这是什么意思呢？ class不是密钥QS1的密钥值编码兼容。 [英] what is the meaning of this this" class is not key value coding-compliant for the key QS1."

问题描述

下面是我的代码

 NSString * questionString = [[NSString alloc] initWithFormat： @ ％lu，[问题数]]; 
  int  questions = [questionString intValue]; 
 NSString * answerString = [[NSString alloc] initWithFormat： @ ％lu，[答案数]]; 
  int  answers = [answerString intValue] / 3; 
 NSString * correctAnswersString = [[NSString alloc] initWithFormat： @ ％lu，[ correctAnswers count]]; 
  int  correctAnswers = [correctAnswersString intValue]; 
  if （（questions = answers）&&（questions == correctAnswers））{
 NSLog（ @ 问题，答案和正确答案）; 
} 
  else  
 {
 NSLog（ @  \ n警告APP将崩溃\ nSOLUTION：\ n如果您有相同数量的问题和正确答案，请检查，如果您为每个问题提供3个答案！）; 
 NSLog（ @  \ nNESESTIONS =％d \ nANSWERS =％d（3连多） \\ n \\ nCORRECTANSWERS =％d，questions，[answerString intValue]，correctAnswers）; 
} 
 
 
 
} 

解决方案

你错过了一个 =在这一行中

 if（（questions == answers）&&（questions == correctAnswers））

错误说你在KVO中QS1，但我没有看到任何。这是你没有展示的方法或类名吗？

我的提示是，你使用了KVO语法，但没有实现它。



您应该阅读 Apple的文档以了解复杂的KVO。

below is my code

NSString *questionString = [[ NSString alloc] initWithFormat:@"%lu",[questions count]];
    int questions = [questionString intValue];
    NSString *answerString = [[NSString alloc] initWithFormat:@"%lu" , [answers count]];
    int answers = [answerString intValue]/3;
    NSString *correctAnswersString = [[NSString alloc] initWithFormat:@"%lu" , [correctAnswers count]];
    int correctAnswers = [correctAnswersString intValue];
    if ((questions = answers) && (questions == correctAnswers)) {
        NSLog(@"Questions, answers and correct answers written");
    }
    else
    {
        NSLog(@"\nWARNING APP WILL CRASH \nSOLUTION: \nCheck if you have the same amount of questions and CORRECT answers, AND if you jave 3 answers for each question!");
        NSLog(@"\nQUESTIONS = %d \nANSWERS = %d (3 tiems more) \nCORRECTANSWERS = %d ", questions , [answerString intValue] , correctAnswers);
    }



}

解决方案

you missed a "=" in this line

if ((questions == answers) && (questions == correctAnswers))

The error says that you QS1 in KVO but I dont see any. It is a method or class name which you didnt show?
My tip is that, you used KVO-syntax but dont implement it.

You should read the Documenation from Apple to understand the complex KVO.

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