Xcode Source Kit will not stop crashing with Swift [duplicate]

Answer 1

You've probably tried all this, but just in case:

1. close Xcode
2. remove '~/Library/Developer/Xcode/DerivedData/'
3. remove '~/Library/Caches/com.apple.dt.Xcode'
4. restart your computer (just in case).

This should bring you code completion back, but the problem will eventually return. Xcode 6.1.1 beta (or now 6.2 beta with WatchKit) should fix many of the SourceKit related problems.

Answer 2

Dec 2, 2014, Apple deployed an update Xcode 6.1.1 that addressed the common source kit issue! For anybody who is coming across this issue.