如何在UIContextMenuInteractionDelegate中识别多视图点击源

先修正代码中的笔误 #

你的setup()方法里创建了interaction1和interaction2，但添加交互时错误使用了未定义的interaction变量，先修正这部分：

func setup() {
    let interaction1 = UIContextMenuInteraction(delegate: self)
    redView.addInteraction(interaction1)
    
    let interaction2 = UIContextMenuInteraction(delegate: self)
    blueView.addInteraction(interaction2)
}

区分点击视图的两种方法 #

方法一：直接判断交互所属的视图

UIContextMenuInteraction的view属性就是它被添加到的视图，直接通过恒等运算符===判断即可：

extension Cell: UIContextMenuInteractionDelegate {
    func contextMenuInteraction(_ interaction: UIContextMenuInteraction, configurationForMenuAtLocation location: CGPoint) -> UIContextMenuConfiguration? {
        return UIContextMenuConfiguration(identifier: nil, previewProvider: nil, actionProvider: { suggestedActions in
            var menu: UIMenu
            
            if interaction.view === self.redView {
                // 构建redView对应的菜单
                let action1 = UIAction(title: "红色视图操作1", image: UIImage(systemName: "circle.fill")) { _ in
                    // 执行对应操作
                }
                menu = UIMenu(title: "", children: [action1])
            } else if interaction.view === self.blueView {
                // 构建blueView对应的菜单
                let action2 = UIAction(title: "蓝色视图操作2", image: UIImage(systemName: "square.fill")) { _ in
                    // 执行对应操作
                }
                menu = UIMenu(title: "", children: [action2])
            } else {
                // 其他情况，返回默认菜单或nil
                return nil
            }
            
            return menu
        })
    }
}

方法二：给视图设置Tag标记

如果后续视图数量较多，也可以给视图设置tag来区分：

1. 在初始化视图时设置tag：

let redView = UIView()
redView.tag = 1001
let blueView = UIView()
blueView.tag = 1002

2. 在代理方法中通过interaction.view?.tag判断：

extension Cell: UIContextMenuInteractionDelegate {
    func contextMenuInteraction(_ interaction: UIContextMenuInteraction, configurationForMenuAtLocation location: CGPoint) -> UIContextMenuConfiguration? {
        return UIContextMenuConfiguration(identifier: nil, previewProvider: nil, actionProvider: { suggestedActions in
            guard let tag = interaction.view?.tag else { return nil }
            var menu: UIMenu
            
            switch tag {
            case 1001:
                // 红色视图专属菜单
                let action1 = UIAction(title: "红色视图操作1") { _ in }
                menu = UIMenu(children: [action1])
            case 1002:
                // 蓝色视图专属菜单
                let action2 = UIAction(title: "蓝色视图操作2") { _ in }
                menu = UIMenu(children: [action2])
            default:
                return nil
            }
            
            return menu
        })
    }
}

两种方法中，方法一更直观且不易出错，推荐优先使用。

内容的提问来源于stack exchange，提问作者Murat Merekov