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SwiftUI Cookbook

SwiftUI Cookbook

By : Giordano Scalzo, Nzokwe
4.3 (20)
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SwiftUI Cookbook

SwiftUI Cookbook

4.3 (20)
By: Giordano Scalzo, 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)
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Building a pie chart

We know that a pie chart is a way to represent proportional numeric values by using slices that form a circle – a pie. With a pie chart being made up of a slice and a circle – simple geometric shapes – it is simple enough to implement them in SwiftUI.

This recipe will use a dataset based on the number of pets in three different European cities. Unlike the previous recipe, the data here has been made up.

Getting ready

This recipe doesn't have any external resources, so it is enough just to create a SwiftUI project called PieChart.

How to do it…

This recipe is slightly more complicated than usual because it has two main parts:

  • Manipulating datapoints
  • Visualizing datapoints

The datapoints value must be adjusted by finding the maximum value and adapting the others to fit the chart. Also, we must calculate the angles for each slice – the starting angle (which is the ending angle of the previous...

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