Sign In Start Free Trial
Account

Add to playlist

Create a Playlist

Modal Close icon
You need to login to use this feature.
  • Book Overview & Buying Learning Swift Second Edition
  • Table Of Contents Toc
  • Feedback & Rating feedback
Learning Swift Second Edition

Learning Swift Second Edition

By : Andrew J Wagner
5 (1)
close
close
Learning Swift Second Edition

Learning Swift Second Edition

5 (1)
By: Andrew J Wagner

Overview of this book

Swift is Apple’s new programming language and the future of iOS and OS X app development. It is a high-performance language that feels like a modern scripting language. On the surface, Swift is easy to jump into, but it has complex underpinnings that are critical to becoming proficient at turning an idea into reality. This book is an approachable, step-by-step introduction into programming with Swift for everyone. It begins by giving you an overview of the key features through practical examples and progresses to more advanced topics that help differentiate the proficient developers from the mediocre ones. It covers important concepts such as Variables, Optionals, Closures, Generics, and Memory Management. Mixed in with those concepts, it also helps you learn the art of programming such as maintainability, useful design patterns, and resources to further your knowledge. This all culminates in writing a basic iOS app that will get you well on your way to turning your own app ideas into reality.
Table of Contents (14 chapters)
close
close
13
Index

Control flow

A program wouldn't be very useful if it were a single fixed list of commands that always did the same thing. With a single code path, a calculator app would only be able to perform one operation. There are a number of things we can do to make an app more powerful and collect the data to make decisions as to what to do next.

Conditionals

The most basic way to control the flow of a program is to specify code that should only be executed if a certain condition is met. In Swift, we do that with an if statement. Let's look at an example:

if invitees.count > 20 {
   print("Too many people invited")
}

Semantically, the preceding code reads; if the number of invitees is greater then 20, print 'Too many people invited". This example only executes one line of code if the condition is true, but you can put as much code as you like inside the curly brackets ({}).

Anything that can be evaluated as either true or false can be used in an if statement. You can then...

Unlock full access

Continue reading for free

A Packt free trial gives you instant online access to our library of over 7000 practical eBooks and videos, constantly updated with the latest in tech
bookmark search playlist font-size

Change the font size

margin-width

Change margin width

day-mode

Change background colour

Close icon Search
Country selected

Close icon Your notes and bookmarks

Delete Bookmark

Modal Close icon
Are you sure you want to delete it?
Cancel
Yes, Delete

Confirmation

Modal Close icon
claim successful

Buy this book with your credits?

Modal Close icon
Are you sure you want to buy this book with one of your credits?
Close
YES, BUY