updated 03:44 pm EDT, Fri July 11, 2014
Promises news, help
Via its developer portal, Apple has launched an official blog for Swift, the programming language it unveiled at WWDC 2014. The blog promises a "behind-the-scenes look into the design of the Swift language by the engineers who created it," and "the latest news and hints to turn you into a productive Swift programmer." The first post discusses several compatibility issues.
Apple notes for example that Swift apps will run on OS X Mavericks and iOS 7 or later, since Xcode 6 embeds a Swift runtime library into app bundles. But "the Swift language itself will continue to evolve, and the binary interface will also change," the company adds. "To be safe, all components of your app should be built with the same version of Xcode and the Swift compiler to ensure that they work together." Apple in fact warns against relying on binary frameworks using Swift, "especially from third parties," but says that "when the binary interface stabilizes in a year or two, the Swift runtime will become part of the host OS and this limitation will no longer exist."
New features and syntax improvements are promised over time, along with Xcode tools to migrate source code.