Question

我正在解析xml文件并在字典中获取值，我试图通过它们的名称提取值，但其中一些我得到和剩下的是null。这是我的字典，

dictionary: {
"__name" = QF;
"_category" = "C&M";
"_id" = AB2001;
"_ni_exempt" = no;
"_topic" = Alertness;
answers =     {
    answer =         (
                    {
            "_correct" = no;
            text = "give an arm signal as well as using your indicators";
        },
                    {
            "_correct" = no;
            text = "signal so that other drivers can slow down for you";
        },
                    {
            "_correct" = yes;
            text = "look over your shoulder for a final check";
        },
                    {
            "_correct" = no;
            text = "select a higher gear than normal";
        }
    );
};
question =     {
    explanation =         {
        text = "If you want to make a U-turn, slow down and ensure that the road is clear in both directions. Make sure that the road is wide enough to carry out the manoeuvre safely.";
        voice =             {
            "_id" = "AB2001-2";
        };
    };
    prompt = "Mark one answer";
    text = "Before you make a U-turn in the road, you should";
    voice =         {
        "_id" = "AB2001-1";
    };
    xref = "DES s4, DES s9, HC r159-161";
};
}

这是我试图提取值的代码，

-(void)fetchValuesFromDictioanry:(NSDictionary*)xmlDict
{

for (NSString *string in [xmlDict allKeys])
{
    if ([[xmlDict valueForKey:string] isKindOfClass:[NSDictionary class]])
    {
        [self fetchValuesFromDictioanry:[xmlDict valueForKey:string]];
    }
    else if ([[xmlDict valueForKey:string] isKindOfClass:[NSString class]])
    {
        if ([string isEqualToString:@"_id"])
        {
            _lblID.text = [xmlDict valueForKey:@"_id"];
            NSLog(@"ZZZ %@",_lblID.text);

            _lblAlert.text = [xmlDict objectForKey:@"_topic"];
            NSLog(@"Make: %@ ",_lblAlert.text);

             _lblxref.text = [xmlDict objectForKey:@"xref"];
             NSLog(@"Make: %@ ",_lblxref.text);

            _lbltext.text = [xmlDict objectForKey:@"text"];
            NSLog(@"Model: %@ ", _lbltext.text);

            _lblgraphic.text = [xmlDict objectForKey:@"explanation"];
            NSLog(@"Model: %@ ",_lblgraphic.text);

            _lblprompt.text = [xmlDict objectForKey:@"prompt"];
            NSLog(@"Model: %@ ",_lblprompt.text);

            _lblvoice.text = [xmlDict objectForKey:@"_id"];
            NSLog(@"Model: %@ ", _lblvoice.text);
        }
       // NSLog(@"MMM: %@ ", [xmlDict valueForKey:string]);

        //Set here other labels
    }
    else if ([[xmlDict valueForKey:string] isKindOfClass:[NSArray class]])
    {
        for (NSDictionary *dictionary in [xmlDict valueForKey:string]) {

            [self fetchValuesFromDictioanry:dictionary];
        }
    }
}
}

现在，当我在lblID和lblAlert等标签中获取值时，它会向我显示值，但是当我尝试获取内部值时，它会显示为null，如lbltext或lblxref。我如何从内部字典中获取值？

Answer 1

用下面的

替换函数fetchValuesFromDictioanry

-(void)fetchValuesFromDictioanry:(NSDictionary*)xmlDict
{
    if ([xmlDict isKindOfClass:[NSDictionary class]])
    {
        for (NSString *string in [xmlDict allKeys])
        {
            if ([[xmlDict valueForKey:string] isKindOfClass:[NSDictionary class]])
            {
                [self fetchValuesFromDictioanry:[xmlDict valueForKey:string]];
            }
            else if ([[xmlDict valueForKey:string] isKindOfClass:[NSString class]])
            {
                if ([string isEqualToString:@"_id"])
                {
                    _lblID.text = [xmlDict valueForKey:string];
                    NSLog(@"ZZZ %@",_lblID.text);
                }
                else if ([string isEqualToString:@"_topic"])
                {
                    _lblAlert.text = [xmlDict objectForKey:string];
                    NSLog(@"Make: %@ ",_lblAlert.text);
                }
                else if ([string isEqualToString:@"xref"])
                {

                    _lblxref.text = [xmlDict objectForKey:string];
                    NSLog(@"Make: %@ ",_lblxref.text);
                }
                else if ([string isEqualToString:@"text"])
                {
                    _lbltext.text = [xmlDict objectForKey:string];
                    NSLog(@"Model: %@ ", _lbltext.text);
                }
                else if ([string isEqualToString:@"explanation"])
                {
                    _lblgraphic.text = [xmlDict objectForKey:string];
                    NSLog(@"Model: %@ ",_lblgraphic.text);
                }
                else if ([string isEqualToString:@"prompt"])
                {
                    _lblprompt.text = [xmlDict objectForKey:string];
                    NSLog(@"Model: %@ ",_lblprompt.text);
                }
                else if ([string isEqualToString:@"_id"])
                {
                    _lblvoice.text = [xmlDict objectForKey:string];
                    NSLog(@"Model: %@ ", _lblvoice.text);
                }

            }
            else if ([[xmlDict valueForKey:string] isKindOfClass:[NSArray class]])
            {
                for (NSDictionary *dictionary in [xmlDict valueForKey:string]) {

                    [self fetchValuesFromDictioanry:dictionary];
                }
            }
        }
    }
    else
    {
        NSLog(@"Not a dictionary")
    }

}

在IOS中从Dictionary中提取数据

1 个答案: