How to create a separate view model for a contentview in Xamarin forms having prism?
Problem Statement
I want to create a contentview user control having its own view model that can be used in multiple content pages.
Issue in below implementation
I have extended my App.xaml.cs as mentioned below. But once the navigation works from the contentpage having contentview user control but if I navigate again to that page, the navigation doesn't work. Just to add to it, view.Parent also comes out to be null in the below code.
Please help.
using OEP.Views;
using Prism;
using Prism.Common;
using Prism.Ioc;
using Prism.Mvvm;
using Prism.Navigation;
using Prism.Unity;
using Unity.Resolution;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;
[assembly: XamlCompilation(XamlCompilationOptions.Compile)]
namespace OEP
{
public partial class App : PrismApplication
{
public App() : this(null) { }
public App(IPlatformInitializer initializer) : base(initializer) { }
protected override async void OnInitialized()
{
InitializeComponent();
//await NavigationService.NavigateAsync("NewOrderPage");
await NavigationService.NavigateAsync("LoginPage");
//await NavigationService.NavigateAsync("HomePage");
}
protected override void RegisterTypes(IContainerRegistry containerRegistry)
{
containerRegistry.RegisterForNavigation<LoginPage>();
containerRegistry.RegisterForNavigation<ForgotPasswordPage>();
containerRegistry.RegisterForNavigation<HomePage>();
containerRegistry.RegisterForNavigation<CustomerDetailsPage>();
containerRegistry.RegisterForNavigation<NewOrderPage>();
//Container.Resolve<HomePageCustomersUserControl>("Customers");
//containerRegistry.Register<HomePageCustomersUserControl, HomePageCustomersUserControlViewModel>();
//ViewModelLocationProvider.Register<HomePageCustomersUserControl>(() => Container.Resolve<HomePageCustomersUserControlViewModel>());
}
protected override void ConfigureViewModelLocator()
{
ViewModelLocationProvider.SetDefaultViewModelFactory((view, type) =>
{
Page page = null;
switch (view)
{
case Page page1:
page = page1;
break;
case Element customView:
page = GetPageFromElement(customView);
// Existing parameter with the Page
break;
}
var navService = CreateNavigationService(page);
ParameterOverrides overrides = new ParameterOverrides
{
{ "navigationService", navService }
};
return Container.GetContainer().Resolve(type, type.GetType().Name, overrides);
});
}
// Currently exists
protected INavigationService CreateNavigationService(Page page)
{
var navigationService = NavigationService;
((IPageAware)navigationService).Page = page;
return navigationService;
}
protected INavigationService CreateNavigationService(object view)
{
switch (view)
{
case Page page:
return CreateNavigationService(page);
case Element element:
var parentPage = GetPageFromElement(element);
if (parentPage == null)
{
return null;
}
return CreateNavigationService(parentPage);
default:
return null;
}
}
private Page GetPageFromElement(Element view)
{
switch (view.Parent)
{
case Page page:
return page;
case null:
return null;
default:
return GetPageFromElement(view.Parent);
}
}
protected override void OnStart()
{
// Handle when your app starts
}
protected override void OnSleep()
{
// Handle when your app sleeps
}
protected override void OnResume()
{
// Handle when your app resumes
}
}
}
xamarin.forms prism
add a comment |
Problem Statement
I want to create a contentview user control having its own view model that can be used in multiple content pages.
Issue in below implementation
I have extended my App.xaml.cs as mentioned below. But once the navigation works from the contentpage having contentview user control but if I navigate again to that page, the navigation doesn't work. Just to add to it, view.Parent also comes out to be null in the below code.
Please help.
using OEP.Views;
using Prism;
using Prism.Common;
using Prism.Ioc;
using Prism.Mvvm;
using Prism.Navigation;
using Prism.Unity;
using Unity.Resolution;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;
[assembly: XamlCompilation(XamlCompilationOptions.Compile)]
namespace OEP
{
public partial class App : PrismApplication
{
public App() : this(null) { }
public App(IPlatformInitializer initializer) : base(initializer) { }
protected override async void OnInitialized()
{
InitializeComponent();
//await NavigationService.NavigateAsync("NewOrderPage");
await NavigationService.NavigateAsync("LoginPage");
//await NavigationService.NavigateAsync("HomePage");
}
protected override void RegisterTypes(IContainerRegistry containerRegistry)
{
containerRegistry.RegisterForNavigation<LoginPage>();
containerRegistry.RegisterForNavigation<ForgotPasswordPage>();
containerRegistry.RegisterForNavigation<HomePage>();
containerRegistry.RegisterForNavigation<CustomerDetailsPage>();
containerRegistry.RegisterForNavigation<NewOrderPage>();
//Container.Resolve<HomePageCustomersUserControl>("Customers");
//containerRegistry.Register<HomePageCustomersUserControl, HomePageCustomersUserControlViewModel>();
//ViewModelLocationProvider.Register<HomePageCustomersUserControl>(() => Container.Resolve<HomePageCustomersUserControlViewModel>());
}
protected override void ConfigureViewModelLocator()
{
ViewModelLocationProvider.SetDefaultViewModelFactory((view, type) =>
{
Page page = null;
switch (view)
{
case Page page1:
page = page1;
break;
case Element customView:
page = GetPageFromElement(customView);
// Existing parameter with the Page
break;
}
var navService = CreateNavigationService(page);
ParameterOverrides overrides = new ParameterOverrides
{
{ "navigationService", navService }
};
return Container.GetContainer().Resolve(type, type.GetType().Name, overrides);
});
}
// Currently exists
protected INavigationService CreateNavigationService(Page page)
{
var navigationService = NavigationService;
((IPageAware)navigationService).Page = page;
return navigationService;
}
protected INavigationService CreateNavigationService(object view)
{
switch (view)
{
case Page page:
return CreateNavigationService(page);
case Element element:
var parentPage = GetPageFromElement(element);
if (parentPage == null)
{
return null;
}
return CreateNavigationService(parentPage);
default:
return null;
}
}
private Page GetPageFromElement(Element view)
{
switch (view.Parent)
{
case Page page:
return page;
case null:
return null;
default:
return GetPageFromElement(view.Parent);
}
}
protected override void OnStart()
{
// Handle when your app starts
}
protected override void OnSleep()
{
// Handle when your app sleeps
}
protected override void OnResume()
{
// Handle when your app resumes
}
}
}
xamarin.forms prism
add a comment |
Problem Statement
I want to create a contentview user control having its own view model that can be used in multiple content pages.
Issue in below implementation
I have extended my App.xaml.cs as mentioned below. But once the navigation works from the contentpage having contentview user control but if I navigate again to that page, the navigation doesn't work. Just to add to it, view.Parent also comes out to be null in the below code.
Please help.
using OEP.Views;
using Prism;
using Prism.Common;
using Prism.Ioc;
using Prism.Mvvm;
using Prism.Navigation;
using Prism.Unity;
using Unity.Resolution;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;
[assembly: XamlCompilation(XamlCompilationOptions.Compile)]
namespace OEP
{
public partial class App : PrismApplication
{
public App() : this(null) { }
public App(IPlatformInitializer initializer) : base(initializer) { }
protected override async void OnInitialized()
{
InitializeComponent();
//await NavigationService.NavigateAsync("NewOrderPage");
await NavigationService.NavigateAsync("LoginPage");
//await NavigationService.NavigateAsync("HomePage");
}
protected override void RegisterTypes(IContainerRegistry containerRegistry)
{
containerRegistry.RegisterForNavigation<LoginPage>();
containerRegistry.RegisterForNavigation<ForgotPasswordPage>();
containerRegistry.RegisterForNavigation<HomePage>();
containerRegistry.RegisterForNavigation<CustomerDetailsPage>();
containerRegistry.RegisterForNavigation<NewOrderPage>();
//Container.Resolve<HomePageCustomersUserControl>("Customers");
//containerRegistry.Register<HomePageCustomersUserControl, HomePageCustomersUserControlViewModel>();
//ViewModelLocationProvider.Register<HomePageCustomersUserControl>(() => Container.Resolve<HomePageCustomersUserControlViewModel>());
}
protected override void ConfigureViewModelLocator()
{
ViewModelLocationProvider.SetDefaultViewModelFactory((view, type) =>
{
Page page = null;
switch (view)
{
case Page page1:
page = page1;
break;
case Element customView:
page = GetPageFromElement(customView);
// Existing parameter with the Page
break;
}
var navService = CreateNavigationService(page);
ParameterOverrides overrides = new ParameterOverrides
{
{ "navigationService", navService }
};
return Container.GetContainer().Resolve(type, type.GetType().Name, overrides);
});
}
// Currently exists
protected INavigationService CreateNavigationService(Page page)
{
var navigationService = NavigationService;
((IPageAware)navigationService).Page = page;
return navigationService;
}
protected INavigationService CreateNavigationService(object view)
{
switch (view)
{
case Page page:
return CreateNavigationService(page);
case Element element:
var parentPage = GetPageFromElement(element);
if (parentPage == null)
{
return null;
}
return CreateNavigationService(parentPage);
default:
return null;
}
}
private Page GetPageFromElement(Element view)
{
switch (view.Parent)
{
case Page page:
return page;
case null:
return null;
default:
return GetPageFromElement(view.Parent);
}
}
protected override void OnStart()
{
// Handle when your app starts
}
protected override void OnSleep()
{
// Handle when your app sleeps
}
protected override void OnResume()
{
// Handle when your app resumes
}
}
}
xamarin.forms prism
Problem Statement
I want to create a contentview user control having its own view model that can be used in multiple content pages.
Issue in below implementation
I have extended my App.xaml.cs as mentioned below. But once the navigation works from the contentpage having contentview user control but if I navigate again to that page, the navigation doesn't work. Just to add to it, view.Parent also comes out to be null in the below code.
Please help.
using OEP.Views;
using Prism;
using Prism.Common;
using Prism.Ioc;
using Prism.Mvvm;
using Prism.Navigation;
using Prism.Unity;
using Unity.Resolution;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;
[assembly: XamlCompilation(XamlCompilationOptions.Compile)]
namespace OEP
{
public partial class App : PrismApplication
{
public App() : this(null) { }
public App(IPlatformInitializer initializer) : base(initializer) { }
protected override async void OnInitialized()
{
InitializeComponent();
//await NavigationService.NavigateAsync("NewOrderPage");
await NavigationService.NavigateAsync("LoginPage");
//await NavigationService.NavigateAsync("HomePage");
}
protected override void RegisterTypes(IContainerRegistry containerRegistry)
{
containerRegistry.RegisterForNavigation<LoginPage>();
containerRegistry.RegisterForNavigation<ForgotPasswordPage>();
containerRegistry.RegisterForNavigation<HomePage>();
containerRegistry.RegisterForNavigation<CustomerDetailsPage>();
containerRegistry.RegisterForNavigation<NewOrderPage>();
//Container.Resolve<HomePageCustomersUserControl>("Customers");
//containerRegistry.Register<HomePageCustomersUserControl, HomePageCustomersUserControlViewModel>();
//ViewModelLocationProvider.Register<HomePageCustomersUserControl>(() => Container.Resolve<HomePageCustomersUserControlViewModel>());
}
protected override void ConfigureViewModelLocator()
{
ViewModelLocationProvider.SetDefaultViewModelFactory((view, type) =>
{
Page page = null;
switch (view)
{
case Page page1:
page = page1;
break;
case Element customView:
page = GetPageFromElement(customView);
// Existing parameter with the Page
break;
}
var navService = CreateNavigationService(page);
ParameterOverrides overrides = new ParameterOverrides
{
{ "navigationService", navService }
};
return Container.GetContainer().Resolve(type, type.GetType().Name, overrides);
});
}
// Currently exists
protected INavigationService CreateNavigationService(Page page)
{
var navigationService = NavigationService;
((IPageAware)navigationService).Page = page;
return navigationService;
}
protected INavigationService CreateNavigationService(object view)
{
switch (view)
{
case Page page:
return CreateNavigationService(page);
case Element element:
var parentPage = GetPageFromElement(element);
if (parentPage == null)
{
return null;
}
return CreateNavigationService(parentPage);
default:
return null;
}
}
private Page GetPageFromElement(Element view)
{
switch (view.Parent)
{
case Page page:
return page;
case null:
return null;
default:
return GetPageFromElement(view.Parent);
}
}
protected override void OnStart()
{
// Handle when your app starts
}
protected override void OnSleep()
{
// Handle when your app sleeps
}
protected override void OnResume()
{
// Handle when your app resumes
}
}
}
xamarin.forms prism
xamarin.forms prism
asked Nov 20 '18 at 13:14
VantageVantage
257
257
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
This is supported in Prism 7.1. The following is taken directly from the Prism Unit Tests. If you're following the naming convention you actually do not need to register anything, you simply need to set ViewModelLocator.AutowirePartialView with a reference to the parent page.
<ContentView
xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="Prism.DI.Forms.Tests.Mocks.Views.PartialView">
<StackLayout>
<Label Text="{Binding SomeText}" />
<Button Command="{Binding NavigateCommand}"
x:Name="navigateButton" />
</StackLayout>
</ContentView>
<ContentPage
xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:local="clr-namespace:Prism.DI.Forms.Tests.Mocks.Views"
xmlns:prism="clr-namespace:Prism.Ioc;assembly=Prism.Forms"
xmlns:mvvm="clr-namespace:Prism.Mvvm;assembly=Prism.Forms"
xmlns:converters="using:Prism.Forms.Tests.Mocks.Converters"
Title="{Binding Title}"
x:Name="xamlViewMock"
x:Class="Prism.DI.Forms.Tests.Mocks.Views.XamlViewMock">
<ContentPage.Resources>
<ResourceDictionary>
<prism:ContainerProvider x:TypeArguments="converters:MockValueConverter" x:Key="mockValueConverter" />
</ResourceDictionary>
</ContentPage.Resources>
<StackLayout>
<local:PartialView mvvm:ViewModelLocator.AutowirePartialView="{x:Reference xamlViewMock}" />
<Entry x:Name="testEntry"
Text="{Binding Test,Converter={StaticResource mockValueConverter}}" />
</StackLayout>
</ContentPage>
- Partial View
- Consuming Page
In the event you need to follow some custom Naming scheme you simply need to call:
ViewModelLocationProvider.Register<MyView, SomeViewModel>();
It worked. Thanks.
– Vantage
Nov 21 '18 at 11:34
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
This is supported in Prism 7.1. The following is taken directly from the Prism Unit Tests. If you're following the naming convention you actually do not need to register anything, you simply need to set ViewModelLocator.AutowirePartialView with a reference to the parent page.
<ContentView
xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="Prism.DI.Forms.Tests.Mocks.Views.PartialView">
<StackLayout>
<Label Text="{Binding SomeText}" />
<Button Command="{Binding NavigateCommand}"
x:Name="navigateButton" />
</StackLayout>
</ContentView>
<ContentPage
xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:local="clr-namespace:Prism.DI.Forms.Tests.Mocks.Views"
xmlns:prism="clr-namespace:Prism.Ioc;assembly=Prism.Forms"
xmlns:mvvm="clr-namespace:Prism.Mvvm;assembly=Prism.Forms"
xmlns:converters="using:Prism.Forms.Tests.Mocks.Converters"
Title="{Binding Title}"
x:Name="xamlViewMock"
x:Class="Prism.DI.Forms.Tests.Mocks.Views.XamlViewMock">
<ContentPage.Resources>
<ResourceDictionary>
<prism:ContainerProvider x:TypeArguments="converters:MockValueConverter" x:Key="mockValueConverter" />
</ResourceDictionary>
</ContentPage.Resources>
<StackLayout>
<local:PartialView mvvm:ViewModelLocator.AutowirePartialView="{x:Reference xamlViewMock}" />
<Entry x:Name="testEntry"
Text="{Binding Test,Converter={StaticResource mockValueConverter}}" />
</StackLayout>
</ContentPage>
- Partial View
- Consuming Page
In the event you need to follow some custom Naming scheme you simply need to call:
ViewModelLocationProvider.Register<MyView, SomeViewModel>();
It worked. Thanks.
– Vantage
Nov 21 '18 at 11:34
add a comment |
This is supported in Prism 7.1. The following is taken directly from the Prism Unit Tests. If you're following the naming convention you actually do not need to register anything, you simply need to set ViewModelLocator.AutowirePartialView with a reference to the parent page.
<ContentView
xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="Prism.DI.Forms.Tests.Mocks.Views.PartialView">
<StackLayout>
<Label Text="{Binding SomeText}" />
<Button Command="{Binding NavigateCommand}"
x:Name="navigateButton" />
</StackLayout>
</ContentView>
<ContentPage
xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:local="clr-namespace:Prism.DI.Forms.Tests.Mocks.Views"
xmlns:prism="clr-namespace:Prism.Ioc;assembly=Prism.Forms"
xmlns:mvvm="clr-namespace:Prism.Mvvm;assembly=Prism.Forms"
xmlns:converters="using:Prism.Forms.Tests.Mocks.Converters"
Title="{Binding Title}"
x:Name="xamlViewMock"
x:Class="Prism.DI.Forms.Tests.Mocks.Views.XamlViewMock">
<ContentPage.Resources>
<ResourceDictionary>
<prism:ContainerProvider x:TypeArguments="converters:MockValueConverter" x:Key="mockValueConverter" />
</ResourceDictionary>
</ContentPage.Resources>
<StackLayout>
<local:PartialView mvvm:ViewModelLocator.AutowirePartialView="{x:Reference xamlViewMock}" />
<Entry x:Name="testEntry"
Text="{Binding Test,Converter={StaticResource mockValueConverter}}" />
</StackLayout>
</ContentPage>
- Partial View
- Consuming Page
In the event you need to follow some custom Naming scheme you simply need to call:
ViewModelLocationProvider.Register<MyView, SomeViewModel>();
It worked. Thanks.
– Vantage
Nov 21 '18 at 11:34
add a comment |
This is supported in Prism 7.1. The following is taken directly from the Prism Unit Tests. If you're following the naming convention you actually do not need to register anything, you simply need to set ViewModelLocator.AutowirePartialView with a reference to the parent page.
<ContentView
xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="Prism.DI.Forms.Tests.Mocks.Views.PartialView">
<StackLayout>
<Label Text="{Binding SomeText}" />
<Button Command="{Binding NavigateCommand}"
x:Name="navigateButton" />
</StackLayout>
</ContentView>
<ContentPage
xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:local="clr-namespace:Prism.DI.Forms.Tests.Mocks.Views"
xmlns:prism="clr-namespace:Prism.Ioc;assembly=Prism.Forms"
xmlns:mvvm="clr-namespace:Prism.Mvvm;assembly=Prism.Forms"
xmlns:converters="using:Prism.Forms.Tests.Mocks.Converters"
Title="{Binding Title}"
x:Name="xamlViewMock"
x:Class="Prism.DI.Forms.Tests.Mocks.Views.XamlViewMock">
<ContentPage.Resources>
<ResourceDictionary>
<prism:ContainerProvider x:TypeArguments="converters:MockValueConverter" x:Key="mockValueConverter" />
</ResourceDictionary>
</ContentPage.Resources>
<StackLayout>
<local:PartialView mvvm:ViewModelLocator.AutowirePartialView="{x:Reference xamlViewMock}" />
<Entry x:Name="testEntry"
Text="{Binding Test,Converter={StaticResource mockValueConverter}}" />
</StackLayout>
</ContentPage>
- Partial View
- Consuming Page
In the event you need to follow some custom Naming scheme you simply need to call:
ViewModelLocationProvider.Register<MyView, SomeViewModel>();
This is supported in Prism 7.1. The following is taken directly from the Prism Unit Tests. If you're following the naming convention you actually do not need to register anything, you simply need to set ViewModelLocator.AutowirePartialView with a reference to the parent page.
<ContentView
xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="Prism.DI.Forms.Tests.Mocks.Views.PartialView">
<StackLayout>
<Label Text="{Binding SomeText}" />
<Button Command="{Binding NavigateCommand}"
x:Name="navigateButton" />
</StackLayout>
</ContentView>
<ContentPage
xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:local="clr-namespace:Prism.DI.Forms.Tests.Mocks.Views"
xmlns:prism="clr-namespace:Prism.Ioc;assembly=Prism.Forms"
xmlns:mvvm="clr-namespace:Prism.Mvvm;assembly=Prism.Forms"
xmlns:converters="using:Prism.Forms.Tests.Mocks.Converters"
Title="{Binding Title}"
x:Name="xamlViewMock"
x:Class="Prism.DI.Forms.Tests.Mocks.Views.XamlViewMock">
<ContentPage.Resources>
<ResourceDictionary>
<prism:ContainerProvider x:TypeArguments="converters:MockValueConverter" x:Key="mockValueConverter" />
</ResourceDictionary>
</ContentPage.Resources>
<StackLayout>
<local:PartialView mvvm:ViewModelLocator.AutowirePartialView="{x:Reference xamlViewMock}" />
<Entry x:Name="testEntry"
Text="{Binding Test,Converter={StaticResource mockValueConverter}}" />
</StackLayout>
</ContentPage>
- Partial View
- Consuming Page
In the event you need to follow some custom Naming scheme you simply need to call:
ViewModelLocationProvider.Register<MyView, SomeViewModel>();
answered Nov 20 '18 at 22:34
Dan S.Dan S.
3,1312920
3,1312920
It worked. Thanks.
– Vantage
Nov 21 '18 at 11:34
add a comment |
It worked. Thanks.
– Vantage
Nov 21 '18 at 11:34
It worked. Thanks.
– Vantage
Nov 21 '18 at 11:34
It worked. Thanks.
– Vantage
Nov 21 '18 at 11:34
add a comment |
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