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

Responding to a button tap

In this section, we will begin making a view responsive by examining the simplest case; that is, building a view that needs to respond to a simple user event, a button tap, and changing the view appearance in response.

Let’s start by trying to write the first thing that would intuitively come to mind; let’s change a variable’s value and have the view respond to that value change, as shown in the following code example:

import SwiftUI
struct MyViewStruct: View {
    var name = "Mary"
    var body: some View {
        VStack(spacing: 20) {
            Text("Variables in structs are immutable")
                .fontWeight(.heavy)
           ...