1

我将 Auth0 与 Xamarin Forms PCL 库一起使用。我有以下 MainPage 类：

namespace LoginPattern
{
    public class MainPage : MasterDetailPage
    {
        public MainPage ()
        {
            Master = new MenuPage ();
            Detail = new DetailPage ();
        }
    }
}

并遵循应用程序类

public App ()
{   
    Current = this;

    Login ();
}

public void ShowMainPage ()
{   
    MainPage = new MainPage ();
}

public async void Login ()
{
    await DependencyService.Get<IAuth0WidgetLogin>().LoginUseAuth0EmbeddedWidget();
    App.Current.Properties["IsLoggedIn"] = true;

    ShowMainPage ();
}

因此，在登录时，我最初没有加载除 Auth0 登录小部件之外的任何页面。成功登录后，我想显示 MasterDetailPage。但我收到以下错误： Java.Lang.IllegalArgumentException: DrawerLayout must be measure with MeasureSpec.EXACTLY.

请告知我是否需要在 NavigationPage 中加载小部件以及如何加载。

编辑 17/7：

public class MenuPage : ContentPage
    {
        MasterDetailPage master;

        TableView tableView;

        public MenuPage ()
        {
            Title = "LoginPattern";
            Icon = "slideout.png";

            var section = new TableSection () {
                new TextCell {Text = "Sessions"},
                new TextCell {Text = "Speakers"},
                new TextCell {Text = "Favorites"},
                new TextCell {Text = "Room Plan"},
                new TextCell {Text = "Map"},
            };

            var root = new TableRoot () {section} ;

            tableView = new TableView ()
            { 
                Root = root,
                Intent = TableIntent.Menu,
            };

            var logoutButton = new Button { Text = "Logout" };
            logoutButton.Clicked += (sender, e) => {
                App.Current.Logout();
            };

            Content = new StackLayout {
                BackgroundColor = Color.Gray,
                VerticalOptions = LayoutOptions.FillAndExpand,
                Children = {
                    tableView, 
                    logoutButton
                }
            };
        }


    }


public class DetailPage : ContentPage
{
    public DetailPage ()
    {
        BackgroundColor = new Color (0, 0, 1, 0.2);

        var text = "Slide > to see the master / menu";

        if (Device.OS == TargetPlatform.Android) {
            text = @"Click the action bar dots to see the master / menu";
        } else if (Device.OS == TargetPlatform.WinPhone) {
            text = @"Click button \/ to see the master / menu ";
        }

        Content = new StackLayout { 
            HorizontalOptions = LayoutOptions.Center,
            Padding = new Thickness (10, 40, 10, 10),
            Children = {

                new Label { Text = text }
            }
        };
    }
}
4

2 回答 2

2

我会尝试做两件事：

  1. 在尝试显示身份验证小部件之前，将应用程序的 MainPage 设置为空白页面（或类似启动页面）。
  2. 在您的 MenuPage 上设置显式宽度请求。
于 2015-07-17T13:07:31.510 回答
1

只是为了帮助他人，以下是我的最终解决方案：

public class MainPage : MasterDetailPage
{
    public MainPage ()
    {
        Master = new MenuPage (this);
        Detail = new DetailPage ();
        ShowLoginDialog ();
    }

    async void ShowLoginDialog()
    {
        var page = new LoginPage();

        await Navigation.PushModalAsync(page);

        App.Current.Login ();
        await Navigation.PopModalAsync();
    }
}

PS：LoginPage 只是一个空的 ContentPage。

于 2015-07-20T15:38:56.560 回答