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)

Manipulating photos with Core Image

In this chapter, you have already seen that iOS has powerful capabilities for recording and playing media. In this section, you will learn how you can manipulate images with Core Image. The Core Image framework provides many different filters that you can use to process both images and videos. You will expand on the photo-taking capabilities that you implemented in the Captured app so that users can grayscale and crop images.

Every Core Image filter you apply to images is an instance of the CIFilter class. You can create instances of filters as follows:

let filter = CIFilter(name: "CIPhotoEffectNoir")

The name parameter in the filter's initializer is expected to be a string that refers to a specific filter. You can refer to Apple's documentation on Core Image and the Core Image Filter Reference guide to see an overview of all the filters that you can use in your apps.

Every filter has a certain set of parameters that...