Book Image

Learn Swift by Building Applications

By : Emil Atanasov, Giordano Scalzo, Emil Atanasov
Book Image

Learn Swift by Building Applications

By: Emil Atanasov, Giordano Scalzo, Emil Atanasov

Overview of this book

Swift Language is now more powerful than ever; it has introduced new ways to solve old problems and has gone on to become one of the fastest growing popular languages. It is now a de-facto choice for iOS developers and it powers most of the newly released and popular apps. This practical guide will help you to begin your journey with Swift programming through learning how to build iOS apps. You will learn all about basic variables, if clauses, functions, loops, and other core concepts; then structures, classes, and inheritance will be discussed. Next, you’ll dive into developing a weather app that consumes data from the internet and presents information to the user. The final project is more complex, involving creating an Instagram like app that integrates different external libraries. The app also uses CocoaPods as its package dependency manager, to give you a cutting-edge tool to add to your skillset. By the end of the book, you will have learned how to model real-world apps in Swift.
Table of Contents (14 chapters)
5
Adding Interactivity to Your First App

Enumeration types

In Swift, we can define simple types which have limited possible different values. These types are enumerations. We define them with the keyword enum. The following code is an example of this:

enum AnEnumeration {
// the value definitions goes here
}

Here's another code that does this:

enum GameInputDevice 
case keyboard, joystick, mouse
}

The code has three different enumeration cases. All cases may appear on a single line, such as in the preceding code, or even one by one on a line.

We can meet the following notation, because Swift infers the missing part:

var input = GameInputDevice.mouse
//...
//later in the code
input = .joystick
The code bundle for the book is hosted on GitHub at https://github.com/PacktPublishing/Learn-Swift-by-Building-Applications. In case there's an update to the code, it will be updated on the existing GitHub repository.