📱 SwiftUIBeginneriOS 13+

@State & @Binding

Own simple view-local state with @State and share write access with child views through @Binding.

@State is the source of truth for simple values owned by a view — toggles, text field input, selected tabs. When it changes, SwiftUI re-renders the body.

Pass a $binding to a child view so it can read and write the parent's state without owning it.

state-and-binding.swift

1struct SettingsView: View {
2    @State private var notificationsOn = true
3
4    var body: some View {
5        Form {
6            NotificationToggle(isOn: $notificationsOn)
7            Text(notificationsOn ? "You'll get alerts" : "Muted")
8        }
9    }
10}
11
12struct NotificationToggle: View {
13    @Binding var isOn: Bool
14
15    var body: some View {
16        Toggle("Notifications", isOn: $isOn)
17    }
18}

Common pitfalls

Always mark @State private — it belongs to the view that declares it.
Do not use @State for data shared across screens; use an @Observable model in the environment.

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Common pitfalls

Still unclear? Ask BeeAI about @State & @Binding.

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