Xamarin.forms与MasterDetails页面和导航

Question

我有一个应用程序，我希望在每个详细信息页面都有一个包含2个选项和toolbarItems的母版页。

例如，这里我有一个设置页面作为我的详细信息页面，其中有两个tollbaritems保存和取消。 用户必须输入必须保存的用户数据的形式。 所以点击保存toolbarItem我想保存数据并将用户重定向到其他页面（比如'PageA'），这不包含在主页列表选项中（Settins，Login）

我该怎么办呢？ 如果我await Navigation.PushAsync(new PageA()); 我没有收到母版。 我回到图标回到主要详细信息页面。 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）。

我也在保存按钮点击中尝试了这个：

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：

MasterPage.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
            };
        }
     }

TestPage：

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事件重定向到新页面说page1。 我该如何实现这一目标？

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，最清晰的方法是使用MessagingCenter ：

在设置页面中：

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

您的主要详细信息页面：

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

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

而OpenMyPageMessage只是一个简单的类：

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

结果：

Answer 2

感谢Nikolai Doronin的 回答 ，我开始工作了。 我是这样做的：

MasterPage.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
            };
        }
        protected override void OnAppearing()
        {
            MessagingCenter.Subscribe<Class1.OpenMyPageMessage>(this, Class1.OpenMyPageMessage.Key, (sender) =>
            {
                Detail = new NavigationPage (Page1() };
            });
            MessagingCenter.Subscribe<Class1.OpenPage2>(this, Class1.OpenPage2.Key, (sender) =>
            {
                Detail = new NavigationPage( new Page2());
            });
        }

        protected override void OnDisappearing()
        {
            MessagingCenter.Unsubscribe<Class1.OpenMyPageMessage>(this, Class1.OpenMyPageMessage.Key);
            MessagingCenter.Unsubscribe<Class1.OpenPage2>(this, Class1.OpenPage2.Key);
        }
     }

TestPage：

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)
        {
             MessagingCenter.Send(new Class1.OpenPage2(), Class1.OpenPage2.Key);
        }
        void test1_Clicked(object sender, EventArgs e)
        {

        }
    }

class.cs

public class Class1
    {
        public class OpenMyPageMessage
        {
            public static string Key = "OpenMyPageMessage";
        }

        public class OpenPage2
        {
            public static string Key = "OpenPage2";
        }
    }