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In this chapter, we'll learn how to manage the state of single or multiple views. In the declarative world of SwiftUI, you should consider views as functions of their state, whereas in the imperative world of UIKit, you should tell a view what it must do depending on the state. In SwiftUI, views react to changes. SwiftUI has three ways of reaching these goals:

• Using the binding property wrappers that SwiftUI provides
• Using Observation, a new framework introduced in iOS 17
• Using Combine, the framework that Apple introduced to implement functional reactive programming

We will learn about the first two mechanisms in this chapter and in Chapter 11, Driving SwiftUI with Combine, we'll learn how to use Combine to drive changes in SwiftUI views.Property wrappers are a way to decorate a property and were introduced in Swift 5.1. There are four different ways of using the binding property wrappers in SwiftUI:

• @State...