SwiftUI AppStorage & SceneStorage

SwiftUI AppStorage & SceneStorage

Persist small values with @AppStorage and view-state per scene with @SceneStorage.

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@AppStorage (User Defaults)

Bind a value directly to UserDefaults so changes persist across app launches.

Syntax: @AppStorage("key") var value: T = default

Example

Demo.swift

ContentView.swift

App.swift

import SwiftUI

struct AppStorageDemo: View {
  @AppStorage("username") private var username = ""
  var body: some View {
VStack(spacing: 12) {
  Text("Hello, \(username.isEmpty ? "Guest" : username)")
  TextField("Username", text: $username)
    .textFieldStyle(.roundedBorder)
}
.padding()
  }
}

This example stores the username in UserDefaults and keeps the UI in sync.

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@SceneStorage (Per-Scene UI State)

Preserve transient UI data (like a draft) per window/scene; state is restored when the scene returns.

Syntax: @SceneStorage("key") var value: T

Example

Demo.swift

ContentView.swift

App.swift

import SwiftUI

struct SceneStorageDemo: View {
  @SceneStorage("draft_note") private var draft = ""
  var body: some View {
VStack(alignment: .leading, spacing: 8) {
  Text("Draft:")
  TextEditor(text: $draft)
    .frame(minHeight: 120)
    .overlay(RoundedRectangle(cornerRadius: 6).stroke(.secondary))
}
.padding()
  }
}