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)
Section 1: Swift
Section 2:Design
Section 3:Code
Section 4:Features

Chapter 3: Conditionals and Optionals

In the last chapter, you looked at data types, constants, variables, and operations. At this point, you are able to write simple programs that process letters and numbers. However, programs don't always proceed in sequence. Oftentimes, you will need to execute different instructions based on a condition. Swift allows you to do this by using conditionals, and you will learn how to use them in this chapter.

Another thing you may have noticed is that, in the last chapter, each variable or constant was immediately assigned a value. What if you require a variable where the value may not be present initially? You will need a way to create a variable that may or may not have a value. Swift allows you to do this by using optionals, and you will also learn about them in this chapter.

By the end of this chapter, you should be able to write programs that do different things based on different conditions, and to handle variables that may or may...