使用Swift从Parse中检索对象1.2

  • Z时代
  • 2024-01-10
  • 分类：问答

我刚接触网络，Xcode和Parse，并且我只是遵循YouTube教程，但由于某些原因代码无法运行。这里是。使用Swift从Parse中检索对象1.2

func CallData(){ 
    var query : PFQuery = PFQuery(className: "QuestionsAndAnswers") 
    query.getObjectInBackgroundWithId("DZfARcuav8"){ 
     (ObjectHolder : PFObject!, error : NSError!) -> Void in 
     if (error == nil){ 
      self.Question = ObjectHolder["Question"] as! String 
      self.Answers = ObjectHolder["Answers"] as! Array 
      self.Answer = ObjectHoler["Answer"] as! String 
      if (self.Answers.count > 0){ 
       self.QuestionLabel.text = self.Question 
       self.Button1.setTitle(self.Answers[0], forState: UIControlState.Normal) 
       self.Button1.setTitle(self.Answers[1], forState: UIControlState.Normal) 
       self.Button1.setTitle(self.Answers[2], forState: UIControlState.Normal) 
       self.Button1.setTitle(self.Answers[3], forState: UIControlState.Normal) 
      } 
     } 
     else{ 
      NSlog("There is something wrong") 
     } 
    } 
}

错误消息说

不能援引 'getObjectInBackgroundWithId' 类型的参数“（字符串，（PFObject，NSError）！ - >无效）

回答：

你必须删除PFObject！和NSError！ ！标记闭包没有返回一个可选类型。尝试follwing代码

func CallData(){ 
    var query : PFQuery = PFQuery(className: "QuestionsAndAnswers") 
    query.getObjectInBackgroundWithId("DZfARcuav8"){ 
     (ObjectHolder, error) -> Void in 
     if (error == nil){ 
let object = ObjectHolder as [NSObject: AnyObject] 
      self.Question = object["Question"] as String 
      self.Answers = object["Answers"] as Array 
      self.Answer = object["Answer"] as String 
      if (self.Answers.count > 0){ 
       self.QuestionLabel.text = self.Question 
       self.Button1.setTitle(self.Answers[0], forState: UIControlState.Normal) 
       self.Button1.setTitle(self.Answers[1], forState: UIControlState.Normal) 
       self.Button1.setTitle(self.Answers[2], forState: UIControlState.Normal) 
       self.Button1.setTitle(self.Answers[3], forState: UIControlState.Normal) 
      } 
     } 
     else{ 
      NSlog("There is something wrong") 
     } 
    } 
}

回答：

不太清楚，如果这能帮助你..它没有在我的编码虽然帮我..

func CallData(){ 
var query : PFQuery = PFQuery(className: "QuestionsAndAnswers") 
query.getObjectInBackgroundWithId("DZfARcuav8"){ 
    (ObjectHolder, error) -> Void in 
    if (error == nil){ 
     ObjectHolder!.setValue(self.Question, forKey: "Question") 
     ObjectHolder!.setValue(self.Answers, forKey: "Answers") 
     ObjectHolder!.setValue(self.Answer, forKey: "Answer")

....

回答：

这是什么工作对我来说：

var query = PFQuery(className: "score") 
query.getObjectInBackgroundWithId("j5xBfJ9YXu", block: { 
    (obj, error)in 
    if let score = obj! as? PFObject { 
     println(score.objectForKey("name")) 
    } else { 
     println(error) 
    } 
})

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