Book Image

iOS 14 Programming for Beginners - Fifth Edition

By : Ahmad Sahar
Book Image

iOS 14 Programming for Beginners - Fifth Edition

By: Ahmad Sahar

Overview of this book

If you're looking to work and experiment with powerful iOS 14 features such as widgets and App Clips to create your own apps, this iOS programming guide is for you. The book offers a comprehensive introduction for experienced programmers who are new to iOS, taking you through the entire process of learning the Swift language, writing your own apps, and publishing them on the App Store. Fully updated to cover the new iOS 14 features, along with Xcode 12 and Swift 5.3, this fifth edition of iOS 14 Programming for Beginners starts with an introduction to the Swift programming language and shows you how to accomplish common programming tasks with it. You'll then start building the user interface (UI) of a complete real-world app using the storyboards feature in the latest version of Xcode and implement the code for views, view controllers, data managers, and other aspects of mobile apps. The book will also help you apply iOS 14 features to existing apps and introduce you to SwiftUI, a new way to build apps for all Apple devices. Finally, you’ll set up testers for your app and understand what you need to do to publish your app on the App Store. By the end of this book, you'll not only be well versed in writing and publishing applications, but you’ll also be able to apply your iOS development skills to enhance existing apps.
Table of Contents (31 chapters)
1
Section 1: Swift
10
Section 2:Design
15
Section 3:Code
24
Section 4:Features

Understanding sets

Let's say you're writing a Movies app and you want to store a list of movie genres. You could do this with a set.

A set stores values in an unordered list. Here's what it looks like:

Figure 5.3 – Set

All values are of the same type.

If you create a set using the let keyword, its contents cannot be changed after it has been created. If you want to change the contents after creation, use the var keyword.

Let's look at how to work with sets. You'll create a set by assigning a value to it in the next section.

Creating a set

Imagine that you are creating a Movies app and you would like to store movie genres in your app. As you have seen for arrays and dictionaries, you can create a set by declaring it and assigning a new value to it. Add the following code to your playground and click the Play/Stop button to run it:

var movieGenres: Set = ["Horror", "Action", "Romantic...