Underground Cavern by laspinter

Xamarin Tips: Access Progress Bar from the first page to the second page?

We can use MessagingCenter for this. In your first page, subscribe a message:

public FirstPage()
{
  MessagingCenter.Subscribe<SecondPage>(this, "StartProgress", (sender) =>
  {
    StartProgress();
   }); 
}
    
public void StartProgress()
{
   //do progression here
   //and set Progress bar 
}

In second page send the message:

private void Onpress(s, e)
{
   MessagingCenter.Send(this, "StartProgress");
    Navigation.PopToRootAsync();
}

You can find documentation in here.