[swift-dev] Libraries written in Objective-C in Swift 3

David Smith david_smith at apple.com
Fri Apr 22 16:20:45 CDT 2016

Hi Mike,

The Foundation shipping with OS X and iOS is still written in Objective-C. The Swift-Corelibs Foundation is for use on other platforms currently.


> On Apr 22, 2016, at 2:03 PM, Mike Berg via swift-dev <swift-dev at swift.org> wrote:
> Hi everyone,
> A question has come up on my project that nobody seems to have an answer for. I was hoping someone here might know:
> On my project, we have a longstanding iOS application that has both objC and swift source files. As is the case for most old apps out there (a few years), we regularly use swift code in objC and vice versa.
> We have been keeping tabs on how Swift has been expanding and we noticed that with Swift 3, the foundation classes will be rewritten in swift. So does this mean that all Swift classes using Foundation automatically start using Foundation written in Swift or is it opt-in? If it’s mandatory, then will libraries dependent on the Objective-C runtime no longer work (i.e. the Alamofire git repo)?
> Thanks for reading and take care,
> -- 
> Michael Berg
> Technical Analyst
> Solstice Mobile
> (630) 414-6938
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