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Learning Swift Second Edition

Learning Swift Second Edition - Second Edition

By : Andrew J Wagner
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Learning Swift Second Edition

Learning Swift Second Edition

5 (1)
By: Andrew J Wagner

Overview of this book

Swift is Apple’s new programming language and the future of iOS and OS X app development. It is a high-performance language that feels like a modern scripting language. On the surface, Swift is easy to jump into, but it has complex underpinnings that are critical to becoming proficient at turning an idea into reality. This book is an approachable, step-by-step introduction into programming with Swift for everyone. It begins by giving you an overview of the key features through practical examples and progresses to more advanced topics that help differentiate the proficient developers from the mediocre ones. It covers important concepts such as Variables, Optionals, Closures, Generics, and Memory Management. Mixed in with those concepts, it also helps you learn the art of programming such as maintainability, useful design patterns, and resources to further your knowledge. This all culminates in writing a basic iOS app that will get you well on your way to turning your own app ideas into reality.
Table of Contents (14 chapters)
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13
Index

Protocols

The first tool we will look at is protocols. A protocol is essentially a contract that a type can sign, specifying that it will provide a certain interface to other components. This relationship is significantly looser than the relationship a subclass has with its superclass. A protocol does not provide any implementation to the types that implement them. Instead, a type can implement them in any way that they like.

Let's take a look at how we define a protocol, in order to understand them better.

Defining a protocol

Let's say we have some code that needs to interact with a collection of strings. We don't actually care what order they are stored in and we only need to be able to add and enumerate elements inside the container. One option would be to simply use an array, but an array does way more than we need it to. What if we decide later that we would rather write and read the elements from the file system? Furthermore, what if we want to write a container that...

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Learning Swift Second Edition
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