SwiftUI Data Flow @State

@State

@State is a property wrapper that stores a value locally in a view and updates the UI when the value changes.

Example

Demo.swift

ContentView.swift

App.swift

import SwiftUI

struct CounterView: View {
  @State private var count = 0
  var body: some View {
VStack(spacing: 12) {
  Text("Count: \(count)")
  Button("Increment") { count += 1 }
}
.padding()
  }
}