压缩Alamofire上传请求

Question

我的应用目前正在向我的服务器发送大量文件（我说~14Mo），但最终花费的时间比我想要的时间长。

我知道Alamofire会处理下载请求的压缩，但希望在上传时尝试实现此功能。

self.manager.upload(multipartFormData: { multipartFormData in
    let photo1Data = UIImagePNGRepresentation(self.client.gif!.frameImages![0])
    let photo2Data = UIImagePNGRepresentation(self.client.gif!.frameImages![1])
    let photo3Data = UIImagePNGRepresentation(self.client.gif!.frameImages![2])
    let photo4Data = UIImagePNGRepresentation(self.client.gif!.frameImages![3])
    let photo5Data = UIImagePNGRepresentation(self.client.gif!.frameImages![4])
    multipartFormData.append(photo1Data!, withName: "photo1", fileName: "photo1.png", mimeType: "image/png")
    multipartFormData.append(photo2Data!, withName: "photo2", fileName: "photo2.png", mimeType: "image/png")
    multipartFormData.append(photo3Data!, withName: "photo3", fileName: "photo3.png", mimeType: "image/png")
    multipartFormData.append(photo4Data!, withName: "photo4", fileName: "photo4.png", mimeType: "image/png")
    multipartFormData.append(photo5Data!, withName: "photo5", fileName: "photo5.png", mimeType: "image/png")
    multipartFormData.append(URL(fileURLWithPath: self.client.videoPath!), withName: "video", fileName: "video.mp4", mimeType: "video/mp4")
    if (self.client.firstname != nil) {
        multipartFormData.append(self.client.firstname!.data(using: String.Encoding.utf8)!, withName: "firstname")
    }
    if (self.client.lastname != nil) {
        multipartFormData.append(self.client.lastname!.data(using: String.Encoding.utf8)!, withName: "lastname")
    }
    if (self.client.age != nil) {
        multipartFormData.append(self.client.age!.data(using: String.Encoding.utf8)!, withName: "age")
    }
    if (self.client.email != nil) {
        multipartFormData.append(self.client.email!.data(using: String.Encoding.utf8)!, withName: "email")
    }
    if (self.client.male){
        multipartFormData.append("true".data(using: String.Encoding.utf8)!, withName: "male")
    } else {
        multipartFormData.append("false".data(using: String.Encoding.utf8)!, withName: "male")
    }
    if (self.client.newsletter){
        multipartFormData.append("true".data(using: String.Encoding.utf8)!, withName: "newsletter")
    } else {
        multipartFormData.append("false".data(using: String.Encoding.utf8)!, withName: "newsletter")
    }
}, to: url, method: .post, headers: nil, encodingCompletion: { encodingResult in
    switch encodingResult {
    case .success(let upload, _, _):
        let _ = upload.responseJSON(completionHandler: { (response) in
            if (response.response?.statusCode == 200) {
                do {
                    try FileManager.default.removeItem(at: URL(fileURLWithPath: self.client.videoPath!))
                } catch {
                    print("DID NOT DELETE VIDEO FILE")
                }
                self.client.delete()
            }
        })
        break
    case .failure(let encodingError):
        print("error:\(encodingError)")
        break
    }
})

其中client和gif是NSManagedObject继承并相互关联的。 gif帧存储在gif.frameImages属性中，生成的videoFile的filePath位于client.videoPath属性中。

在这种情况下有没有办法压缩multipartFormData？

我不想使用UIImageJPEGRepresentation，因为我希望服务器上的文件是真正的png。