Xcode 8 syntax highlighting doesn't work

Question

The code above has correct syntax highlighting in Xcode 7. It is mix of Obj-C + Swift:

I\'ve updated project to support

Answer 1

I have found that when syntax highlighting falls over, switching tabs in Xcode fixes the issue ¯_(ツ)_/¯ sometimes I find I need to switch to at least 4 different tabs before it comes on again.

Otherwise a quit and reopen