在 IBAction 中为测验显示不同颜色的 UIButtons

Question

我有四个 UIButtons 代表 4 个答案。我设法把所有东西都连接起来，用绿色显示正确答案，用红色显示错误答案。

我唯一的问题是当用户选择了错误的答案时，我会将所有答案都显示为灰色。我也想向用户展示正确的答案。我尝试过 else if 语句，但遗漏了一些东西，有什么建议吗？

-(IBAction)Answer1:(id)sender{

    if (Answer1Correct == YES) {
        [Answer1 setTitle:@"Correct" forState:UIControlStateNormal];
        [Answer1 setBackgroundColor:[UIColor greenColor]];
        [self RightAnswer];
    }
    else{

        [Answer1 setBackgroundColor:[UIColor redColor]];
        [Answer1 setTitle:@"Incorrect" forState:UIControlStateNormal];
        [Answer2 setBackgroundColor:[UIColor colorWithRed:102.0/255.0 green:102.0/255.0 blue:102.0/255.0 alpha:1.0f]];
        [Answer3 setBackgroundColor:[UIColor colorWithRed:102.0/255.0 green:102.0/255.0 blue:102.0/255.0 alpha:1.0f]];
        [Answer4 setBackgroundColor:[UIColor colorWithRed:102.0/255.0 green:102.0/255.0 blue:102.0/255.0 alpha:1.0f]];
        [self WrongAnswer];
    }
}

Answer 1

最好的方法是从UIButton继承。创建类QuizQuestionButton 这个类将有方法 -setCorrectAnswer:(NSString *)correctAnswer 和 -setRealAnswer:(NSString *)realAnswer

如果两者相同 - 将背景颜色设置为绿色，否则设置为红色。

-(void)setCorrectAnswer:(NSString *)correctAnswer {
     _correctAnswer = correctAnswer;
}

-(void)setRealAnswer:(NSString *)realAnswer {
    if (realAnswer == _correctAnswer) {
        self.backgroundColor = [UIColor greenColor];
    } else {
        self.backgroundColor = [UIColor redColor];
    }
}

还阅读了设计模式 - 策略。这种模式可以帮助您避免 if-else 语句。

Answer 2

试试这个：

 if (Answer1Correct == YES) {
    [Answer1 setTitle:@"Correct" forState:UIControlStateNormal];
    [Answer1 setBackgroundColor:[UIColor greenColor]];
    [self RightAnswer];
}
else{

    [Answer1 setBackgroundColor:[UIColor redColor]];

    [Answer2 setBackgroundColor:[UIColor greyColor]];
    [Answer3 setBackgroundColor:[UIColor greyColor]];
    [Answer4 setBackgroundColor:[UIColor greyColor]];

    if(Answer2isCorrect)
      { [Answer2 setBackgroundColor:[UIColor greenColor]]; }
    else if(Answer3isCorrect)
      { [Answer3 setBackgroundColor:[UIColor greenColor]]; }
    else if(Answer4isCorrect)
      { [Answer4 setBackgroundColor:[UIColor greenColor]]; }
}

如果选择的答案是错误的，首先将所有其他按钮设置为灰色，然后找到正确的答案并将其更改为绿色。

您可能还希望在单击答案后禁用所有按钮以防止再次单击。