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

Mike Berg mberg at solstice-consulting.com
Fri Apr 22 16:03:44 CDT 2016

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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