快速发布请求编码加号变成空格

最近我发现当我发送包含“+”号的帖子数据时，“+”会变成空格。例如{菜肴名称：鱼+薯条}。这会导致服务器端无法读取数据。所以我尝试以下，我使用：

request.setValue("application/json; charset=utf-8", forHTTPHeaderField: "Content-Type")

将我的请求编码为 UTF-8。但是，这一行导致我的发布数据变空。我不知道为什么会发生这种情况。或者是否有更好的解决方案在 post 方法期间保持“+”号本身？

func PostMethod(url:NSURL,Data:String) {

   let request = NSMutableURLRequest(URL: url)
   let session = NSURLSession.sharedSession()
   let submitContent = Data
   request.setValue("application/json; charset=utf-8", forHTTPHeaderField: "Content-Type")
   request.HTTPMethod = "POST"
   request.HTTPBody = submitContent.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: true)


   //print("——request——")
   //print(request)

   let task = session.dataTaskWithRequest(request){
       data, response, error in


       if data != nil{

           let responseString = NSString(data: data!, encoding: NSUTF8StringEncoding) as! String
           print(responseString)

           let jsonall = self.commonControl.StringToJson(responseString)
           if let dataFromString = jsonall["body"].stringValue.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false) {
               let json = JSON(data: dataFromString)
}}}}

您可以尝试转换您的+转换成它的 ASCII 码。例如：

let content = exampleString.stringByReplacingOccurrencesOfString("+", withString: "%2B", options: [], range: nil)

Swift 3+

let content = exampleString.replacingOccurrences(of: "+", with: "%2B")