Building For IOS Xcode Issue

I have recently purchased and set up my apple developers license and also purchased unity IOS. When testing a build and run to xcode with one simple scene the xcode project successfully starts building though it seems to be frozen and the one Compile XIB Classes seems to be the thing that is making it freeze. I also checked activity monitor and there is a Process called nterface Builder Cocoa Touch Tool that is taking up 99% of my CPU. Any ideas of what this issue might be? Thanks for the help in advance.

EDIT:

As soon as I press build and run the cocoa interface process starts running in my activity monitor and nothing happens in Xcode, then when I quit the process xcode build instantly everything with a green tick next to it apart from the Compile XIB Classes/Main Window.xib???