如何使用ViewModifier在swiftUI中将前景色可选地设置为视图

struct OptionalForegroundColor: ViewModifier {
    var color: Color?
    
    func body(content: Content) -> some View {
        if let color = color {
            return content.foregroundColor(color)
        } else {
            return content
        }
    }
}

struct ContentView: View {
    @State private var isForegroundEnabled = false
    
    var body: some View {
        Text("Hello, SwiftUI!")
            .modifier(OptionalForegroundColor(color: isForegroundEnabled ? .red : nil))
            .onTapGesture {
                self.isForegroundEnabled.toggle()
            }
    }
}