Book Image

iOS 15 Programming for Beginners - Sixth Edition

By : Ahmad Sahar, Craig Clayton
5 (1)
Book Image

iOS 15 Programming for Beginners - Sixth Edition

5 (1)
By: Ahmad Sahar, Craig Clayton

Overview of this book

With almost 2 million apps on the App Store, iOS mobile apps continue to be incredibly popular. Anyone can reach millions of customers around the world by publishing their apps on the App Store. iOS 15 Programming for Beginners is a comprehensive introduction for those who are new to iOS. It covers the entire process of learning the Swift language, writing your own app, and publishing it on the App Store. Complete with hands-on tutorials, projects, and self-assessment questions, this easy-to-follow guide will help you get well-versed with the Swift language to build your apps and introduce exciting new technologies that you can incorporate into your apps. You'll learn how to publish iOS apps and work with Mac Catalyst, SharePlay, SwiftUI, Swift concurrency, and much more. By the end of this iOS development book, you'll have the knowledge and skills to write and publish interesting apps, and more importantly, to use the online resources available to enhance your app development journey.
Table of Contents (32 chapters)
1
Part 1: Swift
10
Part 2: Design
15
Part 3: Code
25
Part 4: Features

Using the print() statement

As you have seen in Chapter 1, Getting Familiar with Xcode, an Xcode project does not have a Results area that a playground has, but both project and playground have a Debug area. Using the print() statement will print anything between the brackets to the Debug area.

Important Information

The print() statement is a function. You'll learn more about functions in Chapter 6, Functions and Closures.

Add the following code to your playground and click the Play/Stop button to run it:

print(ratingResult)

You'll see the value of ratingResult appear in the Debug area:

Figure 2.18: Debug area showing result of print() statement

When you're just starting out, feel free to use as many print() statements as you like. It's a really good way to understand what is happening in your program.