使用 Content-Type 发出 Alamofire 请求：multipart/form-data

Posted 2023-02-24

【中文标题】使用 Content-Type 发出 Alamofire 请求：multipart/form-data

【英文标题】：making Alamofire Request with Content-Type: multipart/form-data

【发布时间】：2019-04-23 11:13:58

【问题描述】：

我想用 Alamofire 发出 post 请求，接收带有 Content-Type: multipart/form-data 的请求并接受有效负载文件在邮递员中并且它可以工作，注意在发出请求后我不希望回复它会是空的

  let body: [String:String] = [
                "id":"101",
                "message":test,
                "type":"test"
            ]

            let payload = [
                "payload":body
            ]

            let headers = [ "Content-Type" : "multipart/form-data"] 
            Alamofire.request("URL", method: .post, parameters:payload, encoding: JSONEncoding.default, headers: headers).responseObject  (response: DataResponse<ObjectEntity>) in
                guard (response.response?.statusCode == 200 || response.response?.statusCode == 204) else 
                    if response.response != nil 
                        self.showAPILogs(fullURL: self.getFullURL(methodName: methodName), response: response.response, statusCode: response.response!.statusCode)

                    
                    return
                
                self.showAPILogs(fullURL: self.getFullURL(methodName: methodName), response: response.response, statusCode: response.response!.statusCode)


            

【问题讨论】：

Send POST parameters with MultipartFormData using Alamofire, in ios Swift的可能重复

您在“multipartb/form-data”中有错字

但是如何发送带有访问令牌的标头？

使用alamofire的这个功能upload( multipartFormData: @escaping (MultipartFormData) -> Void, usingThreshold encodingMemoryThreshold: UInt64 = SessionManager.multipartFormDataEncodingMemoryThreshold, with urlRequest: URLRequestConvertible, encodingCompletion: ((SessionManager.MultipartFormDataEncodingResult) -> Void)?)

我收到“所需的请求部分'有效负载'不存在”

【参考方案1】：

试试

let body: [String: String] = [
        "id": "101",
        "message": test,
        "type": "test"
    ]
    Alamofire.upload(multipartFormData:  MultipartFormData in
        for (key, value) in body 
            MultipartFormData.append(value.data(using: String.Encoding.utf8)!, withName: key)
        
    , usingThreshold: UInt64.init(),
       to: "URL",
       method: .post,
       headers: ["Authorization": "Your access token"], // As per the web service requirement
       encodingCompletion:  encodingResult in
        switch encodingResult 
        case .success(let upload, _, _):
            upload.responseJSON  response in

            
        case .failure(let error):
            print(error)
        
    )

看看它是否有效。

【讨论】：

这样的工作我收到消息 = "所需的请求部分'有效负载'不存在";

在这种情况下，尝试将正文字典转换为 JSON 字符串并将其传递给有效负载，例如 let payload = [ "payload": "id": "101","message": test,"type ": "test" ] 并将 for-in 循环更改为 for (key, value) in payload MultipartFormData.append(value.data(using: String.Encoding.utf8)!, withName: key)

我正在努力将字典转换为 JSON 的部分，我不知道如何完成

如果让 jsonData = 试试？ JSONSerialization.data ( withJSONObject: bodyDictionary, options: [] ), let jsonString = String(data: jsonData, encoding: String.Encoding.utf8) print(“JSON String is: (jsonString)”)