Book Image

Animating SwiftUI Applications

By : Stephen DeStefano
Book Image

Animating SwiftUI Applications

By: Stephen DeStefano

Overview of this book

Swift and SwiftUI are the backbone of Apple application development, making them a crucial skill set to learn. Animating SwiftUI Applications focuses on the creation of stunning animations, making you proficient in this declarative language and employing a minimal code approach. In this book, you'll start by exploring the fundamentals of SwiftUI and animation, before jumping into various projects that will cement these skills in practice. You will explore some simple projects, like animating circles, creating color spectrums with hueRotation, animating individual parts of an image, as well as combining multiple views together to produce dynamic creations. The book will then transition into more advanced animation projects that employ the GeometryReader, which helps align your animations across different devices, as well as creating word and color games. Finally, you will learn how to integrate the SpriteKit framework into our SwiftUI code to create scenes with wind, fire, rain, and or snow scene, along with adding physics, gravity, collisions, and particle emitters to your animations. By the end of this book, you’ll have created a number of different animation projects, and will have gained a deep understanding of SwiftUI that can be used for your own creations.
Table of Contents (18 chapters)

Creating the Picker view

To create the Picker view, let’s make a new SwiftUI View file called PickerView for this purpose.

Inside this file, we need to add a Binding property so that we can use it inside ContentView, as well as add an array of titles for the picker:

    @Binding var selectedPickerIndex: Int
    @State var levels = ["Easy 😌", "Hard 😓", "Extreme! 
      🥵"]

The code here has a Binding variable to hold the value of selectedPickerIndex; that way, we can keep track of which button on the picker the user has selected. Then, we have a State array of titles that we will use on the individual picker buttons, along with an appropriate emoji signifying the difficulty level.

Next, as we’ve done before, update the Previews struct with some dummy data, to satisfy Xcode:

struct PickerView_Previews: PreviewProvider {
  ...