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Creating a new solution
Installing and using the Prism Template Pack
The easiest way to get a new solution up and running is with the Prism Template Pack. Let's start by installing it in Visual Studio.
Go to Tools > Extensions and Updates
select Online
and search for Prism Template Pack. Locate the the extensions, click Download
, and complete the installation. Click the Restart Now
button.
Now that we have the Template Pack installed, lets create a new solution. Go to File > New > Project...
select Installed > Templates > Visual C# > Prism
. Here you will find all the templates available for a new Prism project/solution.
Select Prism Unity App (Forms) Visual C#
fill in the name of your project/solution and click OK
A new solution was created with a Portable Class Library (PCL) project labeled (Portable)
and device-dependent projects (Android, iOS, Windows Phone). NuGet packages were added to these projects for Xamarin.Forms, Prism, and Prism.Unity along with all their dependencies.
Running the app
Android
Right click on the Android project and select set as startup project. Also ensure build and deploy are both checked for the Android project in the Configuration Manager.
Open the Xamarin Android Player and ensure that a device image is installed and note the API level of the device image.
Open the Android project properties and change the Minimum Android to target to be equal or less than the API level of the device image you will be running on.
Select the Android Player device from the Debug drop down menu and click the debug play button (or press F5).
iOS
This is for Visual Studio (on Windows):
First make sure that there's a connection with the Xamarin Mac Agent.
Right click on the iOS project and select set as startup project. Also ensure build and deploy are both checked for the iOS project in the Configuration Manager.
For running the application on a physical iOS device, there must be an connected the iOS device to the PC. The build configuration needs to be set on 'iPhone' (even for testing with an iPad).If there is only one iOS device attached to the PC it'll select the one. When there're multiple iOS devices attached, you must select with device you want to run on.
For running the application on a iOS simulator needs the build configuration be set to 'iPhoneSimulator' (even for testing with an iPad simulator).
After chosen the build configuration, the app can be run by click the debug play button (or press F5).
Windows Phone
To be added.
Views
Within the Portable project there is a View
folder. This folder will contain all of your view related code. The template created a Content Page called MainPage.xaml
in this folder. Lets take a look at this file.
There are some important things happening here, let's break down whats going on.
xmlns:prism='http://prismlibrary.com'
The Prism library is referenced.
prism:ViewModelLocator.AutowireViewModel='True'
This view (MainPage.xaml) is wired to the view model (MainPageViewModel.cs) automatically via naming conventions allowing for databinding to the view model. See ViewModelLocator documentation for more information.
<Label Text='{Binding Title}' />
A label is created on the page with the text bound to the property named Title in the view model (MainPageViewModel.cs).
View Models
Within the Portable project there is a ViewModels
folder. This folder will contain all of your view model related code. The template created a view model for the MainPage called MainPageViewModel.cs
in this folder. Lets take a look at this class and break down what is going on here.
The MainPageViewModel inherits from BindableBase
and implements the INavigationAware
interface.
The BindableBase
class implements the INotifyPropertyChanged interface which allows for the view to be able to databind to properties created here. BindableBase
also provides a protected SetProperty
method to simplify creating these properties.
The INavigationAware
interface allows for the view model to be notified when it is being navigated from or being navigated to. See the INavigationAware documentation for more information.
Creates a public property named Title that triggers the OnPropertyChanged event when the value is set.
These methods are called with the view model is navigated from or to. Here it expects a string via the NavigationParameters parameter and modifies the Title property with the string's value. See the INavigationAware documentation for more information.
Adding a new Page (View) and ViewModel
Now that we have a basic understanding of how project is setup with Prism for Xamarin.Forms, let's add to it and create a new Page (View) and ViewModel. We'll create a page with a text entry field and a button similar to the wireframe below. Later we'll add functionality to make the phone speak the text that's entered into the text field.
View
Let's create the new content page in the project, also known as the view. Again, the easiest way to do this is with the Prism Template Pack. We'll create the view first. Right click on the Views
folder, click Add > New Item...
under Installed > Visual C# > Prism > Forms
select Prism ContentPage (Forms)
. Name the page SpeakPage.xaml
and click Add
. This creates a blank content page.
There are many different types of pages available in Xamarin Forms, but the ContentPage is one of the most basic. It displays a single visual object, typically a layout. UpdateSpeakPage.xaml
to have the contents shown below.
Let's break down what is going on here.
xmlns:prism='http://prismlibrary.com'
The Prism library is referenced.
prism:ViewModelLocator.AutowireViewModel='True'
This view (SpeakPage.xaml) is wired to the view model (SpeakPageViewModel.cs) automatically via naming conventions allowing for databinding to the view model. See ViewModelLocator documentation for more information.
This sets the ContentPage's view to a StackLayout. A StackLayout positions it's child elements each on a single line, stacking them either horizontally or vertically. This is a very common layout used within Xamarin Forms. We're using it along with it's VerticalOptions set to CenterAndExpand so the child elements show up as stacked vertically and centered as shown in the wireframe above.
<Entry Text='{Binding TextToSay}' />
An Entry is provided that allows the user to enter text. The text that is entered is Command='{Binding SpeakCommand}'/>A Button is placed below the Entry. The button's command is executed when it is clicked and is bound to a command named SpeakCommand in the SpeakPageViewModel, which we'll create soon.
View Model
Now that we have a view named SpeakPage, we'll add it's corresponding view model. As with all the other steps, the easiest way to create a view model is with the Prism Template Pack. Right click on the ViewModels
folder, click Add > New Item...
under Installed > Visual C# > Prism > Forms
select Prism ViewModel
. Name the page SpeakPageViewModel.cs
and click Add
. This creates a view model for the SpeakPage. Update SpeakPageViewModel.cs
to have the following contents within the namespace.
Let's break down what is going on here.
Creates a string property that the text entry field is bound to. The initial text is 'Hello Prism'. SetProperty
is provided by Prism to simplify creating bindable properties. See the ViewModels section of this document for more information.
Creates a DelegateCommand called SpeakCommand
that the Speak button is bound to. The SpeakCommand
is created in the SpeakPageViewModel
constructor and will invoke the Speak
method, which hasn't been written yet. To be able to perform the actual text-to-speech platform specific APIs need to be used. This is outside the scope of this documentation, but head over to the IPlatformInitializer documentation to see how this is done.
Navigating to your new page
We now have two pages in our app, a main page and a speak page. To navigate to the new page, we'll need to register the page for navigation. In the Portable Class Library, HelloXFPrism (Portable)
, open App.xaml.cs (you may have to click the carrot next to App.xaml to see it). Register the new page for navigation by updating RegisterTypes(IContainerRegistry containerRegistry)
to include the following.
You can now navigate to the new page so let's setup MainPage to navigate. In MainPage.xaml
add a button below the existing label.
Now we need to update MainPage's view model to include the NavigateToSpeakPageCommand
and perform navigation. Update MainPageViewModel.cs
to include the following.
Let's break down what's going on here.
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Using dependency injection, gets the navigation service and also creates the NavigateToSpeakPageCommand.
Tells the navigation service to navigate to the SpeakPage.
With navigation all wired up and the 'Navigate to speak page' button is pressed in the view the NavigateToSpeakPageCommand will be called on the view model, the command will execute the NavigateToSpeakPage method, and finally the Navigation Service will perform the navigation to the SpeakPage.
For more information on the navigation service see the navigation service documentation