您需要将content-type标头值设置为使用JSON。
request.addValue('application/json', forHTTPHeaderField: 'Content-Type')
将代码更新为Swift 3，并删除了与请求无关的所有内容：
let myUrl = URL(string: 'http://foodhelper.club/registerUser.PHP');var request = URLRequest(url:myUrl!);request.httpMethod = 'POST';request.addValue('application/json', forHTTPHeaderField: 'Content-Type')let postString = 'userEmail=email&userFirstName=firstname&userLastName=lastname&userPassword=password';request.httpBody = postString.data(using: String.Encoding.utf8);URLSession.shared.dataTask(with: request, completionHandler: { (data:Data?, response:URLResponse?, error:Error?) -> Void inif error != nil { print('fail') return}do { let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as? NSDictionary print ('1') if let parseJSON = json {let userId = parseJSON['userId'] as? Stringprint ('2')if( userId != nil) {} else { let errorMessage = parseJSON['message'] as? String print ('3')} }} catch{ print(error)}}).resume()解决方法
当我运行代码时，出现此错误，我不知道为什么。
错误域= NSCocoaErrorDomain代码= 3840“无值。” UserInfo = {NSDebugDescription =无值。}
我在互联网上寻找它，但没有找到任何东西。
这是我的代码：
let myUrl = NSURL(string: 'http://foodhelper.club/registerUser.php'); let request = NSMutableURLRequest(URL:myUrl!); request.HTTPMethod = 'POST'; let postString = 'userEmail=(userEmail!)&userFirstName=(userFirstName!)&userLastName=(userLastName!)&userPassword=(userPassword!)'; request.HTTPBody = postString.dataUsingEncoding(NSUTF8StringEncoding); NSURLSession.sharedSession().dataTaskWithRequest(request,completionHandler: { (data:NSData?,response:NSURLResponse?,error:NSError?) -> Void indispatch_async(dispatch_get_main_queue()){ if error != nil {self.alertMessage(error!.localizedDescription)print('fail')return } do { let json = try NSJSONSerialization.JSONObjectWithData(data!,options: .MutableContainers) as? NSDictionaryprint ('1') if let parseJSON = json { let userId = parseJSON['userId'] as? String print ('2') if( userId != nil) {let myAlert = UIAlertController(title: 'Alert',message: 'Registration successful',preferredStyle: UIAlertControllerStyle.Alert);let okAction = UIAlertAction(title: 'OK',style: UIAlertActionStyle.Default){(action) in self.navigationController?.popViewControllerAnimated(true) }myAlert.addAction(okAction);self.presentViewController(myAlert,animated: true,completion: nil) } else {let errorMessage = parseJSON['message'] as? Stringprint ('3')if(errorMessage != nil){ self.alertMessage(errorMessage!)} }} } catch{//email vergleich fehlt,egal obprint(error)print('catched error')let myAlert = UIAlertController(title: 'Alert',preferredStyle: UIAlertControllerStyle.Alert);let okAction = UIAlertAction(title: 'OK',style: UIAlertActionStyle.Default){(action) in self.navigationController?.popViewControllerAnimated(true)}myAlert.addAction(okAction);self.presentViewController(myAlert,completion: nil) }} }).resume()}
谢谢您的帮助
