Xcode code sense and cmd+click to symbol doesn't work for 1 of my projects

Question

I\'ve been using Xcode 4.3.1 since it came out now and i\'ve worked on many different projects since. Everything has always worked fine until this 1 new project i\'m working

Answer 1

Similar issues with XCode 8. Just quitting the XCode and Simulator, reopening the project worked. Other times, Restarting the mac gets rid of question mark and does navigate to relevant method implementations

And at times, simply closing the project and opening it again from 'File -> Open Recent' also works (XCode 8 and Swift 3)