Swift is a multi-paradigm programming language and one of its most important paradigms is OOP. If you want to create great applications and apps for Mac, iPhone, iPad, Apple TV, and Apple Watch (macOS, iOS, tvOS and watchOS operating systems) you need to master OOP in Swift 3. However, Swift 3 is not limited to Apple platforms and you can take advantage of your Swift 3 knowledge to develop applications that target other platforms and use it for server-side code. In addition, as Swift also grabs nice features found in functional programming languages, it is convenient to know how to mix OOP code with functional programming code.
This book will allow you to develop high-quality reusable object-oriented code in Swift 3. You will learn the object-oriented programming principles and how Swift implements them. You will learn how to capture objects from real-world elements and create object-oriented code that represents them. You will understand Swift’s approach towards object-oriented code. You will maximize code reuse and reduce maintenance costs. Your code will be easy to understand and it will work with representations of real-life elements.
Swift 3 Object-Oriented Programming is organized in the following eight chapters:
Chapter 1, Objects from the real-word to the Playground, in this chapter we will learn the principles of object-oriented paradigms. We will understand how real-world objects can become part of fundamental elements in the code. We will translate elements into the different components of the object-oriented paradigm supported in Swift 3: classes, protocols, properties, methods and instances. We will run examples in Xcode 8, the Swift REPL and a Web-based Swift 3 sandbox.
Chapter 2, Structures, Classes and Instances, in this chapter, we will start generating blueprints to create objects. We will learn about an object’s life cycle and we will work with many examples to understand how object initializers and deinitializers work.
Chapter 3, Encapsulation of Data with Properties, in this chapter, we will start organizing data in the blueprints that generate objects. We will understand the different members of a class and how its different members are reflected in members of the instances generated from a class. We will learn the difference between mutable and immutable classes.
Chapter 4, Inheritance, Abstraction and Specialization, in this chapter, we will start creating a hierarchy of blueprints that generate objects. We will take advantage of inheritance and many related features to specialize behavior.
Chapter 5, Contract Programming with Protocols, in this chapter, we will understand how Swift works with protocols in combination with classes. We will declare and combine multiple blueprints to generate a single instance. We will declare protocols with different types of requirements, and then we will create classes that conform to these protocols.
Chapter 6, Maximization of Code Reuse with Generic Code, in this chapter, we will learn how to maximize code reuse by writing code capable of working with objects of different types, that is, instances of classes that conform to specific protocols or whose class hierarchy includes specific superclasses. We will work with protocols and generics.
Chapter 7, Object-Oriented Programming and Functional Programming, in this chapter, we will learn how to refactor existing code to take full advantage of object-oriented code. We will prepare the code for future requirements, reduce maintenance cost, and maximize code reuse. We will also work with many functional programming features included in Swift 3, combined with object-oriented programming.
Chapter 8, Protection and Organization of Code, in this chapter, we will put together all the pieces of the object-oriented puzzle. We will take advantage of extensions to add features to types, classes and protocols to which we don’t have access to the source code. We will make sure that the code exposes only the things that it has to expose and we will learn how everything we learned about object-oriented programming is useful in any kind of apps we might create.
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