我自己实现的copy方法

handleRecallMessage(\_:) 是我自己实现的撤回方法

@objc func handleCopyMessage(_ menu: UIMenuController?) {
            let paste = UIPasteboard.general
            paste.string = messageLabel.text
        }
        
        @objc func handleRecallMessage(_ menu: UIMenuController?) {
            
            if recallMessageBlock != nil {
                recallMessageBlock!()
            }
        }

这样，我定义一个label，长按实现copy和撤回就很简单了：

@IBOutlet weak var messageLabel: MenuLabel!
    
        override func awakeFromNib() {
            super.awakeFromNib()
            
            messageLabel.isUserInteractionEnabled = true
    
            let longRecognizer = UILongPressGestureRecognizer.init(target: self, action: #selector(cellLongPress(_:)))
            (messageLabel.superview ?? contentView).addGestureRecognizer(longRecognizer) //messageLabel.superview 可以扩大label的点击范围，而菜单依然在label上哦
    
       }
    
        @objc func cellLongPress(_ recognizer: UILongPressGestureRecognizer) {
            if recognizer.state == .began {
                if let message = self.message, message.type == .TextMessageType {
                    if let label = messageLabel {
                        label.becomeFirstResponder()
                        let menu = UIMenuController.shared
                        let itCopy = UIMenuItem(title: getTranslation(textCode: "NT001") ?? "", action: #selector(self.handleCopyMessage(_:)))
    let itRecall = UIMenuItem(title: getTranslation(textCode: "NT494") ?? "", action: #selector(self.handleRecallMessage(_:)))
                        menu.menuItems = [itCopy, itRecall]
                        menu.setTargetRect(label.frame, in: label.superview!)
                        if menu.isMenuVisible {
                            return
                        }
                        menu.setMenuVisible(true, animated: true)
                    }
                }
            }
        }