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)

Fetching data from the web with URLSession

Retrieving data from the web is something that you will often do as an iOS professional. You won't just fetch data from a web service; you'll also send data back to it. For example, you might have to make an HTTP POST request as part of a login flow or to update a user's profile information. Over time, iOS has evolved quite a bit in the web requests department, making it easier to use web services in apps.

Important Note

HTTP (or HTTPS) is a protocol that almost all web traffic uses for communication between a client, such as an app, and a server. The HTTP protocol supports several methods that signal the request's intent. GET is used to retrieve information from a server. A POST request indicates the intention to push new content to a server, such as, for instance, when submitting a form.

When you want to perform a web request in iOS, you will typically use the URLSession class. The URLSession class makes asynchronous...