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

Deciding which type you should use


Choosing the wrong type of object to use in your application can have bad implications for your app on several levels. For instance, your app could suffer from unwanted side-effects when a reference type is modified in some unexpected place. Or you could end up with a lot of duplicated logic if you use a struct instead of a class in certain places. Your app could even suffer in terms of performance when you choose a slow reference type where a value type would have been a better choice. You should always evaluate what type of object is best-suited for your current use case to make sure your code strikes a balanced trade-off between maintainability and performance.

When to use a reference type?

A great time to use a reference type is when you are subclassing a built-in class, such as UIViewController. In these cases, there is no point in fighting the system because that would definitely do more harm than good. Another time to use a reference type is when you...