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Showing and hiding form rows

Paul Hudson    @twostraws   

Fully updated for Xcode 11 GM

SwiftUI lets us add and remove items from a form as needed, which is particularly helpful when you want to adjust the list of options that are visible based on previous choices.

For example, this shows a single toggle that prompts the user whether they want to show more advanced options. When that toggle is enabled, a second toggle appears allowing them to enable logging:

struct ContentView: View {
    @State private var showingAdvancedOptions = false
    @State private var enableLogging = false

    var body: some View {
        Form {
            Section {
                Toggle(isOn: $showingAdvancedOptions) {
                    Text("Show advanced options")
                }

                if showingAdvancedOptions {
                    Toggle(isOn: $enableLogging) {
                        Text("Enable logging")
                    }
                }
            }
        }
    }
}

As with other bindings, you can ask SwiftUI to use implicit animations for view changes made as a result of a binding change, like this:

Toggle(isOn: $showingAdvancedOptions.animation()) {
    Text("Show advanced options")
}

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