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

Implementing a basic drag and drop functionality


The previous section explained how drag and drop works from a theoretical point of view. This section focuses on implementing drag and drop in a sample app. First, you will learn how a simple, regular implementation of drag and drop might work. Next, you'll see how Apple has implemented drag and drop for UICollectionView and UITableView. These two components have received special treatment for drag and drop, making it even easier to implement drag and drop in apps that use these components.

 

Adding drag and drop to a plain UIView

Before you implement drag and drop in the Augmented Reality gallery, let's see how you can implement a simple version of drag and drop with a simple view and an image. In the code bundle for this chapter, you'll find a sample project named PlainDragDrop. Open the starting version for this project and run it on an iPad simulator. You should see the user interface shown in the following screenshot:

The goal of this example...