ios - 将字符串数组附加到正文的 Swift 多部分/表单数据上传(问题 : Array goes as String to Server)

Question

我尝试使用 Alamofire Swift 库在多部分请求中将字符串数组发送到服务器，我尝试了几种方法来对数组进行编码，但大多数时候它都是一个字符串。谁能帮我这个。除了数组发送图像上传和其他值可以正常发送到服务器。下面是我的代码。

var parameters: Parameters = [
        "UEmail": userObj.email,
        "UFirstName": fName,
        "ULastName": lName,
        "VisitedCountries": getVisitedCountryCodeList() //return String array
    ]

let headers: HTTPHeaders
    headers = ["Content-type": "multipart/form-data"]

    AF.upload(multipartFormData: { (multipartFormData) in
        for (key, value) in parameters {
            if let subArray = value as? NSArray {
                do {
                    if(key == "VisitedCountries"){
                        let data = try JSONSerialization.data(withJSONObject: self.getVisitedCountryCodeList(), options: [])
                        multipartFormData.append(data, withName: "VisitedCountries" )
                    }
                } catch {
                    print("error msg")
                }
            } else {
                multipartFormData.append((value as! NSString).data(using: String.Encoding.utf8.rawValue)!, withName: key )
            }
        }

        if(self.selectedProfileImage != nil){
            guard let imgData = self.selectedProfileImage.jpegData(compressionQuality: 2) else { return }
            multipartFormData.append(imgData, withName: "file", fileName: "image.jpeg", mimeType: "image/jpeg")
        }

    },usingThreshold: UInt64.init(),
      to: "\(Constants.SERVER_URL)\(Constants.USER_EDIT)",
      method: .post,
      headers: headers).response{ response in
        SVProgressHUD.dismiss()
        if(response.data != nil) {

            do {
                if let jsonData = response.data {
                    let parsedData = try JSONSerialization.jsonObject(with: jsonData) as! Dictionary<String, AnyObject>

                    print(parsedData)
                }

            } catch {
                print("error msg")
            }
        } else {
            print("user edit response2 \(response) end")
        }
    }

以上是我的 AF.upload 代码。数组追加是我有问题的部分。这是数组附加代码。

//getVisitedCountryCodeList() returns string array  

let data = try JSONSerialization.data(withJSONObject: self.getVisitedCountryCodeList(), options: []) 
multipartFormData.append(data, withName: "VisitedCountries" )

我也试过下面的代码

multipartFormData.append(try JSONEncoder().encode(self.getVisitedCountryCodeList()), withName: key )

下面是服务器得到的，是字符串不是数组

"VisitedCountries"=>"[\"ALG\",\"ARG\"]"

但我需要这样发送

"VisitedCountries"=> ["ALG","ARG"]

Answer 1

终于自己找到了答案，只需要对键值做一个小技巧即可。下面是代码。

for code in self.getVisitedCountryCodeList(){
    if let codeData = code.data(using: .utf8) {
        multipartFormData.append(codeData, withName: key+"[]" )
    }
}

key+"[]" 或 "VisitedCountries[]" 是这里的技巧，它会自动将其捕获为数组并向其添加下一个值。