Book Image

SwiftUI Cookbook

By : Giordano Scalzo, Edgar Nzokwe
Book Image

SwiftUI Cookbook

By: Giordano Scalzo, Edgar Nzokwe

Overview of this book

SwiftUI is an innovative and simple way to build beautiful user interfaces (UIs) for all Apple platforms, right from iOS and macOS through to watchOS and tvOS, using the Swift programming language. In this recipe-based book, you’ll work with SwiftUI and explore a range of essential techniques and concepts that will help you through the development process. The recipes cover the foundations of SwiftUI as well as the new SwiftUI 2.0 features introduced in iOS 14. Other recipes will help you to make some of the new SwiftUI 2.0 components backward-compatible with iOS 13, such as the Map View or the Sign in with Apple View. The cookbook begins by explaining how to use basic SwiftUI components. Then, you’ll learn the core concepts of UI development such as Views, Controls, Lists, and ScrollViews using practical implementation in Swift. By learning drawings, built-in shapes, and adding animations and transitions, you’ll discover how to add useful features to the SwiftUI. When you’re ready, 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 while 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 found in building SwiftUI apps.
Table of Contents (15 chapters)

Building a bar chart

Using simple shapes, it is possible to build some nice features. For example, using just a bunch of rectangles, we can create a nice bar chart.

We are going to present the average monthly precipitation for three European cities: Dublin, Milan, and London. The data that we'll use is from

Getting ready

This recipe doesn't need any external resources, so it's enough to create a SwiftUI project called BarChartApp.

How to do it...

The data we have represents the average quantity of rain in centimeters. Looking at the data, we can see that the maximum rainfall is one centimeter, so we can adapt the bars to have a full shape for that value.

Let's implement our bar chart as follows:

  1. Add enum to represent the months and a datapoint value type to hold the values to plot on the bar chart:
    enum Month: String, CaseIterable {
        case jan, feb, mar, apr, may, jun,