Core Data in Swift

What Is Core Data?

In the simplest terms, Core Data is an object graph that can be persisted to disk. But just like describing a man as a “bag of mostly water,” that description hardly does Core Data justice. If you have worked with Interface Builder (specifically on OS X), you know that it effectively removes a third of the coding from the Model-View-Controller (MVC) design pattern. With Interface Builder, developers don’t need to spend countless hours writing and rewriting their user interface to make sure that it’s pixel perfect. Instead, they simply drag and drop the elements in the IDE, bind them together, and call it done.

Of course, the problem with Interface Builder is that we still need to code the other two parts! Both the controller ...