When I make custom cluster marker on google map via swiftUI, create class CustomClusterRenderer: GMUDefaultClusterRenderer

Question

To override the renderer GMUDefaultClusterRenderer use the following code:

class CustomClusterRenderer: GMUDefaultClusterRenderer {
    override func renderer(_ renderer: GMUClusterRenderer, willRenderMarker marker: GMSMarker) {
    }
}

but the Xcode alarm method does not override any method from its superclass. If I write as:

func renderer(_ renderer: GMUClusterRenderer, willRenderMarker marker: GMSMarker)

There is no alarm, but when I execute the code, the programming never runs into this function.