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)

Developing your first widget

In this section, we will use an existing app to create a widget on top of it step by step.

The app that we will work on is a crypto ticker, in which the user can check the latest prices of different cryptocurrencies. We will create a widget that will allow users to glance at crypto prices from their home screen, so they don't have to open the app itself.

Go ahead and open the project named CryptoWidget_start from the code bundle of this chapter. This is the base project on top of which we will build our widget. Before jumping into the task, let's do a quick review of the base project itself.

Build and launch the project. The app displays a list of cryptocurrencies' prices:

Figure 16.2 – Base app

You can also go into a detailed view of each coin, but just for demo purposes, it doesn't contain additional info. As we are going to work with an existing code base, let's highlight some key points...