如何在Swift 3中使用PUT方法发布数据？[副本]

Question

这里，我需要使用put方法将数据发送到服务器，但我无法发送它，它在Postman中运行良好。我的json函数是不是错了，如果它是错的，有人能帮我如何实现这个吗？

func itemsIncrementingandDecrementingtocartDownloadJsonWithURL(itemsApi: String){
        print(itemsApi)
        let url = URL(string: itemsApi)
        var request = URLRequest(url: url! as URL)
        request.httpMethod = "PUT"
        let parameters : [String: Any] = ["cartItem":
            [
                "item_id": itemId!,
                "qty": quantity!,
                "quote_id": "\(self.key!)"
            ]
        ]
        print(parameters)
        request.addValue("application/json", forHTTPHeaderField: "Content-Type")
        let session = URLSession(configuration:URLSessionConfiguration.default, delegate: nil, delegateQueue: nil)
        let dataTask = session.dataTask(with: request) { (data, response, error) -> Void in

            if error != nil {

                //handle error
            }
            else {

                let jsonStr = NSString(data: data!, encoding: String.Encoding.utf8.rawValue)
                print("Parsed JSON: '\(jsonStr)'")
            }
        }
        dataTask.resume()
    }

Answer 1

试着加上这个。

let data = try! JSONSerialization.data(withJSONObject: parameters, options: JSONSerialization.WritingOptions.prettyPrinted)
request.httpBody = data