After update xcode to v9 and xamarin, all worked fine for a couple of hours. But in some moment designer broke in XS and xcode. I try to open any of my .xib files from any project and XS says "There was a problem rendering this document" and xcode not showing .h file in assistant editor (if I choose it manual, it says "Outlet could not connect. No such class found"). I tried everything except reinstall xcode and xamarin. I looks like something global happened with xcode. Maybe some one have an ideas?