Book Image

An iOS Developer's Guide to SwiftUI

By : Michele Fadda
Book Image

An iOS Developer's Guide to SwiftUI

By: Michele Fadda

Overview of this book

– SwiftUI transforms Apple Platform app development with intuitive Swift code for seamless UI design. – Explore SwiftUI's declarative programming: define what the app should look like and do, while the OS handles the heavy lifting. – Hands-on approach covers SwiftUI fundamentals and often-omitted parts in introductory guides. – Progress from creating views and modifiers to intricate, responsive UIs and advanced techniques for complex apps. – Focus on new features in asynchronous programming and architecture patterns for efficient, modern app design. – Learn UIKit and SwiftUI integration, plus how to run tests for SwiftUI applications. – Gain confidence to harness SwiftUI's full potential for building professional-grade apps across Apple devices.
Table of Contents (25 chapters)
Free Chapter
1
Part 1: Simple Views
5
Part 2: Scrollable Views
8
Part 3: SwiftUI Navigation
11
Part 4: Graphics and Animation
14
Part 5: App Architecture
17
Part 6: Beyond Basics

A matter of state

This is intended as a convenient recap to give you a summary of all the ways SwiftUI allows you to share state.

SwiftUI offers various mechanisms to bind state changes to views, including @State, @Binding, @ObservedObject, @StateObject, and @EnvironmentObject (@Environment is used for system predefined values you want to observe). Let’s go over these mechanisms in more detail:

  • @State: This property wrapper stores mutable state for a specific view. SwiftUI manages the storage and ensures that whenever the state changes, the view is re-displayed. It’s used for simple, private state management within a single view.

    Here’s an example:

    struct ContentView: View {
        @State private var isOn = false
        var body: some View {
            Toggle("Toggle", isOn: $isOn)
        }
    }

    The @State variable, isON, is bidirectionally bound to the value...