Question

我正在查看Parse文档，如果提供的用户名和电子邮件是否已注册（使用），我希望使用这个有趣的函数来验证注册用户。该文档提供了以下示例：

var lotsOfWins = PFQuery(className:"Player")
lotsOfWins.whereKey("wins", greaterThan:150)

var fewWins = PFQuery(className:"Player")
fewWins.whereKey("wins", lessThan:5)

var query = PFQuery.orQueryWithSubqueries([lotsOfWins, fewWins])
query.findObjectsInBackgroundWithBlock {
  (results: [PFObject]?, error: NSError?) -> Void in
  if error == nil {
    // results contains players with lots of wins or only a few wins.
  }
}

我的版本是：

/*Check username and email not taken*/
        let usernameInputCheck = PFQuery(className:"_User")
        usernameInputCheck.whereKey("appUsername", equalTo: self.usernameTxtField.text!)

        let emailInputCheck = PFQuery(className:"_User")
        emailInputCheck.whereKey("email", equalTo:self.emailTxtField.text!)

        let query = PFQuery.orQueryWithSubqueries([usernameInputCheck, emailInputCheck])
        query.findObjectsInBackgroundWithBlock {
            (results: [PFObject]?, error: NSError?) -> Void in
            if error == nil {
                // results contains players with lots of wins or only a few wins.
            }
        }

我希望能够检查是否采用了电子邮件或用户名，如果是，则设置一个标志，以便我可以向用户设置消息，例如：“提供的电子邮件已经注册”或“用户名不可用，请尝试另一个“。

提前感谢您的帮助。

更新：以下是解析文档的链接：https://parse.com/docs/ios/guide#queries-compound-queries

Answer 1

这里有一些Objective-c可以轻松适应Swift。

PFQuery * nameQuery = [PFQuery queryWithClassName:@"user"]
[nameQuery whereKey:"username" equalTo:username];
PFQuery * emailQuery = [PFQuery queryWithClassName:@"user"];
[emailQuery whereKey:"email" equalTo:email];


PFQuery * query = [PFQuery orQueryWithSubqueries:@[nameQuery, emailQuery]

        [query countObjectsInBackgroundWithBlock:^(int number, NSError *error) {
          if(number > 0) {
            //Email address OR username is already in use. 
         }
        }];

Answer 2

解决问题：

让usernameInputCheck = PFQuery（className：＆＃34; _User＆＃34;） usernameInputCheck.whereKey（＆＃34; appUsername＆＃34;，equalTo：self.usernameTxtField.text！）

    let emailInputCheck = PFQuery(className:"_User")
    emailInputCheck.whereKey("email", equalTo:self.emailTxtField.text!)

    let query = PFQuery.orQueryWithSubqueries([usernameInputCheck, emailInputCheck])
    query.findObjectsInBackgroundWithBlock {
        (results: [PFObject]?, error: NSError?) -> Void in
        if error == nil {
            let checkResult = self.emailOrUsernameIsTaken(results!)
            if(checkResult != 0 && checkResult == 1)
            {
               //username taken
            }else if (checkResult != 0 && checkResult == 2){
               //email taken
            }
        }
    }

这是函数：

func emailOrUsernameIsTaken(results: [PFObject])->Int
    {
        /*Check if username is taken or if email is taken*/

        var preferenceTaken: Int = 0

        if(results[0]["email"] as! String != "" && results[0]["email"] as! String == self.userObject.email!)
        {
            preferenceTaken = 1
        }else if(results[0]["appUsername"] as! String != "" && results[0]["appUsername"] as! String == self.userObject.username!){
            preferenceTaken = 2
        }

        return preferenceTaken
    }

Swift Parse - 使用PFQuery或QueryWithSubqueries函数

2 个答案: