/*dropPin中的retrieveUrls修改retrieveImages

       retrieveUrls(forAnnotation: annotation) { (finished) in//如果完成loading的話removeSpinner()與removeProgressLbl()
            if finished {
                self.retrieveImages(handler: { (finished) in
                    if finished {
                        self.removeSpinner()
                        self.removeProgressLbl()
                        // reload collectionView'

                    }
                })
            }*/

    func retrieveImages(handler: @escaping (_ status: Bool) -> ()) {
        imageArray = []

        for url in imageUrlArray {
            Alamofire.request(url).responseImage(completionHandler: { (response) in
                guard let image = response.result.value else { return }
                self.imageArray.append(image)
                self.progressLbl?.text = "\(self.imageArray.count)/40 IMAGES DOWNLOADED"

                if self.imageArray.count == self.imageUrlArray.count {
                    handler(true)
                }
            })
        }
    }