Another note after debugging a Cordova app with a user: you might want to go with the Xcode 7.3.1 stack in some cases, instead of with the newer Xcode 8.x.x stacks.
In their case once they switched to Xcode 7 the project worked immedately, as the project generated by Ionic/Cordova is compatible with Xcode 7, but not with Xcode 8 out of the box / without any modification (see my comment at Can I use Bitrise to automatically build (and deploy) Ionic 2 (Cordova) based apps? about the default generated Xcode project when using it with Xcode 8).