11. An Introduction to Swift Subclassing and Extensions
In “The Basics of Swift Object-Oriented Programming” we covered the basic concepts of object-oriented programming and worked through an example of creating and working with a new class using Swift. In that example, our new class was not derived from any base class and, as such, did not inherit any traits from a parent or super class. In this chapter we will introduce the concepts of subclassing, inheritance and extensions in Swift.
11.1 Inheritance, Classes and Subclasses
The concept of inheritance brings something of a real-world view to programming. It allows a class to be defined that has a certain set of characteristics (such as methods and properties) and then other classes to be created ...
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