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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

Permanently saving a photo


Our app works pretty well for saving pictures, but as soon as the app quits, all of the photos are lost. We need to add a way to save the photos permanently. Our refactoring of the code allows us to work primarily within the model layer now.

Before we write any code, we have to decide how we are going to store the photos permanently. There are many ways in which we can choose to save the photos, but one of the easiest is to save it to the file system, which is what we conceived of in our conception phase. Every app is provided a documents directory that is automatically backed up by the operating system as a part of normal backups. We can store our photos in there as files named after the label the user gives them. To avoid any problems with duplicate labels, where we would have multiple files named the same thing, we can nest every file inside a subdirectory named after the time the photos is saved. The time stamp will always be unique because we will never save...

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