Question

任何知道从数据库检索数据并使用它来检查用户是否退出（登录）的人都可以提供帮助。我的头被破坏了，不幸的是我的编码不足以解决问题！

 do {


                if let json = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as? NSDictionary
                {


                    let parseJSON = json

                    let userID = parseJSON["userId"] as? String //dictionary object that uses a key

                    if(userID != nil)
                    {
                        //everything is fine and take user to main page 
                        //instantiate the view controller
                        let profilePage = self.storyboard?.instantiateViewControllerWithIdentifier("ProfilePageViewController") as! ProfilePageViewController

                        //wrap it in nav controller

                        let profilePageNav = UINavigationController(rootViewController: profilePage)

                        //take user to this page
                        //window root view controller- existing is replaced and no back button

                        let appDelegate = UIApplication.sharedApplication().delegate
                        appDelegate?.window??.rootViewController = profilePageNav




                    }else{
                        //display the alert message from the php file
                        let errorMessage = parseJSON["message"] as? String


                        let myAlert = UIAlertController(
                            title: "Alert!",
                            message: errorMessage,
                            preferredStyle: UIAlertControllerStyle.Alert)

                        //create a button action -
                        let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil)

                        //adding ok button and presenting to a user and once ok button is pressed- dismiss the view
                        myAlert.addAction(okAction)
                        self.presentViewController(myAlert, animated: true, completion:nil)





                    }


                }//end of if let json
            }//end of do
            catch let error as NSError {
                print(error.localizedDescription)
            }



            print("success")

        }//end of dispatch_async
    }).resume()//end of request




}//end of action sign in

我认为问题在于if let json = try行，数据格式不正确。我的PHP脚本运行良好，我可以在浏览器中传递参数，一切似乎都可以。密钥是正确的（userId）。我认为另一个问题是让userID = parseJSON [＆＃34; userId＆＃34;]为？串

如果我作为NSDictionary请求数据 - 如何将此信息转换为String类型（我确定你无论如何都可以）抱歉 - 很多问题。我需要在另一个视图控制器中使用String表示。我已经尝试了很多年，我无法让它工作，所以我真的很感激一些帮助 - 当我运行代码时 - 它会绕过＆＃34; do＆＃34;阻止并直接进入.localizedDescription

感谢您抽出时间阅读我的v问题！

Answer 1

问题肯定出在NSJSONSerialization.JSONObjectWithData中，由于某种原因，它并不像你的JSON。

尝试清理JSON，然后再将其提供给NSJSONSerialization：

var dataString = String(data: data, encoding: NSUTF8StringEncoding)!
dataString = dataString.stringByReplacingOccurrencesOfString("\\'", withString: "'")
let cleanData: NSData = dataString.dataUsingEncoding(NSUTF8StringEncoding)!

Answer 2

while sending a request "request.setValue("application/json", forHTTPHeaderField: "Accept")" resolved my error.

使用swift解析json数据时出错＃34;数据无法读取，因为格式不正确。＆＃34;

2 个答案: