Book Image

SwiftUI Cookbook - Second Edition

By : Giordano Scalzo, Edgar Nzokwe
Book Image

SwiftUI Cookbook - Second Edition

By: Giordano Scalzo, Edgar Nzokwe

Overview of this book

SwiftUI provides an innovative and simple way to build beautiful user interfaces (UIs) for all Apple platforms, from iOS and macOS through to watchOS and tvOS, using the Swift programming language. In this recipe-based cookbook, you’ll cover the foundations of SwiftUI as well as the new SwiftUI 3 features introduced in iOS 15 and explore a range of essential techniques and concepts that will help you through the development process. The cookbook begins by explaining how to use basic SwiftUI components. Once you’ve learned the core concepts of UI development, such as Views, Controls, Lists, and ScrollViews, using practical implementations in Swift, you'll advance to adding useful features to SwiftUI using drawings, built-in shapes, animations, and transitions. You’ll understand how to integrate SwiftUI with exciting new components in the Apple development ecosystem, such as Combine for managing events and Core Data for managing app data. Finally, you’ll write iOS, macOS, and watchOS apps by sharing the same SwiftUI codebase. By the end of this SwiftUI book, you'll have discovered a range of simple, direct solutions to common problems encountered when building SwiftUI apps.
Table of Contents (17 chapters)

Fetching remote data using Combine and visualizing it in SwiftUI

A common characteristic that most mobile apps have is that they fetch data from a remote web service. Given the asynchronous nature of the problem, it is often problematic when this is implemented in the normal imperative world. However, it suits the reactive world nicely, as we'll see in this recipe.

We are going to implement a simple weather app, fetching the current weather and a 5-day forecast from OpenWeather, a famous service that also has a free tier.

After fetching the forecast, we will present the results in a list view, with the current weather fixed on the top.

Getting ready

We will start by creating a SwiftUI app called Weather.

To use this service, we must create an account on OpenWeather:

Figure 10.7 – OpenWeather signup page

  • After confirming...