I tried Xcode 9 and iOS 11 (not their new ARKit, just a normal game app), and like many others I suspect, I can no longer load or test apps on my iPhone (iOS 11). The phone always looks “busy” so my app will not load or run. I should note that nothing is running on my iPhone and it is unlocked and iTunes can access everything on it. This app loaded and ran on the last versions, but now, nothing. See attached screen grab for error message. REALLY looking forward to a fix, stuck.
UPDATE: I was able to load the app but not run it like usual in Xcode 9, So, testing is simply involves manually running the app vs running it within Xcode. Simple enough but would like the old function back, and loosing that “busy” error message would be nice.
ANSWER?: I found that if I shut down iTunes (my device settings are for it to auto start when I plug in my iPhone or iPad) then the Xcode 9.0.0 build will compile and run on your Apple devices running iOS 11. Otherwise, Xcode thinks the iPhone (or iPad) is “busy” and it will not load the app for testing. Easy workaround.