Hope all well here; long time no comment from me.
A while back I wrote a little iOS app in Xojo and it compiled fine. Since then I must've updated Xcode or something like that.
Starting scenario: Xojo 2019r1.1, Xcode11. Run button greyed out.
So I uninstalled Xcode 11 by deleting it from Applications and downloaded and installed Xcode 10.2, then restarted my machine. Run button not greyed out but Xojo now says 'Trying to run an iOS project with no iOS devices configured'.
Uninstall all simulators in Xcode then restart; go to Configuration and download iOS 12.1 simulator. Go back to Simulators and add a new one for iPhone X/12.1. Restart machine. I still get the same error.
Running xcode-select -p in Terminal gives me /Applications/Xcode.app/Contents/Developer which is correct.