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Learning Swift Second Edition

Learning Swift Second Edition

By : Andrew J Wagner
5 (1)
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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)
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13
Index

Allowing picture taking


Now we are ready to move onto the programming. The first thing we need to allow the user to do is to take a new picture. In order to do that, we are going to need some code to run every time the user taps on the add button. We achieve this by connecting the trigger action of the add button to a method on our view controller. Normally we make a connection by right-click dragging from the button to the code; however, we can't do this if we can't see the interface and the code at the same time. The easiest way to do this is to show the Assistant Editor. You can do this by navigating to View | Assistant Editor | Show Assistant Editor. Also, make sure it is configured to be automatic by clicking on the bar at the top of the editor:

This mode causes the second view to automatically change to the most appropriate file according to what you have selected on the left. In this case, because we are working with the interface of our view controller, it shows the code for the view...

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