Parse pointed out in a blog post that Swift is fully compatible with existing Objective-C libraries, including system libraries like Cocoa and third-party libraries like Parse, and it provided instructions for developers seeking to use Parse in their Swift projects.
Parse said in its blog post:
On Monday at WWDC 2014, Apple released a new programming language called Swift. As always, when we see that developers are excited about a new language or platform, we work quickly to make sure Parse can support that momentum. We’re excited about Swift because it brings a whole host of new language features to iOS and OS X development. Swift’s type inference will save developers a ton of typing, and generics will reduce runtime errors by giving us strongly-typed collections. To learn more about Swift, check out Apple’s reference book.