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Re:Learning Swift: Building an App from Start to Finish by aerosmile on Friday September 12, 2014 @11:44AM (#8308649)
Interesting to see the migration process of an app from Objective C to Swift. I didn't know that an app can include both codebases at once.
Re:Learning Swift: Building an App from Start to Finish by melling on Friday September 12, 2014 @12:19PM (#8308854)
It was covered in the main WWDC video. There's an Apple iBook. You can find the book on Apple's site.

https://developer.apple.com/swift/resources/