A few months ago, I decided I'd get started porting SDCAlertView to Swift, but I was only a few minutes in until I ran into a problem I had no idea how to solve: I couldn't get my class names right in both Swift and Objective-C. Even though there are copious amounts of documentation covering the interoperability of Swift and Objective-C, somehow I couldn't get it to work and I brushed it off as me being stupid.
Tonight I tried again, and after some more research it turned out that the behavior I saw was actually a bug in the compiler! I'm surprised that the latest Xcode version is 6.1.1 and that apparently not enough people have run into this problem for Apple to make it a priority.
The bug can easily be reproduced by creating an Objective-C project in Xcode, and then adding the following Swift class:
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You would expect that, once you import MyProject-Swift.h in your Objective-C class, you could instantiate a class named SDCMyLabel. However, instead, you can only instantiate a class named MyLabel.
I found this very recent Stack Overflow question which pretty much asks the same thing. "milos" gives a great answer by explaining the observed behavior in Xcode 6.0.1, and the expected behavior according to the WWDC session video.
After reading the answer and watching the relevant parts of the vide, I slightly changed my previously-drawn conclusion from "I'm stupid" to "Xcode's stupid" and filed rdar://19261044. If you're running into the same problem, please duplicate and cross your fingers the engineers at the fruit company will fix it soon.