How to intercept Navigation Bar Back Button Clicked in Xamarin Forms?

Question

I have a xamarin form page where a user can update some data in a form. I need to intercept the Navigation Bar Back Button Clicked to warn the user if some data have not bee

Answer 1

This is an inherently difficult task and the only way I got around it was to remove the back button entirely and then handle the backwards navigation from a 'save' button.

I have done a brief search of the Xamarin.Forms forum and the following has been suggested:

public override bool OnOptionsItemSelected(Android.Views.IMenuItem item)
{
    return false;
}

The link for the post is as follows:

https://forums.xamarin.com/discussion/21631/is-there-nay-way-of-cancelling-the-back-button-event-from-the-navigationpage