Xcode swift indexing forever

Happened to me with Xcode 7.3

Had to clean everything Xcode had cached to solve it.

Solution:

rm -frd ~/Library/Developer/Xcode/DerivedData/*

rm -frd ~/Library/Caches/com.apple.dt.Xcode/*

Killing the processes named 'swift' and then checking the error in xcode will give you the part of the code giving you trouble. There are some bugs in swift that needs to be circumvented.

To kill the process: Applications > Utilities > Activity Monitor. Then find the "swift" process, double click and choose Quit or Force Quit.

I had this same issue and it took me FOREVER to solve it. I'm pretty sure I've seen every question on the internet about this issue and I tried all of the solutions. Turns out all I had to do was....

Restart my computer