This site will feature a wide variety of tutorials on both iOS and Mac development using the Swift programming language. In the future I also plan on doing some dedicated courses that will take projects from beginning to end. Hope you enjoy them.
Known as categories in Obj-C, extensions allow you to easily extend class functionality.
Learn to use storyboards to visually lay out and connect the views in your Mac app.
Learn to use the new live scripting environment called Playground in Xcode 6.