Do you have any experience coding in Swift? If so, how did you like it?
If you’ve produced functional apps in Swift besides the basic ones they teach you in tutorials, be ready to display them and describe your experience coding them. If not, that’s ok. However, make sure you have at least fiddled around with Swift so that you have enough knowledge for the interview. If for the issue of liking it or not, be honest even if you prefer Objective-C. Don’t be overly negative or appear unwilling to improve your skills in it if necessary.