MapBox iOS different marker images?

Is there a way to add an ID or something, that i am able to set custom marker images?

I have multiple markers with numbers, and i need that every new marker has another image.

For example:

marker1 - marker_1_image

marker2 - marker_2_image

Atm i am only able to set 1 image (globaly) to all markers:

func mapView(mapView: MGLMapView, imageForAnnotation annotation: MGLAnnotation) -> MGLAnnotationImage? {

    var annotationImage = mapView.dequeueReusableAnnotationImageWithIdentifier("place")

    if annotationImage == nil {
        var image = UIImage(named: "marker_1")!
        image = image.imageWithAlignmentRectInsets(UIEdgeInsetsMake(0, 0, image.size.height/2, 0))
        annotationImage = MGLAnnotationImage(image: image, reuseIdentifier: "place")
    }

    return annotationImage
}

Any ideas? Or can i subclass MGLAnnotation and use that for all delegate methods?