如何在SwiftUI中配置ContextMenu按钮以进行删除和禁用？ [英] How to configure ContextMenu buttons for delete and disabled in SwiftUI?

问题描述

我试图在 contextMenu 中配置按钮，但是它不起作用。

I tried to configure the button in the contextMenu, but it's not working.

Text("A label that have context menu")
    .contextMenu {
        Button(action: {
            // remove it
        }) {
            Text("Remove")
                .foregroundColor(.red) // Not working
            Image(systemName: "trash")
        }.disabled(true) // Not working
    }

我有什么：

我要查找的内容：（删除和通话按钮）

What I'm seeking: (delete and call buttons)

我会创建 UIAction 类似于 UIKit bu中的以下内容t我找不到任何修饰符，也无法将其带到 SwiftUI ：

I would create a UIAction like the following in UIKit but I can't find any modifier or anyway to bring this to the SwiftUI:

let delete = UIAction(title: "Remove", image: UIImage(systemName: "trash"), attributes: .destructive) { action in
    // remove it
}

推荐答案

切换确定视图是否可见的布尔值是可行的：

Toggling a boolean that determines if the view is visible works:

struct ContentView: View {
    @State var textVisible = true
    var body: some View {
        Group {
            if textVisible {
                Text("Hello World")
                .contextMenu {
                    Button(action: {
                        self.textVisible = false
                    }) {
                        HStack {
                            Text("Remove")
                            Image(systemName: "trash")
                        }
                    }
                }
            }
        }
    }
}

当然，由于上下文菜单附加到已删除的 Text 上，因此除非您有其他选择（例如按钮），用于切换布尔值（在这种情况下为 textVisible ）。

Of course, since the context menu is attached to the Text that was removed, it will be permanently removed unless you having something else (e.g a Button) that toggles the boolean (textVisible in this case).

编辑：OP想知道如何使上下文菜单中的按钮处于禁用/破坏性（灰色/红色前景色），但我认为截至2019年10月20日，SwiftUI的错误不允许上下文菜单中的任何按钮为红色以外的任何其他颜色。否则，将按钮设置为 .disabled（true）应该为它提供灰色并禁用它，然后将按钮的前景色设置为红色（ foregroundColor （.red））应该会使按钮具有破坏性。

Edit: OP wanted to know how to make buttons in the context menu disabled/destructive (grey/red foreground colors), but I believe that as of October 20, 2019, SwiftUI has a bug that doesn't allow any buttons in the context menu to be any color other than red. Otherwise, setting the button as .disabled(true) should give it a grey color and disable it, and setting the button's foreground color to red (foregroundColor(.red)) should make the button destructive.

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