This is odd because I am a Swift Developer and they have had me go through the interview process

With Swift being a new norm, it is not known by all devs at large corporations. Swift is a Protocol Driven Language, which allows the Object Oriented properties to jump to the next step. Not only do you have objects that can be referenced and mutated, you also have the use of protocols and delegation that allows for observing changes on objects in related classes.

Swift is the new language that is been developed by Apple for developing iOS apps and is Object oriented, but earlier Objective C was used to develop apps, Even though now some frameworks are bridged into swift from objective C only.