在调用中出现额外的参数错误

Question

我一直在尝试使用php登录一段时间，但我有一个最终的错误，阻止我完成。原来在NSJSONSerialization中给出了一个错误，其中错误告诉我：错误在调用中的额外参数。然后，我会提供一个截图，以便错误更加清晰，并且代码可以帮助我，因为我处于阻塞时刻，我不知道如何解决它。在此先感谢

照片错误：[ 代码：

@IBAction func loginButtonTapped(sender: AnyObject) { 

    let userEmail = userEmailTextField.text; 
    let userPassword = userPasswordTextField.text; 



    if(userEmail!.isEmpty || userPassword!.isEmpty) { return; } 

    let myUrl = NSURL(string: "http://localhost/billapp/userSignIn.php"); 
    let request = NSMutableURLRequest(URL:myUrl!); 
    request.HTTPMethod = "POST"; 

    let postString = "userEmail=\(userEmail)&userPassword=\(userPassword)"; 

    request.HTTPBody = postString.dataUsingEncoding(NSUTF8StringEncoding); 

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

     if error != nil{ 
      print("error=\(error)") 
      return 
     } 

     var err: NSError? 

     var json = NSJSONSerialization.JSONObjectWithData(data, options: .MutableContainers, error:NSError) as? NSDictionary 

     if let parseJSON = json { 
      var resultValue:String = parseJSON["status"] as String!; 
      print("result: \(resultValue)") 

      if(resultValue=="Success") 
      { 
       NSUserDefaults.standardUserDefaults().setBool(true, forKey: "isUserLoggedIn"); 
       NSUserDefaults.standardUserDefaults().synchronize(); 

       self.dismissViewControllerAnimated(true, completion: nil); 
      } 
     } 
    } 
    task.resume() 
} 

last error

Answer 1

您可以按照快速修复sugestions。这样做会让你最终是这样的：

do { 
    var json = try JSONSerialization.jsonObject(with: Data(), options: .mutableContainers) 
    if let parseJSON = json { 
      //your code 
    } 
} catch { 
    //handle error 
} 

Answer 2

与Objective C中，按照在斯威夫特新methodolgy，错误使用的try/catch块管理，而不是传递错误对象的方法。

使用斯威夫特3.

do { 
     var json = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) 
     if let parseJSON = json { 
     var resultValue:String = parseJSON["status"] as String!; 
     print("result: \(resultValue)") 

     if(resultValue=="Success") 
     { 
      NSUserDefaults.standardUserDefaults().setBool(true, forKey: "isUserLoggedIn"); 
      NSUserDefaults.standardUserDefaults().synchronize(); 

      self.dismissViewControllerAnimated(true, completion: nil); 
     } 
    } 
} catch let error { 
     //Perform the error handling here 
} 

下面的代码斯威夫特2

do { 
     var json = try NSJSONSerialization.JSONObjectWithData(data, options: .MutableContainers) 
     if let parseJSON = json { 
     var resultValue:String = parseJSON["status"] as String!; 
     print("result: \(resultValue)") 

     if(resultValue=="Success") 
     { 
      NSUserDefaults.standardUserDefaults().setBool(true, forKey: "isUserLoggedIn"); 
      NSUserDefaults.standardUserDefaults().synchronize(); 

      self.dismissViewControllerAnimated(true, completion: nil); 
     } 
    } 
} catch let error { 
     //Perform the error handling here 
}