如何隐藏 shell 中某些页面的后退按钮?

How can I hide the back button from certain pages in the shell?

仅在 loginnotifications 页面我希望用户无法 return 到上一页。在所有其他页面上,该过程可以正常进行。

到目前为止,我只能使用 BackButtonBehavior IsEnabled = "False" 禁用按钮单击操作。

NotificationsPage.xamlLoginPage.xaml

<Shell.BackButtonBehavior>
        <BackButtonBehavior IsEnabled="False"/>
</Shell.BackButtonBehavior>

TokenViewModel

await Shell.Current.GoToAsync($"{nameof(NotificacoesPage)}");

App.xaml.cs

await Shell.Current.GoToAsync($"{nameof(NotificacoesPage)}", false);

AppShell.xaml

<TabBar>
        <Tab Icon="notificacao_icone.png"
             Title="Notificações">
            <ShellContent ContentTemplate="{DataTemplate local:NotificacoesPage}" />
        </Tab>

        <Tab Icon="configuracoes_icone.png"
             Title="Configurações">
            <ShellContent ContentTemplate="{DataTemplate local:ConfiguracoesPage}" />
        </Tab>
</TabBar>

AppShell.xaml.cs

Routing.RegisterRoute(nameof(LoginPage), typeof(LoginPage));
Routing.RegisterRoute(nameof(TokenPage), typeof(TokenPage));
Routing.RegisterRoute(nameof(NotificacoesPage), typeof(NotificacoesPage));
Routing.RegisterRoute(nameof(NotificacaoDetalhePage), typeof(NotificacaoDetalhePage));
Routing.RegisterRoute(nameof(ConfiguracoesPage), typeof(ConfiguracoesPage));

这里有一个 workaround.You 可以隐藏整个导航栏,然后用 StackLayout 自定义一个 NavigationBar 来代替它。

类似于:

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
         xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
         x:Class="ShellNewDemo.Views.ItemDetailPage"
         Shell.NavBarIsVisible="False"   //hide the navigationbar
         >

  <ContentPage.Content>

      <StackLayout Orientation="Vertical">

        <StackLayout Orientation="Horizontal">

            //define your custom navigationbar

        </StackLayout>
        <StackLayout Orientation="Vertical">

           //content

        </StackLayout>

      </StackLayout>
    
  </ContentPage.Content>

</ContentPage>