Swift·Swift from optionals to SwiftUI

Build a lessons app

Fetch lessons, model states and render a SwiftUI list.

Beginner 22 min read Lesson 10 of 300 Challenge included

What you will be able to do

Decode into Identifiable models.
Model loading, error and content states.
Use List with stable ids.
Keep the network layer separate from the view.

In plain English

The capstone connects the language features to a UI. Fetch JSON, decode it into Identifiable models, keep loading and error states, and render a List with stable ids. Keep the service separate from the view so both are testable.

LessonsView.swiftSwift

struct LessonsView: View {
    @State private var lessons: [Lesson] = []

    var body: some View {
        List(lessons) { lesson in
            VStack(alignment: .leading) {
                Text(lesson.title).font(.headline)
                Text("(lesson.minutes) minutes").font(.caption)
            }
        }
        .task {
            lessons = (try? await LessonService().load()) ?? []
        }
    }
}

Your turn

Render a list

Easy

Render lessons in a List using their Identifiable conformance.

SWIFT · starter

List()

Check your understanding before moving on.

Knowledge checkQuestion 1

Which SwiftUI modifier runs async work tied to the view lifecycle?

Select an answer to continue

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Next: Drill 1: Summarise — Setup and syntax

Lesson 10 of 300 · 0% of course