如何以编程方式从 UIViewRepresentable 触发 UIMenu

Question

我尝试创建一个自定义 SwiftUI 菜单（基于

UIMenu

）。

但是，我无法触发主要操作。

当我在 CustomMenu 上

点击

时它可以工作，但不会触发程序操作。我做错了什么？

struct CustomMenu: UIViewRepresentable {
    let title: String
    @Binding var isPresented: Bool

    func makeUIView(context: Context) -> UIButton {
        let button = UIButton(type: .system)
        button.setTitle(title, for: .normal)
        button.menu = UIMenu(title: "", options: .displayInline, children: [
            UIAction(title: "Item 1", image: UIImage(systemName: "mic"), handler: { _ in }),
            UIAction(title: "Item 2", image: UIImage(systemName: "envelope"), handler: { _ in }),
            UIAction(title: "Item 3", image: UIImage(systemName: "flame.fill"), handler: { _ in }),
            UIAction(title: "Item 4", image: UIImage(systemName: "video"), state: .on, handler: { _ in }),
        ])
        button.showsMenuAsPrimaryAction = true
        return button
    }

    func updateUIView(_ uiView: UIButton, context: Context) {
        if isPresented {
            // neither of .primaryActionTriggered, .menuActionTriggered, .touchUpInside works
            uiView.sendActions(for: .primaryActionTriggered)
        }
    }
}

struct ContentView: View {
    @State var menuPresented = false

    var body: some View {
        VStack {
            Button("Show menu programmatically") {
                menuPresented = true
            }
            CustomMenu(title: "Show menu on tap", isPresented: $menuPresented)
                .fixedSize()
        }
    }
}

Answer 1

如何以编程方式触发 UIMenu 的任何项目：

诀窍是你必须记住，在实践中，

UIMenuElement

实际上是

UIAction

。

并记住从“那个按钮”发送操作，这很令人困惑。

苏...

这里，

yourButton

是一个UIButton，您将其用作弹出菜单：

    for mc in yourButton.menu?.children ?? [] {
        print(" .. actual text of that menu item is", mc.title)
        if let solve = mc as? UIAction {
            print(solve) // debug info on your Xcode console
            solve.performWithSender(yourButton, target: self)
        }
    }

因此，此代码将按顺序触发每个菜单项作为测试：

    for i in 0..<(yourButton.menu.menu?.children ?? []).count {
        let mc = (yourButton.menu.menu?.children ?? [])[i]
        if let solve = mc as? UIAction {
            delay(Double(i) * 1.0) {
                print(solve)
                solve.performWithSender(self.yourButton.menu, target: self)
            }
        }
    }

就是这样！