iOSView.CloseMethod
From Xojo Documentation
Method
For views that were displayed using PushTo, this closes the View causing the previous View to display.
Notes
Since calling Close displays the previous View, you can call it to simulate the user pressing a "Back" button on the View.
You cannot close the main View (the one that is specified as the Content for the Screen), however you can swap in another view by using the iOSApplication.CurrentScreen property.