🔰Binding from StateObject

SwiftUI ⟩ Data Flow ⟩ Binding ⟩ create Binding from StateObject

💾 程式

📗 參考：SwiftOnTap ⟩ Binding ⭐️

// ⭐️ creating `Binding` from `@StateObject`
struct ExampleView: View {
    
    // ⭐️ `@StateObject` variable
    @StateObject private var viewModel = ExampleModel()

    var text: String {
        viewModel.isEnabled ? "Enabled" : "Disabled"
    }

    var body: some View {
        // ⭐️ $viewModel.isEnabled: Binding<Bool>
        // two-way connection to a source of truth
        //                 ╭─────── ⭐️ ───────╮
        Toggle(text, isOn: $viewModel.isEnabled)
    }
}

class ExampleModel: ObservableObject {
    // ⭐️ "published" source of truth:
    @Published var isEnabled: Bool = false
}

$viewModel.isEnabled and viewModel.$isEnabled are not equivalent. The former creates a Binding to isEnabled, whereas the latter unwraps the projected value of the @Published property wrapper wrapping isEnabled.

📘 手冊

• SwiftOnTap ⟩ Binding ⭐️

👥 相關

• StateObject