MapBox iOS:如何根据缩放级别改变间距？

func mapView(_ mapView: MGLMapView, regionDidChangeAnimated animated: Bool) {
    let zoomLevel = mapView.zoomLevel
    // 在这里根据缩放级别进行相应的操作
}

func mapView(_ mapView: MGLMapView, regionDidChangeAnimated animated: Bool) {
    let zoomLevel = mapView.zoomLevel
    if zoomLevel < 10 {
        // 缩放级别小于10时，调整地图的显示范围
        mapView.setVisibleCoordinateBounds(MGLCoordinateBounds(sw: CLLocationCoordinate2D(latitude: 40, longitude: -74), ne: CLLocationCoordinate2D(latitude: 41, longitude: -73)), animated: true)
    } else {
        // 缩放级别大于等于10时，调整标记物的大小
        mapView.annotations.forEach { annotation in
            if let markerAnnotation = annotation as? MGLMarkerAnnotation {
                markerAnnotation.iconSize = CGSize(width: 20, height: 20)
            }
        }
    }
}