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Learning Swift Second Edition

Learning Swift Second Edition

By : Andrew J Wagner
5 (1)
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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

Projects


Now that we have a pretty good understanding of Objective-C, let's discuss what Objective-C code looks like in a project. Unlike the Swift code, Objective-C is written in two different types of files. One of the types is called a header file and ends in the extension h. The other type is called an implementation file and ends in the extension m.

Before we can really discuss what the difference is between the two, we first have to discuss code exposure. In Swift, all the code you write is accessible to all other code in your project. This is not true with Objective-C. In Objective-C, you must explicitly indicate that you want to have access to the code in another file.

Header files

The header files are the types of files that can be included by other files. This means that header files should only contain the interfaces of types. In fact, this is why the separation exists between class interfaces and implementations. Any file can import a header file and that essentially inserts all...

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