I'm using Xcode 6.0.1 to develop an iOS 8 app and I'm getting a new error that I never got when I was using Xcode 5 and iOS 7: when I use the story board builder, Xcode often freezes up with the spinning beach ball of doom (or whatever they call it). Sometimes, all it takes is moving an object in a view controller to cause this.
I have noticed that, when this error happens, my Activity Monitor shows that the "Interface Builder Cocoa Touch Tool" process has a % CPU value of between 98 and 100! I have to force quit this process and force close Xcode (which is unresponsive). However, this doesn't solve the problem, because it comes back when I use the story board again later, and sometimes it comes back when I simply try to open Xcode.
I have also tried restarting my computer and clearing out the derived data, neither of which have solved the problem. I also turned indexing off so that Xcode wouldn't index all my files and run really slowly. This didn't help though.
I've seen other people with this same problem (using older versions of Xcode), but none of them have provided a solution that worked for me.
Please help. Thanks.
I had this bug too,
It seems it has been fixed with xcode 6.1 (download it in apple developer member center).