Using IPlatformInitializer

warning

Legacy Documentation: This documentation is for legacy Xamarin.Forms applications only. Xamarin.Forms is End of Life and Prism no longer supports it. This documentation is provided for historical reference only.

The IPlatformInitializer was used in Prism for Xamarin.Forms to register platform-specific types with Prism's container. This is no longer needed in modern Prism applications using .NET MAUI or Uno Platform, as these platforms have built-in dependency injection support.

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The IPlatformInitializer is a very simple interface which simply contains a single method for RegisterTypes. The IPlatformInitializer can then be passed into the PrismApplication when you create your app. For iOS you might simply have the following code:

public partial class AppDelegate : FormsApplicationDelegate, IPlatformInitializer
{
    public override bool FinishedLaunching(UIApplication app, NSDictionary options)
    {
        global::Xamarin.Forms.Forms.Init();
        LoadApplication(new App(this));

        return base.FinishedLaunching(app, options);
    }

    public void RegisterTypes(IContainerRegistry containerRegistry)
    {
        containerRegistry.Register<ITextToSpeech, TextToSpeech>();
    }
}

Keep in mind that you will need to be sure your App contains the proper constructor overload like the following:

public class App : PrismApplication
{
    public App(IPlatformInitializer initializer)
        : base(initializer)
    {
    }
}