CloudKit，我的身份驗證不工作

我做了一個使用CloudKit中的記錄的身份驗證，因此我創建了一個帳戶，然後進入我的登錄頁面並嘗試登錄，第一次按登錄時，它顯示我的錯誤消息「用戶名或密碼不正確「，但是第二次按下登錄按鈕時，它就起作用了。我真的不知道這是什麼原因造成的。CloudKit，我的身份驗證不工作

以下是我認爲是相關代碼：

func loginPressed() { 

    validLogin() 

    if usernameExists == true && passwordIsValid == true { 
     performSegue(withIdentifier: "loginToGames", sender: self) 
    } else { 

     self.incorrectLabel.isHidden = false 
    } 
} 



func validLogin() { 

    let container = CKContainer.default() 
    let pubDB = container.publicCloudDatabase 

    //query users to find current user 
    let query = CKQuery(recordType: "MyUsers", predicate: Predicate(format: "TRUEPREDICATE", argumentArray: nil)) 
    pubDB.perform(query, inZoneWith: nil, completionHandler: { (records, error) in 

     if error == nil { 

      for record in records! { 

       if record.object(forKey: "Username") as? String == self.usernameField.text { 

        self.incorrectLabel.isHidden = true 
        self.usernameExists = true 
        print("searchUsername \(record.object(forKey: "Username") as? String)") 
       } else { 

        self.incorrectLabel.isHidden = false 
        self.usernameExists = false 
        print("searchUsername error") 
       } 

      } 

     } else { 
      print("searchLoginError\(error)") 
     } 
    }) 

    let queryPassword = CKQuery(recordType: "MyUsers", predicate: Predicate(format: "TRUEPREDICATE", argumentArray: nil)) 
    pubDB.perform(queryPassword, inZoneWith: nil, completionHandler: { (records, error) in 

     if error == nil { 

      for record in records! { 

       if record.object(forKey: "Password") as? String == self.passwordField.text { 

        self.incorrectLabel.isHidden = true 
        self.passwordIsValid = true 
        print("searchPassword \(record.object(forKey: "Password") as? String)") 
       } else { 

        self.incorrectLabel.isHidden = false 
        self.passwordIsValid = false 
        print("searchPassword error") 
       } 

      } 

     } else { 
      print("searcherror\(error)") 
     } 
    }) 

} 

func checkValidLogin() { 

    let container = CKContainer.default() 
    let pubDB = container.publicCloudDatabase 

    //query users to find current user 
    let query = CKQuery(recordType: "MyUsers", predicate: Predicate(format: "TRUEPREDICATE", argumentArray: nil)) 
    pubDB.perform(query, inZoneWith: nil, completionHandler: { (records, error) in 

     //we do not need to check for error code 11 because a user should exist 
     if error == nil { 

      var userExists = false 

      for record in records! { 

       if record.object(forKey: "Username") as? String == self.usernameField.text { 

        if record.object(forKey: "Password") as? String == self.passwordField.text { 

         OperationQueue.main.addOperation { 

          userExists = true 
          UserDefaults.standard.set(self.usernameField.text!, forKey: "Username") 
          username = self.usernameField.text! 


         } 

        } else { 

         //user with the username exists, but the password does not match 
         self.incorrectLabel.isHidden = false 

        } 

       } 

      } 

      if userExists == false { 

       //user with that username does not exist 
       self.incorrectLabel.isHidden = false 

      } 


     } else { 

      print("searcherror \(error)") 

     } 

    }) 

}

來源

2016-09-13 RufusV

這是相當簡單的。

您正在執行異步調用以檢查userExists和passwordIsValid，但在執行if測試之前，您並不想要回答。

所以第一次，completionHandler沒有完成，所以userExists和passwordIsValid設置爲false。在第二次執行時，處理程序確實將值設置爲true。

你應該通過你的if測試作爲completionHandler爲validLogin功能

樣品：

func loginPressed() { 

    validLogin() { (usernameExists, passwordIsValid) in 

     if usernameExists == true && passwordIsValid == true { 
      performSegue(withIdentifier: "loginToGames", sender: self) 
     } else { 
      self.incorrectLabel.isHidden = false 
     } 
    } 
} 

func validLogin(completion : ((usernameExists : Bool, passwordIsValid : Bool) -> Void)) { 

    let container = CKContainer.default() 
    let pubDB = container.publicCloudDatabase 
    let group = dispatch_group_create() //make sur both handler are triggered 
    //query users to find current user 

    dispatch_group_enter(group) 
    let query = CKQuery(recordType: "MyUsers", predicate: Predicate(format: "TRUEPREDICATE", argumentArray: nil)) 
    pubDB.perform(query, inZoneWith: nil, completionHandler: { (records, error) in 

     if error == nil { 

      for record in records! { 

       if record.object(forKey: "Username") as? String == self.usernameField.text { 

        self.incorrectLabel.isHidden = true 
        self.usernameExists = true 
        break 
       } else { 
        self.incorrectLabel.isHidden = false 
        self.usernameExists = false 
       } 
      } 

     } else { 
      print("searchLoginError\(error)") 
     } 

     dispatch_group_leave(group) 

    }) 

    dispatch_group_enter(group) 
    let queryPassword = CKQuery(recordType: "MyUsers", predicate: Predicate(format: "TRUEPREDICATE", argumentArray: nil)) 
    pubDB.perform(queryPassword, inZoneWith: nil, completionHandler: { (records, error) in 


     if error == nil { 
      for record in records! { 
       if record.object(forKey: "Password") as? String == self.passwordField.text { 

        self.incorrectLabel.isHidden = true 
        self.passwordIsValid = true 
        break 
       } else {  
        self.incorrectLabel.isHidden = false 
        self.passwordIsValid = false 
        print("searchPassword error") 
       } 

      } 
     } else { 
     print("searcherror\(error)") 
     } 
     dispatch_group_leave(group) 

    }) 

    dispatch_group_notify(group, dispatch_get_main_queue()) { 
    //You have both answers 
     completion(self.usernameExists, passwordIsValid : self.passwordIsValid) 

    }) 
}

來源

2016-09-13 13:09:06 CZ54

對不起，該在哪裏添加？我是編碼新手。 – RufusV

下面寫在你完成處理程序的一部分，

if usernameExists == true && passwordIsValid == true { 
    performSegue(withIdentifier: "loginToGames", sender: self) 
} else { 

    self.incorrectLabel.isHidden = false 
}

你上面的代碼也越來越在usernameExists和passwordIsValid第一次獲得任何值之前執行。所以把這段代碼片段放在最終的完成處理程序中，你的問題就解決了！！

來源

2016-09-13 13:20:27 Lion

對不起，應該在哪裏添加？我是編碼新手。 – RufusV

CloudKit，我的身份驗證不工作

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