SwiftUI State and Data Flow
Understanding of how to handle App State and Data update in SwiftUI
Introduction to SwiftUI State
State is a crucial aspect of SwiftUI that represents the current data within the view. When state properties change, SwiftUI automatically updates the UI to reflect the new values. You use the @State property wrapper to define state properties.
import SwiftUI
struct ContentView: View {
@State private var count = 0
var body: some View {
VStack {
Text("Count: \(count)")
Button("Increment") {
count += 1
}
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
In this example, we define a count state property using @State. When the “Increment” button is tapped, the count value increases, and SwiftUI automatically updates the Text view to reflect the new value.
Two-Way Data Binding with @Binding
@Binding is used for two-way data binding, where the parent view passes a value to a child view, and any changes to the child view’s value are reflected back to the parent view.
import SwiftUI
struct ContentView: View {
@State private var isOn = false
var…