Back button on Xamarin Cross Platform

Question

How to make a function for when to click "Back" on Android in Xamarin, the app goes back to the previous screen ?

Answer 1

On any Page, you can overwrite this method

    protected override bool OnBackButtonPressed()
    {
        return base.OnBackButtonPressed();
    }

Answer 2

Talking about Xamarin.Forms by "Cross Platform Xamarin", you must use the OnBackButtonPressed. But remembering as it says in the documentation:

The event is generated when the 'back' hardware button is pressed. This event is not generated on iOS.

Just replace this event on your Navigationpage and you’re ready to go:

protected override bool OnBackButtonPressed()
{    
    // A mágica acontece aqui
    return true;
}