[英]Xamarin forms Prism - Navigation from grid to content page. Page not shown
在ContentPage中,我在ListView中有一個“房間”列表。 當我單擊其中的一個時,它應導航到包含房間詳細信息的另一個ContentPage。 調用了新頁面的ViewModel上的OnNavigatedTo()(顯然沒有錯誤),但是該頁面沒有顯示。 它留在房間列表的頁面中。 我在Visual Studio 2015上使用Android(模擬器和電話)對其進行了測試。
這是列表頁面的XAML:
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:prism="clr-namespace:Prism.Mvvm;assembly=Prism.Forms"
xmlns:views="clr-namespace:StudentRooms.Views;assembly=StudentRooms"
prism:ViewModelLocator.AutowireViewModel="True"
x:Class="StudentRooms.Views.RoomsList">
<StackLayout Orientation="Vertical">
<ListView ItemsSource="{Binding Rooms}"
>
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<StackLayout Orientation="Horizontal" Spacing="10">
<StackLayout.GestureRecognizers>
<TapGestureRecognizer CommandParameter="{Binding Id}"
Command="{Binding BindingContext.RoomSelected, Source={views:RoomsList}}">
</TapGestureRecognizer>
</StackLayout.GestureRecognizers>
<Label Text="{Binding Name}" FontAttributes="Bold"/>
<Label Text="{Binding Description}"></Label>
<ProgressBar Progress="{Binding Occupancy}"/>
</StackLayout>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</StackLayout>
</ContentPage>
這是ViewModel的一個片段:
public RoomsListViewModel(INavigationService navigationService)
{
_navigationService = navigationService;
RoomSelected = new DelegateCommand<object>(NavigateToSelectedRoom);
}
private void NavigateToSelectedRoom(object id)
{
//var navParams = new NavigationParameters
//{
// { "RoomId", id }
//};
//_navigationService.NavigateAsync("RoomDetail", navParams);
_navigationService.NavigateAsync("RoomDetail");
}
詳細信息頁面:
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:prism="clr-namespace:Prism.Mvvm;assembly=Prism.Forms"
prism:ViewModelLocator.AutowireViewModel="True"
x:Class="StudentRooms.Views.RoomDetail">
<StackLayout>
<Label Text="AAA"></Label>
</StackLayout>
</ContentPage>
ViewModel的一個片段:
public void OnNavigatedTo(NavigationParameters parameters)
{
// on Debug I enter in this method!
}
確保在App.cs / App.xaml.cs文件中注冊要導航的頁面。
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