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我试图将标记或图钉图像更改为我使用 alamofireimage 从 firebase 下载的图像。请我需要帮助

这是我的代码：

let coordinates = CLLocationCoordinate2D(latitude: milatitud!, longitude: milongitud!)


        let annotation = MKPointAnnotation()

        annotation.coordinate = coordinates
        annotation.title = "JuanJo"
        self.map.addAnnotation(annotation)

        //print ("4444444444")


        for annotation: MKAnnotation in self.map.annotations {

            let anView = self.map.view(for: annotation)

            if (anView != nil)


            {
                let url = URL(string: link!)
                self.imagen.af_setImage(withURL: url!, placeholderImage: UIImage(named: "usuarioprevia.jpeg"), filter: CircleFilter(), imageTransition: .crossDissolve(0.5), runImageTransitionIfCached: true, completion: nil)

                anView?.image = "image downloaded from firebase with alamofireimage"









            }

我不知道最后一部分如何设置它=用于显示图像，我还需要调整它的大小。请帮忙

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