Start with Swift
Swift is the new programming language created by Apple. Apple promises that thanks to Swift writing apps for iOS and OS X will be faster, more intuitive, and… more funny. OK, lets take a short look.
Swift statements, for example, do not need semicolons at the end. You can have them, they won’t cause an error if you put a semicolon at the end of a statement. Nice, isn’t?
For a good start lynda.com has a nice and factual video course of Swift. If you are iOS developer is worth seeing. Full course is pay ofcourse, but first few lessons is free. Course is available here