I need to create states picker in my Xamarin Forms. I am using Xaml file for creating views.
Can any one help me to bind Picker in Xaml with item source?
The XLabs has an excellent example of a bindable picker that I have used in several projects to great affect:
https://github.com/XLabs/Xamarin-Forms-Labs
This will allow you to replicate the 'ItemsSource' functionality of the Listview.
You won't be able to do this in XAML, as you can see here.
You'll have to load the data up in the code behind, using either their regular API, or something like this.
You can also serialize your list as a JSON or preferred format, and deserialize that and pass it to the Picker.
This functionality did not previous exist, but it was recently added to the regular Xamarin.Forms Picker via the new ItemsSource and SelectedItem properties. It is currently in the pre-release NuGet package for version 2.3.4-pre1, but should be in the stable 2.3.4+ versions once it is released.
As JordanMazurke commented, XLabs has it.
Here is an example:
<ContentPage x:Class="XLabs.Samples.Pages.Controls.ExtendedPickerPage"
xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:controls="clr-namespace:XLabs.Forms.Controls;assembly=XLabs.Forms"
Title="Picker">
<ContentPage.Content>
<StackLayout x:Name="myStackLayout">
<Label Text="Xaml:" />
<controls:ExtendedPicker x:Name="myPicker"
DisplayProperty="FirstName"
ItemsSource="{Binding MyDataList}"
SelectedItem="{Binding TheChosenOne}" />
</StackLayout>
</ContentPage.Content>
Related
I am relatively new to the world of Xamarin.Forms and have a question with regard to Xamarin TableView.
I want to create a layout similar to the one shown below.
Question is, can I use TableView for this or is there an another option for this? Can anyone show this with XAML code please?
Thanks in advance.
Edit: Tabs in the bottom are not required.
I don't mean to be rude, but this is very easy to retrieve from the documentation pages and a bit of trying yourself.
To get you started, try this:
<TableView Intent="Settings">
<TableView.Root>
<TableView.Section>
<ImageCell Text="Invoice Customization" Source="Invoice_image.png" />
<ImageCell Text="Invoice Defaults" Source="Invoice_image.png" />
</TableView.Section>
<TableView.Section Title="Security">
<SwitchCell Text="Use Touch ID" />
</TableView.Section>
... etc.
</TableView.Root>
</TableView>
The arrows at the end of the cells and the footer text underneath the Security section are not possible with Xamarin.Forms out of the box, this will probably require you to write a custom renderer.
Is it possible to create a global reference for a markup extension in Xamarin Forms?
I'm using a markup extension to provide localization, and would like to register the namespace once, rather than in every view.
For example, here is a simple page:
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="Views.Home"
xmlns:i18n="clr-namespace:App.Globalization">
<ContentPage.Content>
<StackLayout HorizontalOptions="Fill" VerticalOptions="Center">
<Label Text="{i18n:Translate Welcome}"
HorizontalOptions="Center"/>
</StackLayout>
</ContentPage.Content>
</ContentPage>
What I want to do is not require every page to include the xmlns:i18n namespace, but include it globally.
Short answer: No. It's not possible, unless you switch your xmlns definitions. And also please note this is a XML limitation, not just XAML.
How this works:
The only way to do this is through use of XmlnsDefinitionAttribute. XAML parsers (both compile-time, and run-time) look for these attributes on assemblies to glean the default global namespace declarations much like following line in AssemblyInfo in Xamarin.Forms.Core.
[assembly: XmlnsDefinition("http://xamarin.com/schemas/2014/forms", "Xamarin.Forms")]
You can find some of these parsing methods here.
The above line coupled with this attribute
xmlns="http://xamarin.com/schemas/2014/forms"
that is included by default in your custom XAML pages/views, allow you to directly use controls like ContentPage, StackLayout, Grid etc. without having to specify the Xamarin.Forms namespace
Now, you can see both XmlnsDefinitionAttribute, and XmlTypeExtensions are marked as internal. So there is no easy way to get around it.
What you can try is switching your xmlns namespace definitions as following (please note I am sharing this just for illustration purpose only). This will allow you to not have to specify prefix for TranslateExtension.
<f:ContentPage xmlns="clr-namespace:App.Globalization"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:local="clr-namespace:SampleApp"
xmlns:f="http://xamarin.com/schemas/2014/forms"
x:Class="SampleApp.MainPage">
<f:ContentPage.Content>
<f:StackLayout HorizontalOptions="Fill" VerticalOptions="Center">
<f:Label Text="{Translate Welcome}"
HorizontalOptions="Center"/>
</f:StackLayout>
</f:ContentPage.Content>
</f:ContentPage>
No. The same applies for C# code - can you declare using of some namespace globally? Of course not.
I am new to Xamarin development. I created new Xamarin XAML App(Xamarin.Forms Portable). In Portable Project there where MainPage.Xaml by default. To create MVVM Model I created three new Folders- Views, ViewModels, and Models. Now I added new MainPage.Xaml in Views folder and was going to delete the default MainPage.Xaml page. But here I see some difference in both pages. The default MainPage.Xaml have xmlns:local="clr-namespace:Test" but the new MainPage.Xaml does not. Again the new MainPage.Xaml have <Label Text="{Binding MainText}" VerticalOptions="Center" HorizontalOptions="Center" /> but the default one does not. The screenshots are:
What does these MarkUp mean.Why there is a difference. Does something needs to be changed. Can I delete the default MainPage.Xaml or should i copy it in Views.Does I need to copy the Markup from the default Page to the new one. If so why?
Thanks in advance
Both pages are identical, and will display in the same way.
On the second, there's an additional Xml namespace declaration:
xmlns:local="clr-namespace:Test"
It's only a declaration. You could remove it, or add it to the other page without effect. It's purpose is to be able to reference custom views declared in the current assembly and in the namespace (c# namespace, this time) Test, like this:
<ContentPage
...
xmlns:local="clr-namespace:Test"
x:Class="Test.MainPage">
<local:MyAwesomeView />
</ContentPage>
Awesome that you have decided to start with Xamarin and Xamarin.Forms!
While I understand you might be having these questions, this is some very basic XAML knowledge. The short answer is: you don't need to worry about it.
The long answer:
The reason that there is a difference in these pages is simply because it's just a template and whoever at Xamarin created the template for the project can be a different person than who created the template for a new XAML page. So they solved it different ways. Or maybe he had a good/bad day, who knows.
The Label in the first page is simply there to show you how to get started and so you won't start with an empty screen.
The extra namespace xmlns:local="clr-namespace:Test" is actually redundant in this new page but is already there so you can use the classes in your project.
It is actually the equivalent of the using list at the top of your classes. So whenever you need something from a different namespace you have to declare it there. So if you create a folder 'Controls' you can add a attribute xmlns:controls="clr-namespace:Test.Controls".
Note how I changed local to controls, this is the prefix you will use to define your instance. Also I have added the right namespace Test.Controls. Now if you want te show something on screen, in your XAML from the controls namespace, go like this:
<ContentPage xmlns:controls="clr-namespace:Test.Controls" x:Class="Test.MainPage">
<!-- some stuff here -->
<controls:ReusableControlHere />
</ContentPage>
Where ReusableControl can be your own version of a Label, Button or virtually anything.
I am working in windows store apps and I need help..
I am trying to adapt my app for the differents visual state (FullScreenLandscape, FullScreenPortrait, Snapped, etc) and I need to reuse the controls for each visual state..
I create a grid for each visual state for example
<Grid x:Name="PortraitView" Visibility="Collapsed">
</Grid>
<Grid x:Name="FillView" Visibility="Visible">
</Grid>
<Grid x:Name="SnapView" Visibility="Collapsed">
</Grid>
but my problem is that I can not repeat the x:name of the controls that I set in the Grid= PortraitView..
how can I resolve it?
thanks
From MSDN
The most common usage of this property is to specify a XAML element
name as an attribute in markup. This property essentially provides a
WPF framework-level convenience property to set the XAML x:Name
Directive.
Names must be unique within a namescope.
For more information, see XAML Namescopes.
I've been trying to get an App bar implemented in a WinRT metro app (C# / XAML), but don't know where to begin. I've tried using the <ApplicationBar/> tag and I get a Type not found error.
There's no help online, could someone update this post with the answer so that it'll serve as a reference to other programmers as well?
There's only a JavaScript sample which isn't of much help.
This should work:
<AppBar
VerticalAlignment="Bottom">
<Button
AutomationProperties.Name="Play"
Style="{StaticResource PlayAppBarButtonStyle}"
Command="{Binding PlayCommand}" />
</AppBar>
– you would put that in the layout root grid of your page.
*EDIT
Note: According to documentation - you should put it in Page.BottomAppBar property, although at least in Windows 8 Consumer Preview - it works fine when used in any Grid, which is convenient if your UI isn't tightly coupled to a Page control.
*EDIT 2, response from MSFT:
The recommended approach is to use the Page.BottomAppBar/TopAppBar properties.
There are known hit-testing issues in the Consumer Preview if AppBars are added without using these properties
The AppBars do not use the proper animations if they are added without using these properties
If AppBars are added as children of arbitrary elements then it's easier for multiple controls to attempt to create/modify AppBars, resulting in an inconsistent user experience
*EDIT 3
The CustomAppBar in WinRT XAML Toolkit can be used anywhere, animates based on Vertical/Horizontal-Alignment, can have other content overlaid on top of it and also has a CanOpen property that allows to block it from opening.
<Page.TopAppBar>
<AppBar>
<TextBlock x:Name="TextBlock1" Text="Sample Text" Margin="0,0,0,0" Height="Auto" VerticalAlignment="Center" HorizontalAlignment="Left"/>
</AppBar>
</Page.TopAppBar>