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

Exploring loops

In programming, you frequently need to do the same thing over and over again. For example, each month, a company will need to generate payroll slips for each employee. If the company has 10,000 employees, it would be inefficient to write 10,000 instructions to create the payroll slips. Repeating a single instruction 10,000 times would be better, and loops are used for this.

There are three types of loop; the for-in loop, the while loop, and the repeat-while loop. The for-in loop will repeat for a known number of times, and the while and repeat-while loops will repeat as long as the loop condition is true.

Important information

For more information on loops, visit

Let's look at each type in turn, starting with the for-in loop, which is used when you know how many times a loop should be repeated.

Using the for-in loop

The for-in loop steps through every value in a sequence, and a...