Xcode 6.3 Crashes when navigating from storyboard to other Swift 1.2 file

Question

I installed Xcode 6.3 which includes support for Swift 1.2. It turned up a ton of error messages, which are mostly casting issues.

I navigated to the storyboard, an

Answer 1

Launching Xcode while holding shift fixed it for me.

(This suppresses Xcode's state restoration.)

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Update: Xcode 6.3.1, released today, resolves this issue.

Answer 2

Update Xcode 6.3.1

For me, everything works !

Answer 3

It is not a bug anymore since Apple fixed it in Xcode 6.3.1.

Answer 4

Temporary solution:

If you have currently opened Assistant Editor switch to another file using alt+click. You can keep your @IBDesignables.

Answer 5

I can confirm this bug. I was stuck in storyboard and could do nothing to get out of it (couldn't even open the assistant). As a workaround, with the storyboard open, right-click the .storyboard file and select Open As - Source Code. This will switch your storyboard to code and you will be able to then switch to any file.

Answer 6

I gather from the apple developer forums that this is an @IBDesignable issue. Especially in projects that use custom fonts, additional xibs, etc.

I have somehow fixed my issue by removing all @IBDesignable from swift UIView class definitions. You can open your project directory with TextMate or other, search and remove all "@IBDesignable"

However I still think this is a MAJOR bug, that needs to be worked on.. so keep filing bug reports to Apple.