This defines a page with a background set to the theme resource ApplicationPageBackgroundThemeBrush, meaning it will adapt to the theme (Dark or Light) of the application.
The page contains a StackPanel, which will lay out controls in a vertical stack and is aligned in the center of the page, both horizontally and vertically. The StackPanel contains a single TextBlock control, which displays the text Hello Uno Platform and is aligned in the horizontal center of the StackPanel.
We're going to replace the existing TextBlock with an Image but before we can do this, we need to add the image file to the application. Download this SVG image and add it to the Assets folder inside the Counter project. At this point, you should rebuild the application in order for the image to be included in the application package.
Note
If you're working in Visual Studio, select the newly added logo.svg file in the Solution Explorer, open the Properties tool window, and make sure the Build Action property is set to UnoImage. For other IDEs, no further action is required as the template automatically sets the Build Action to UnoImage for all files in the Assets folder.
Including SVG files with the UnoImage build action will use Uno.Resizetizer to convert the SVG file to a PNG file for each platform. The generated PNG files will be included in the application package and used at runtime. For more information on using Uno.Resizetizer in Uno Platform, see Get Started with Uno.Resizetizer.
Now that we have the image file, we can replace the TextBlock with an Image.