从plist读字典和儿童字典

Question

我创建了一个如下所示的plist文件：

从这里可以将所有plist信息提取到NSArray中：

-(NSArray *)Topics
{
    if(!_Topics)
    {
        _Topics = [[NSArray alloc] initWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"TopicData" ofType:@"plist"]];
    }
    return _Topics;
}

并使用此数组加载TopicTitle的表视图：

cell.textLabel.text = [[self.Topics objectAtIndex:indexPath.row] valueForKey:@"TopicTitle"];

当选择表中的一行时，我将名为“Questions”的字典传递给下一个ViewController，如下所示：

NSDictionary *questions = [[self.Topics objectAtIndex:indexPath.row] valueForKey:@"Questions"];
[self.detailViewController setQuestions:(questions)];

从这里开始，我想遍历每个'Question'字典并通过这样的方式将'QuestionText'和'AnswerOne / Two ......'字符串加载到一个对象数组中：

TopicQuestions = [NSMutableArray array];
for(NSDictionary *ques in self.Questions)
{
    Question* q = [[Question alloc] init];
    q.Question = (NSString*)[ques objectForKey:@"QuestionText"];
    q.AnswerOne = (NSString*)[ques objectForKey:@"QuestionText"];
    q.AnswerTwo = (NSString*)[ques objectForKey:@"QuestionText"];
    q.AnswerThree = (NSString*)[ques objectForKey:@"QuestionText"];
    q.AnswerFour = (NSString*)[ques objectForKey:@"QuestionText"];
    [TopicQuestions addObject:q];
}

但是'问题'字典似乎没有这个数据可用，它知道有4个子对象，但没有这些对象的所有键对值：

所以我的问题是如何将'Questions'字典传递给下一个ViewController，这样我仍然可以访问'QuestionText'和'AnswerOne / Two ......'节点？

或者有没有更好的方法来阅读字符串而不循环遍历每个'问题'字典？

Answer 1

我认为你没有正确地获得问题词典。在屏幕截图中，ques对象是NSString对象，而不是NSDictionary。因此，objectForKey对象NSString上的ques无法正常运行（并且确实会导致您的应用崩溃）。

试试这个循环：

for(NSString *ques in self.Questions)
{
    NSDictionary *dict = [self.questions objectForKey:ques];
    Question* q = [[Question alloc] init];
    q.Question = (NSString*)[dict objectForKey:@"QuestionText"];
    q.AnswerOne = (NSString*)[dict objectForKey:@"QuestionText"];
    q.AnswerTwo = (NSString*)[dict objectForKey:@"QuestionText"];
    q.AnswerThree = (NSString*)[dict objectForKey:@"QuestionText"];
    q.AnswerFour = (NSString*)[dict objectForKey:@"QuestionText"];
    [TopicQuestions addObject:q];
}