Book Image

iOS 12 Programming for Beginners - Third Edition

By : Craig Clayton
Book Image

iOS 12 Programming for Beginners - Third Edition

By: Craig Clayton

Overview of this book

Want to build iOS 12 applications from scratch with the latest Swift 4.2 language and Xcode 10 by your side? Forget sifting through tutorials and blog posts; this book is a direct route to iOS development, taking you through the basics and showing you how to put principles into practice. Take advantage of this developer-friendly guide and start building applications that may just take the App Store by storm! If you’re already an experienced programmer, you can jump right in and learn the latest iOS 12 features. For beginners, this book starts by introducing you to iOS development as you learn Xcode and Swift. You'll also study advanced iOS design topics, such as gestures and animations, to give your app the edge. You’ll explore the latest Swift 4.2 and iOS 12 developments by incorporating new features, such as the latest in notifications, custom-UI notifications, maps, and the recent additions in Sirikit. The book will guide you in using TestFlight to quickly get to grips with everything you need to get your project on the App Store. By the end of this book, you'll be ready to start building your own cool iOS applications confidently.
Table of Contents (27 chapters)
Free Chapter
1
Getting Familiar with Xcode

Control flow

In programming, control flow is the order in which your code executes. When working with Swift, we can use a variety of control statements. Loops, in particular, are useful for when you want to repeat a task multiple times. Let's take a look at a few different types of loop.

The for...in loop

One of the most common control statements is a for...in loop. It allows you to iterate over each element in a sequence. Let's see what a for...in loop looks like:

for <value> in <sequence> { 
 // Code here 
} 

We start the for...in loop with for, which is proceeded by <value>. <value> is a local constant (only the for...in loop can access it) and can be any name you like. Typically, you...