How to get data value from popup page event to the previous page of popup page?

In page1 I have a button and by clicking that will open a popup with two button.
One button will generate bool true and another one will generate false.
When any of popup button is getting clicked the popup will close and the bool value will come to the previous page of popup page.
and the previous page will be as it was before, I mean there will be no new page1 instance will be created when the value is coming from popup event.