🔸binding

SwiftUI ⟩ view ⟩ state ⟩ binding

A binding connects a property to a source of truth stored elsewhere.

Add @Binding to create a two-way connection between a property that stores data, and a view that displays and changes the data.

💾 程式

struct ContainerView: View {
    
    // ⭐️ container's view state (source of truth)
    @State var isOn = false
    
    var body: some View {
        VStack {
            // ⭐️ 在 subview (Toggle) 中使用 binding ($isOn)
            Toggle("Press Me", isOn: $isOn)
        }
    }
}

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