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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

Creational patterns


The final type of design patterns we will discuss is called creational patterns. These patterns relate to the initialization of new objects. At first, the initialization of an object probably seems simple and not a very important place to have design patterns. After all, we already have initializers. However, in certain circumstances, creational patterns can be extremely helpful.

Singleton/shared instance

The first patterns we will discuss are the singleton and shared instance patterns. We are discussing them together because they are extremely similar. First we will discuss shared instance, because it is the less strict form of the singleton pattern.

The idea of the shared instance pattern is that you provide an instance of your class to be used by other parts of your code. Let's look at a quick example of this in Swift:

class AddressBook {
    static let sharedInstance = AddressBook()

    func logContacts() {
        // ...
    }
}

Here, we have a simple address book class...

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