通过状态显示遮盖层，让 Menu 具备模态视图的特征（ 防止误触 ）

modalMenu.swift

struct ModalMenu: View {
    @State private var menuIsShowing = false
    @State private var selection: Int?
    let colors: [Color] = [Color.red, .blue, .green, .orange, .pink, .cyan, .brown]
    var body: some View {
        VStack {
            if let selection {
                Text("CurrentID: \(selection)")
            } else {
                Text("No ID selected")
            }
            ZStack {
                ScrollView {
                    ForEach(0..<20, id: \.self) { i in
                        cell(i: i)
                    }
                }

                // 添加遮罩
                if menuIsShowing {
                    Button { menuIsShowing = false } label: { Color.secondary.opacity(0.2) } // 可以用 Color.clear 显示为全透明
                        .zIndex(10) // 不显式设置 zIndex , 多次切换后可能会显示到 ScrollView 后面
                }
            }
            .ignoresSafeArea(.all)
        }
    }

    func cell(i: Int) -> some View {
        ZStack(alignment: .trailing) {
            Rectangle()
                .fill(colors[i % colors.count].opacity(0.3))
                .overlay(Text("ID:\(i)").font(.title))
                .onTapGesture {
                    selection = i
                }
            actionMenu(i: i)
                .padding(.trailing, 20)
        }
        .frame(height: 80)
    }

    func actionMenu(i: Int) -> some View {
        Menu {
            Button("ID:\(i) Action1") {
                // do action1
                print("action1 \(i)")
                menuIsShowing = false // 恢复状态
            }
            .onAppear {
                menuIsShowing = true
            }
            Button("ID:\(i) Action2") {
                // do action1
                print("action2 \(i)")
                menuIsShowing = false // 恢复状态
            }
        } label: {
            Image(systemName: "ellipsis.circle.fill") // 􀍢
                .font(.title)
                .foregroundColor(.secondary.opacity(0.5))
        }
        .controlSize(.large)
    }
}