c# - 带有 MasterDetails 页面和导航的 Xamarin.forms

Question

我有一个应用程序，我希望在其中有一个包含 2 个选项的母版页和每个详细信息页面的 toolbarItems。

例如，这里我有一个设置页面作为我的详细信息页面，它有两个 tollbaritems 保存和取消。这是用户必须输入必须保存的用户数据的形式。因此，在单击保存 toolbarItem 时，我想保存数据并将用户重定向到母版页列表选项(设置、登录)中未包含的其他页面(比如“PageA”)

我该怎么做？如果我执行 await Navigation.PushAsync(new PageA());，我不会获得主页。我返回图标以返回到主详细信息页面。但我想将用户重定向到一个页面，该页面也应该有 masterdetails 选项(设置和登录)。

我也在点击保存按钮时尝试过这个:

MasterDetailPage MDPage = new MasterDetailPage();
MDPage.Detail = new NavigationPage(new PageA());
MDPage.IsPresented = false;

提前致谢。

编辑这是我的代码:

母版.cs

public ListView ListView { get { return listView; } }

        ListView listView;
        public MasterPage()
        {
            var masterPageItems = new List<MasterPageItem>();
            masterPageItems.Add(new MasterPageItem
            {
                Title = "Settings",
                //IconSource = "Settings.png",
                TargetType = typeof(TestPage)
            });

            listView = new ListView
            {
                ItemsSource = masterPageItems,
                ItemTemplate = new DataTemplate(() =>
                {
                    var imageCell = new ImageCell();
                    imageCell.SetBinding(TextCell.TextProperty, "Title");
                    imageCell.SetBinding(ImageCell.ImageSourceProperty, "IconSource");
                    return imageCell;
                }),
                VerticalOptions = LayoutOptions.FillAndExpand,
                SeparatorVisibility = SeparatorVisibility.None
            };

            Padding = new Thickness(0, 40, 0, 0);
           // Icon = "hamburger.png";
            Title = "Menu";
            BackgroundColor = Color.FromHex("#4F6276");

            Content = new StackLayout
            {
                VerticalOptions = LayoutOptions.FillAndExpand,
                Children = {
                    listView
                }
            };
        }

MasterDetailsPage:

 public class MainPage : MasterDetailPage
    {
        public MainPage()
        {
            MasterPage masterPage;
            masterPage = new MasterPage();
            Master = masterPage;
            Detail = new NavigationPage(new TestPage())
            {
                //Tint = Color.Red // put your color here
                BarBackgroundColor = Color.FromRgb(172, 183, 193),//Color.FromHex("#9E9E9E"),
                BarTextColor = Color.Black,
                BackgroundColor = Color.White
            };
        }
     }

测试页:

public class TestPage : ContentPage
    {
        public TestPage()
        {
            Button test = new Button();
            test.Clicked += test_Clicked;
            test.Text = "Save";
            Button test1 = new Button();
            test1.Clicked += test1_Clicked;
            test1.Text = "cancel";
            Content = new StackLayout
            {
                Children = {
                    test,
                    test1
                }
            };
        }

        void test_Clicked(object sender, EventArgs e)
        {
            //redirect to new page(Page1)
        }
        void test1_Clicked(object sender, EventArgs e)
        {
            //redirect to new page(Page2)
        }
    }

我想从 onclick 事件重定向到一个新页面，比如 page1。我如何实现这一目标？

Answer 1

保存设置后，您应该更改现有 MasterDetailPage 实例的详细信息。

我认为最简单明了的方法是使用 MessagingCenter :

在设置页面:

MessagingCenter.Send(new OpenMyPageMessage(), OpenMyPageMessage.Key);

您的主从页面:

protected override void OnAppearing()
{
    MessagingCenter.Subscribe<OpenMyPageMessage>(this, OpenMyPageMessage.Key, (sender) =>
        {
            Detail = new YourAnotherPage();
        });
}

protected override void OnDisappearing()
{
    MessagingCenter.Unsubscribe<OpenMyPageMessage>(this, OpenMyPageMessage.Key);
}

OpenMyPageMes​​sage 只是一个简单的类:

public class OpenMyPageMessage
{
    public static string Key = "OpenMyPageMessage";
}

结果: