iOS Developer. Started at February 2012. At that time I suddenly found out, that the Objective-C language exists. I was familiar with Java, C# and C++ at that time and decided to try reading the code of a simple "Hello world!" application. I visited Wikipedia and realized I could not understand anything... I found some links to the books related to Objective-C, read them in a couple days and then decided to become an iOS developer, because the language did really suite my preferences
As of 2017 I cannot imagine myself without Swift