Although XCode is not the worst IDE in the world, it is definitely buggy.

Countless times I have come up against a bug, almost always to do with provisioning profiles, build failures or sync issues which make no sense whatsoever. To prevent you banging your head constantly against a wall, when a problem seems totally illogical I always take these steps.

1. Stop the app
2. Delete from the device / simulator as appropriate
3. Restart XCode
4. Clean all builds
5. Pray

If that doesn’t work:

1. As above
2. Restart Mac
3. Restart iPhone

Trust me, more often than not that will fix all sorts of problems.