iOS错误，我可以'；t复制

我在应用商店里有一个复习测验应用，在过去的3个月里每天下载10次。它被很好地使用，并且大部分都有很好的评价。然而，最近我得到了两个1星级的评价，因为人们抱怨在测验结束后“评价”屏幕是空白的

我在iphone5/5c/5s上试用过，效果非常好。这些是我能接触到的唯一设备，但我也为iPad和两个iPhone 6版本运行了模拟器，我无法复制这个问题

流程是RootController->QuizController->ResultsController->ReviewController。测验控制器有一个名为GameManager的对象作为实例变量。这会随着测验的进行跟踪用户的答案和问题，并在分段过程中从测验传递到结果，然后再传递到复习部分

传递对象的函数有：

//From Quiz to Results 
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
// Make sure your segue name in storyboard is the same as this line
if ([[segue identifier] isEqualToString:@"quiz2results"])
{
    // Get reference to the destination view controller
    ResultsController *vc = [segue destinationViewController];

    // Pass any objects to the view controller here, like...
    [vc setManager:_manager];
}
}

//From Results to Review
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
// Make sure your segue name in storyboard is the same as this line
if ([[segue identifier] isEqualToString:@"results2review"])
{
    // Get reference to the destination view controller
    ReviewController *vc = [segue destinationViewController];

    // Pass any objects to the view controller here, like...
    [vc setManager:_manager];
}
}

然后在审查控制器中执行以下代码：

-(void)setReviewText{

NSArray* questions = [[NSArray alloc] init];
questions = [_manager getAllQuestions];
NSMutableArray* userAnswer = [[NSMutableArray alloc] init];
userAnswer = [self answersAttributed];

if (userAnswer == nil)
{
    _output.text = @"Error";
}

NSMutableAttributedString *mutableAttString = [[NSMutableAttributedString alloc] init];

int i = 0;
NSAttributedString *linebreak =[[NSAttributedString alloc] initWithString:@"\n"];
for (Question* q in questions)
{
    if (i == [userAnswer count])
        break;

    NSAttributedString *qtext =[[NSAttributedString alloc] initWithString:q.questionText];
    NSAttributedString *ctext =[[NSAttributedString alloc] initWithString:@"Correct Answer:\n"];

    NSAttributedString *atext =[[NSAttributedString alloc] initWithString:q.answerText];
    NSAttributedString *ytext =[[NSAttributedString alloc] initWithString:@"Your Answer:\n"];
    NSAttributedString *utext =[[NSAttributedString alloc] initWithAttributedString:userAnswer[i]];
    [mutableAttString appendAttributedString:qtext];
    [mutableAttString appendAttributedString:linebreak];
    [mutableAttString appendAttributedString:ctext];
    [mutableAttString appendAttributedString:atext];
    [mutableAttString appendAttributedString:linebreak];
    [mutableAttString appendAttributedString:ytext];
    [mutableAttString appendAttributedString:utext];
    [mutableAttString appendAttributedString:linebreak];
    [mutableAttString appendAttributedString:linebreak];
    i++;
}
NSAttributedString* outText = [[NSAttributedString alloc] init];
outText = [mutableAttString mutableCopy];
_output.attributedText = outText;
[_output setFont:[UIFont preferredFontForTextStyle:UIFontTextStyleBody]];
}

-(NSMutableArray*)answersAttributed
{
NSMutableArray* ansAtt = [[NSMutableArray alloc] init];
NSArray* questions = [[NSArray alloc] init];
questions = [_manager getAllQuestions];

NSArray* userAnswers = [[NSArray alloc] init];
userAnswers = [_manager getAllUserAnswers];


if ([questions count] != [userAnswers count])
{
    return ansAtt;
}


int i = 0;
for (NSString* userAnswer in userAnswers )
{
    if([[questions[i] answerText] isEqualToString:userAnswer] )
    {
        NSDictionary *attributes = @{NSBackgroundColorAttributeName:[UIColor greenColor]};
        NSAttributedString *attrString = [[NSAttributedString alloc] initWithString:userAnswer attributes:attributes];
        [ansAtt addObject:attrString];
    }
    else
    {
        NSDictionary *attributes = @{NSBackgroundColorAttributeName:[UIColor redColor]};
        NSAttributedString *attrString = [[NSAttributedString alloc] initWithString:userAnswer attributes:attributes];
        [ansAtt addObject:attrString];

    }
    i++;
}

return ansAtt;
}

---

如果有人能解释一下，我会很高兴的。到目前为止，这个问题的原因一直在暗指我。

blank表示某个内容为零，或者情节提要不好（我指的是约束混乱或类似内容）。我知道我帮不了什么忙，但你有没有那样看？如果用户试图点击“下一步”而不回答所有问题/根本不回答。有些数据无法传递，因此您的审阅页面将是无数据的。请查看您退出处理的错误情况，是什么原因导致这些错误？不太可能有人能提供最新信息。