How to conditionally apply an accessibility action?

SwiftUI has the handy .accessiblityAction() ViewModider that adds an accessibility action to a view that you are creating. Keyboard users and VO users can learn about the actions attached to the View and trigger them.

I want to be able to conditionally apply an action based on a boolean. Something like this:

Button {
    print("Button tapped")
} label: {
    Text("Button title")
}
if addActionToButton.wrappedValue {
    .accessibilityAction(named: "Button action") {
        print("Button action triggered")
    }
}

You can't put a ViewModifier like accessibilityAction inside an if statement however.

.accessibilityLabel has a variant that takes an isEnabled parameter. When the isEnabled condition is false, it does not apply the accessibility label:

@State addA11Label: Bool

Button {
    print("Button tapped")
} label: {
    Text("Button title")
}
.accessibilityLabel("Button foo. Double-tap to do stuff.", isEnabled: addA11Label.wrappedValue)

I want a accessibilityAction isEnabled parameter, but no such luck.

How could I conditionally add an accessibilityAction to my Button (or other view)?

You could create a custom view extension that uses @ViewBuilder to add the action only when a specified Boolean is true.

Example:

import SwiftUI

extension View {
    @ViewBuilder
    func conditionalAccessibilityAction(
        _ condition: Bool,
        name: String,
        perform action: @escaping () -> Void
    ) -> some View {
        if condition {
            self.accessibilityAction(named: name, perform: action)
        } else {
            self
        }
    }
}

struct ContentView: View {
    @State private var addActionToButton: Bool = true

    var body: some View {
        VStack {
            Button {
                print("Button tapped")
            } label: {
                Text("Button Title")
            }
            .conditionalAccessibilityAction(
                addActionToButton,
                name: "Button action"
            ) {
                print("Button action triggered")
            }
            
            Toggle("Add Accessibility Action", isOn: $addActionToButton)
                .padding()
        }
        .padding()
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

The extension would check the boolean and apply .accessibilityAction(named:perform:) if the condition is met, otherwise it leaves the view unchanged.