从集群中删除标记后，集群管理器未刷新。以较旧的图像作为标记

Question

这是我用于实现集群的代码。从第一步开始。请让我知道以下代码是否有错误。

var clusterManager: GMUClusterManager?
var clusterItems : [POIItem] = []

 func removeMarker(userId : Double){

for (index,item) in clusterItems.enumerated(){
    if item.participantUserId == userId{
        clusterItems.remove(at: index)
        clusterManager?.remove(item)
    }
}
clusterManager?.cluster()
 }

这是该方法的委托方法

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

    if let poiItem = marker.userData as? POIItem {

        if participantImageView == nil{
            participantImageView = RideParticipantsImageView.loadFromNibNamed(nibNamed: "RideParticipantImageView") as? RideParticipantsImageView
        }
        participantImageView!.participantImageView.image = poiItem.image
        marker.icon = ViewCustomizationUtils.getImageFromView(view: participantImageView!)

        for rideParticipantLocation in rideParticipantLocationObject{

            if poiItem.participantUserId == rideParticipantLocation.userId!{

                if isLocationUpdateExpired(ridePartcipantLocation: rideParticipantLocation){
                    marker.opacity = GoogleMapUtils.MARKER_HALF_OPACITY
                }else{
                    marker.opacity = GoogleMapUtils.MARKER_FULL_OPACITY
                }
            }
        }
     marker.zIndex = 11
    }

}

但是群集没有刷新，并且为群集图标拍摄了旧尺寸和新尺寸的图像。

class CustomizedCusterIconGenerator: GMUDefaultClusterIconGenerator{

var markerView: RideParticipantsCountView?

override func icon(forSize size: UInt) -> UIImage {
    if size == 2{
        let image = UIImage(named : "cluster_image1")
        return image!
    }
    else if size == 3{
        let image = UIImage(named : "cluster_image2")
        return image!
    }
    else if size == 4{
        let image = UIImage(named : "cluster_image3")
        return image!
    }
    else if size == 5{
        let image = UIImage(named : "cluster_image4")
        return image!
    }
    else{
        self.markerView = RideParticipantsCountView.loadFromNibNamed(nibNamed: "RideParticipantsCountView") as? RideParticipantsCountView
        markerView?.setMarker(count: size)
      UIGraphicsBeginImageContextWithOptions(markerView!.frame.size,false, 0)
        markerView!.layer.render(in: UIGraphicsGetCurrentContext()!)
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return image!
    }
}

}

如果上面的代码中有任何错误。请帮忙。