如何从另一个内容页面按钮单击打开主详细菜单? [英] How to open master detail menu from another content page button click?

问题描述

我想从另一个内容页面按钮点击事件打开主详细信息菜单?那么如何以 xamarin 形式执行此操作?

I want to open master details menu from another content page button click event? so how to do this in xamarin forms?

推荐答案

您可以通过将 MasterDetailPage.IsPresented 设置为 true 来打开菜单页面.

You can open menu page by setting MasterDetailPage.IsPresented to true.

执行此操作的简单方法是MessagingCenter.在 MasterDetailPage 中添加 MessagingCenter.Subscribe 并在您的 VM 中添加 MessagingCenter.Send

Simple way to do this is MessagingCenter. To MasterDetailPage add MessagingCenter.Subscribe and in your VM add MessagingCenter.Send

示例

public class MenuPage : ContentPage
{
    public MenuPage()
    {
        Title = "Test";
        Content = new StackLayout
        {
            Children = {
                new Label { Text = "Welcome to Xamarin.Forms!" }
            }
        };
    }
}

public class DetailPage : ContentPage
{
    public DetailPage()
    {
        var button = new Button()
        {
            Text = "Menu"
        };
        button.Clicked += Button_Clicked;
        Content = new StackLayout
        {
            Children = {
                button
            }
        };
    }

    private void Button_Clicked(object sender, EventArgs e)
    {
        MessagingCenter.Send(EventArgs.Empty, "OpenMenu");
    }
}


public partial class App : Application
{
    public App()
    {
        InitializeComponent();

        var masterDetailPage = new MasterDetailPage();
        masterDetailPage.Master = new MenuPage();
        masterDetailPage.Detail = new NavigationPage( new DetailPage());
        MainPage = masterDetailPage;
        MessagingCenter.Subscribe<EventArgs>(this, "OpenMenu", args =>
        {
            masterDetailPage.IsPresented = true;
        });

    }
}

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