I&#x27;ve been an iOS developer for a little over 4 years now.  I think you should invest <i>some</i> 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.<p>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 &quot;maintenance mode&quot; you&#x27;ll still probably have to be able to fix bugs in the old code base.<p>Even for Objective-C apps that are actively being ported to Swift, you&#x27;ll need to know Objective-C to handle the interop between the two languages as you slowly rewrite a large code base.<p>I&#x27;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.