App won't display changes

Hi, so just starting with OF.
My friend sent me a project for some projections with an app already built.
I have gone through and modified the code to show different things in the app.

For some reason the app isn’t picking up the changes, and is still displaying his old code.
I was just wondering how I can update the app to display the changes I made.

I have tried using the update feature in projectgenerator
Im using Xcode 8.2.1