📱 SwiftUIIntermediateiOS 15+

.task & Loading Data

Start async work when a view appears — automatically cancelled when it disappears.

.task runs an async closure tied to the view's lifetime. It is the right place to load data, replacing onAppear + Task { }.

Use .task(id:) to restart the work whenever a value changes, such as a search query.

task-modifier.swift

1struct Post: Decodable, Identifiable { let id: Int; let title: String }
2
3struct PostsView: View {
4    @State private var posts: [Post] = []
5    @State private var errorMessage: String?
6
7    var body: some View {
8        List(posts) { Text($0.title) }
9            .overlay { if let errorMessage { Text(errorMessage) } }
10            .task { await load() }
11    }
12
13    private func load() async {
14        do {
15            let url = URL(string: "https://jsonplaceholder.typicode.com/posts")!
16            let (data, _) = try await URLSession.shared.data(from: url)
17            posts = try JSONDecoder().decode([Post].self, from: data)
18        } catch {
19            errorMessage = error.localizedDescription
20        }
21    }
22}

Common pitfalls

Always handle errors and show a state to the user — never leave an infinite spinner.

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Common pitfalls

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