Book Image

Mastering iOS 14 Programming - Fourth Edition

By : Mario Eguiluz Alebicto, Chris Barker, Donny Wals
Book Image

Mastering iOS 14 Programming - Fourth Edition

By: Mario Eguiluz Alebicto, Chris Barker, Donny Wals

Overview of this book

Mastering iOS 14 development isn’t a straightforward task, but this book can help you do just that. With the help of Swift 5.3, you’ll not only learn how to program for iOS 14 but also be able to write efficient, readable, and maintainable Swift code that reflects industry best practices. This updated fourth edition of the iOS 14 book will help you to build apps and get to grips with real-world app development flow. You’ll find detailed background information and practical examples that will help you get hands-on with using iOS 14's new features. The book also contains examples that highlight the language changes in Swift 5.3. As you advance through the chapters, you'll see how to apply Dark Mode to your app, understand lists and tables, and use animations effectively. You’ll then create your code using generics, protocols, and extensions and focus on using Core Data, before progressing to perform network calls and update your storage and UI with the help of sample projects. Toward the end, you'll make your apps smarter using machine learning, streamline the flow of your code with the Combine framework, and amaze users by using Vision framework and ARKit 4.0 features. By the end of this iOS development book, you’ll be able to build apps that harness advanced techniques and make the best use of iOS 14’s features.
Table of Contents (22 chapters)

Recognizing hand landmarks in real time

One of the additions to Vision in iOS 14 is hand detection. This new feature to detect hands in images and video allows developers to find with great detail the positions of the wrist and the individual fingers in a video frame or photo.

In this section, we are going to explain the basics behind hand detection, and we will demonstrate how it works with a sample project. Let's start with the hand landmarks that we will be able to recognize.

Understanding hand landmarks

There are 21 landmarks that we will be able to detect in a hand:

  • 4 in the thumb
  • 4 in each finger (16 in total)
  • 1 in the wrist

As you can see, Vision differentiates between finger and thumb. In both the finger and thumb, there are 4 points of interest. The following figure shows how these landmarks are distributed:

Figure 15.04 – Finger and thumb landmarks

Note how there is also a landmark in the middle of the...