I'll take the counter-point here and vote for Objective-C. Swift has not reached a level of maturity that we're comfortable with it for mission-critical code. E

I'll take the counter-point here and vote for Objective-C. Swift has not reached a level of maturity that we're comfortable with it for mission-critical code. Each Xcode revision brings breaking changes which require you to address manually, as the migrator is lacking. Interop with Obj-C works OK - not great - but with pure C, it's a hassle. And the libraries and tools around Swift are just nowhere near as mature as they are for Obj-C... even first party; case in point, Xcode cannot even rename methods or extract constants from Swift code. No refactoring capability at all. Having built several large apps which are live in the Store in both languages, I'm sticking with Obj-C for 2016. Give Swift another year before going all in.