The main problem is you don't just learn these things from the start. It's like somebody saying I'm interested in painting Impressionism like Monet, how can I learn to paint 

Take it step by step, learn the underlying concepts of programming first.

Try "Swift Playgrounds" a programming game for iPad, or Lego Mindstorms. This will get your brain thinking like a programmer.

Another option is if you like games, try Unity3d and follow some of the tutorials. You can start with drag and drop to make a simple game, and then slowly start coding some small things.