使用 Alamofire 上传图像的问题（将图像作为参数）答案

【问题标题】：Issue with uploading an image using Alamofire(has image as a parameter)使用 Alamofire 上传图像的问题（将图像作为参数）
【发布时间】：2017-10-10 07:39:56
【问题描述】：

这就是我尝试使用 Alamofire 上传图片的方式。但是程序崩溃说类似...'NSInvalidArgumentException', reason: '-[_SwiftTypePreservingNSNumber dataUsingEncoding:]: unrecognized selector sent to instance...我无法弄清楚确切的原因。这就是我提出请求的方式...

    for i in 1...(imageArray.count) {
        for img in imageArray {

            let url = "http://myapp.com/a/images_upload"
            let headers = [ "Content-Type":"application/x-www-form-urlencoded"]

  let imageData: Data = (UIImageJPEGRepresentation(img, 0.6) as Data?)!
            print(imageData)

            let parameters: [String: Any]  = [
                    "access_token":  commonVarForAccessToken,
                    "seller_id": idForNewOldUser, 
                    "product_id": self.productId,
                    "is_default": "1",
                    "sequence": i,
                    "image": imageData  ]

            Alamofire.upload(multipartFormData: { (multipartFormData) in
                print(parameters)

                multipartFormData.append(imageData as Data, withName: "home-\(self.index)", fileName: "home-\(self.index)", mimeType: "image/jpeg")

                for (key, value) in parameters {
                    print(key,value)

                    multipartFormData.append((value as AnyObject).data(using: String.Encoding.utf8.rawValue)!, withName: key)

                }
            }, to:url)
            { (result) in
                switch result {
                case .success(let upload, _, _):
                    upload.uploadProgress(closure: { (Progress) in
                        //Print progress
                    })
                    upload.responseJSON { response in

                        print(response.request)  // original URL request

                         if let JSON = response.result.value {
                            print("JSON: \(JSON)")
                        }

                    }
                case .failure(let encodingError):

                    print(encodingError)
                    break
                }}}}

希望有人可以提供帮助...谢谢...:)

【问题讨论】：

为什么要使用两次循环？
某处存在对dataUsingEncoding: 的（内部/隐藏）调用，该调用不起作用，因为该对象是(NS)Number 而不是(NS)Data。我会说是那条线：multipartFormData.append((value as AnyObject).data(using: String.Encoding.utf8.rawValue)!, withName: key)。你不能在任何类型的value 上做((value as AnyObject).data(using: String.Encoding.utf8.rawValue)。我不知道其他对象的类是什么，但"sequence": i, 应该会崩溃。
我也尝试给序列一个硬编码值“1”，但它再次崩溃，可能它不接受给定格式的图像...... imageData 只是显示为“403829 字节” ...这可能是个问题吗，@Larme ？
循环使用了两次，@AsaduzzamanShuvro 因为序列具有从图库中获取的图像数量，而另一个循环遍历每个拾取的图像...
使用我的答案stackoverflow.com/questions/45651187/… 只需传递图像，如 dict.set(imgview.image, forKey:"upload1") 如果您不上传视频，则将 nil 作为参数传递 @User.bw跨度>

标签： ios swift alamofire

【解决方案1】：

尝试使用此代码。它对我有用。

let para: [String: Any]

Alamofire.upload(multipartFormData: {(multipartFormData) in

for i in 0..<uploadImages.count{         multipartFormData.append(UIImageJPEGRepresentation(uploadImages[i], 0.3)!, withName: "image\(i)", fileName: "swift_file\(i).jpeg", mimeType: "image/jpg")             
        }

        for (key, value ) in para {
            multipartFormData.append((value).data(using: String.Encoding.utf8)!, withName: key)
        }
    }, to: apiURL)
    { (result) in
        switch result {
        case .success(let upload, _,_ ):

            upload.uploadProgress(closure: { (progress) in
                UILabel().text = "\((progress.fractionCompleted * 100)) %"
                print (progress.fractionCompleted * 100)
            })


            upload.responseJSON { response in

                guard ((response.result.value) != nil) else{
            print(response.result.error!.localizedDescription)
                    return
                }

【讨论】：