As described in blog post: http://corinnekrych.blogspot.fr/2015/04/how-well-does-swift-plays-on-ios7.html the goal is to have a Swift http lib compatible with iOS7 /ObjC .
An interesting open source library which used the Swift first approach (code written in Swift first but compatible with Objective-C) is Quick. Most of the code is written in Swift some adapters in Objective-C are required when Swift paradigm won't fit.
A POC has been done on ChuckNorrisJoke app to target iOS7, the POC involved small changes: https://github.com/aerogear/aerogear-ios-http/compare/master...corinnekrych:deployment.target.7.1
more compatibility work is to be done.
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