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

Exploring data types

All programming languages can store numbers, logic states, and words, and Swift is no different. Even if you're an experienced programmer, you may find that Swift represents these objects differently from other languages that you may be familiar with.

Important Information

For more information on data types, visit: https://docs.swift.org/swift-book/LanguageGuide/TheBasics.html.

Let's walk through the Swift versions of integers, floating-point numbers, Booleans, and strings, in the next sections.

Representing integers

Let's say you want to store the following:

  • The number of restaurants in a city
  • Passengers in an airplane
  • Rooms in a hotel

You would use integers, which are numbers without a fractional component (including negative numbers).

Integers in Swift are represented by the Int type.

Representing floating-point numbers

Let's say you want to store the following:

  • Pi (3.14159...)
  • ...