Book Image

Mastering iOS 12 Programming - Third Edition

By : Donny Wals
Book Image

Mastering iOS 12 Programming - Third Edition

By: Donny Wals

Overview of this book

The iOS development environment has significantly matured, and with Apple users spending more money in the App Store, there are plenty of development opportunities for professional iOS developers. However, the journey to mastering iOS development and the new features of iOS 12 is not straightforward. This book will help you make that transition smoothly and easily. With the help of Swift 4.2, you’ll not only learn how to program for iOS 12, but also how to write efficient, readable, and maintainable Swift code that maintains industry best practices. Mastering iOS 12 Programming will help you build real-world applications and reflect the real-world development flow. You will also find a mix of thorough background information and practical examples, teaching you how to start implementing your newly gained knowledge. By the end of this book, you will have got to grips with building iOS applications that harness advanced techniques and make best use of the latest and greatest features available in iOS 12.
Table of Contents (35 chapters)
Title Page
Copyright and Credits
Dedication
Packt Upsell
Contributors
Preface
Index

Chapter 10. Being Proactive with Background Fetch

So far, the MustC application is shaping up quite nicely. You can add family members and associate movies with them, and these movies are automatically enriched with the first rating available from the movie database API. You may still have some movies in your app that were added earlier and don't have a rating, although the ratings for the existing movies might be correct for now, they might not be correct in a couple of days, weeks, or months from now. You could update the ratings whenever the user accesses them, but it's not very efficient to do this. You might reload the same movie a couple of times in a single session, which isn't very useful.

Ideally, the movies would be updated in the background, when the user isn't using the app. Functionality such as this can be implemented using background fetch. This chapter is all about fetching data on behalf of the user while the app isn't active in the foreground. Implementing this feature can...