I've been an iOS developer for a little over 4 years now. I think you should invest some time on learning Objective-C. If you are looking to join an existing

I've been an iOS developer for a little over 4 years now. I think you should invest some time on learning Objective-C. If you are looking to join an existing company there is a very high probability that they will have existing apps, some perhaps with very large codebases, written in Objective-C. As a professional iOS developer you will be expected to be able to make modifications to these Objective-C apps. Even if the app is in "maintenance mode" you'll still probably have to be able to fix bugs in the old code base. Even for Objective-C apps that are actively being ported to Swift, you'll need to know Objective-C to handle the interop between the two languages as you slowly rewrite a large code base. I'd be willing to hire a junior iOS developer who only knew Swift with the expectation that they learn Objective-C on the job. But it would be major bonus points in the interview if they already had some proficiency with Objective-C.