I've been banging my head against the wall for the past few days trying to work with a storyboard I've been working on for quite some time, and now it seems I can't get anything done with it. If I open my project, then select the storyboard, it usually will at least load and display the storyboard, but then if I modify a view, Xcode hangs and 'Interface Builder Cocoa Touch Tool' spins at 100% cpu core usage in the background. I'm then forced to kill Xcode and submit a crash report. I've probably reported 40 hangs at this point. If I then start Xcode again, it loads the project and automatically tries to open the storyboard, at which point it hangs before even loading the storyboard with the cocoa touch tool spinning in the background.
At a complete loss as to what to do here. I first encountered the issue on 7.3.1, and thinking it may have been a recent update that caused the issue tried Xcode 7.3 and Xcode 7.2, but I get the same behavior. I seem to have better luck editing the storyboard in Xcode 8 beta, but that's not a great solution since it's beta software and would require me to fork 3rd party libraries and update them to Swift 2.3 syntax.
I'm running El Capitan 10.11.5. Perhaps there's some issue introduced by El Capitan?
