How to get values from nested array/ dictionary iOS 7

Question

I fetch values from dictionary and need to display in UITableView, but everything works fine.

On some spot it stops running and shows thread

-[__NSCFString objectAtIndex:]: unrecognized selector sent to instance 0xbfa7670

The code below, which I used to fetch value..

[NSString stringWithFormat:@"%@",[[pageCat1 valueForKeyPath:@"img3"] objectAtIndex:indexPath.row]]

My values are fetched properly in dictionary but lags to display it?

pageCat (
    {
    img3 = "http://xxx.in/images/page_cat_img/75x75/4.jpg";
    name = "PVC Flexible Wires";
    page =         (
                    {
            id =                 {
                text = 1;
            };
            img4 = "http://xxxx.in/images/page_img/75x75/1.jpg";
            name = "SINGLE CORE FLEXIBLE WIRES ABOVE 6 SQMM";
        },
                    {
            id =                 {
                text = 72;
            };
            img4 = "http://xxx.in/images/page_img/75x75/72.jpg";
            name = "SINGLE CORE FLEXIBLE WIRES BELOW 6 SQMM";
        }
    );
},
    {
    img3 = "http://xxx.in/images/page_cat_img/75x75/3.jpg";
    name = "Bare Copper Wires";
    page =         {
        id =             {
            text = 29;
        };
        img4 = "http://xxx.in/images/page_img/75x75/29.jpg";
        name = "Tinned Copper Fuse Wires";
    };
},
    {
    img3 = "http://xxx.in/images/page_cat_img/75x75/48.jpg";
    name = "Properties of Wire";
    page =         {
        id =             {
            text = 85;
        };
        img4 = "http://xxx.in/images/page_img/75x75/85.jpg";
        name = "Wires - Normal, HR - PVC, FR, FRLS & Zero Halogen";
    };
}

)

Actually look at the log value, it has array and set of values.. i can't find whether it is in what form..

Can anyone help me to find the solution??

Thanks, Yazh

what is the actually response can you please show us that you are trying to get value. — Nitin Gohel
– Nitin Gohel, Commented Jun 5, 2014 at 10:58
In tableview, on clicking a cell displays its sub category.. Thread SIGART is show on my code which i mention above. — yazh
– yazh, Commented Jun 5, 2014 at 11:00
pageCat { img3 = "xxxx.in/images/page_cat_img/75x75/38.jpg"; name = Chennai; page = { id = { text = 129; }; img4 = "xxxx.in/images/page_img/75x75/129.jpg"; name = "Consultants In Chennai"; }; } while log pagecat it shows array like this.. Am Miss not sir.. — yazh
– yazh, Commented Jun 5, 2014 at 11:17

Tomer Even · Accepted Answer · 2014-06-05 11:55:22Z

2

it looks like [pageCat1 valueForKeyPath:@"img3"] returns a NSString and not a NSArray like you expect

make sure that it returns a NSArray before applying objectAtIndex:

it seems that pageCat1 is a NSArray so you need to write something like:

NSString *path = pageCat1[0][@"img3"];

...

edited Jun 5, 2014 at 11:55

answered Jun 5, 2014 at 11:00

Tomer Even

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Comments

tilo · Accepted Answer · 2014-06-05 15:25:41Z

As the error already tells, [pageCat1 valueForKeyPath:@"img3"] returns a NSString and you are calling objectAtIndex: on it which is not recognized for this class. Obviously, pageCat1 differs from what you expected.

Try NSLog(@"%@", pageCat1); to see what it really looks like.

// Edit

pageCat1 (as seen in your update) is an NSArray that contains items of type NSDictionary. What you really want to do is NSString *imgURL = [[pageCat1 objectAtIndex:indexPath.row] objectForKey:@"img3"];

Explanation: 1. [pageCat1 objectAtIndex:indexPath.row] returns a NSDictionary 2. [__dictionary__ objectForKey:@"img3"] returns the NSString containing your image URL

yazh · Accepted Answer · 2014-08-08 07:48:51Z

1

Actually I used XML data, for that i used third party to parse data. Its all of third party which parsed alternate data as array and other as non-array. Finally I check the array with

isKindOfClass

and convert it into array. Therefore my problem in app solved. :-)

Thanks to all who help me..

answered Aug 8, 2014 at 7:48

yazh

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Comments

Rox · Accepted Answer · 2014-06-05 11:46:01Z

0

Please try this one:

//Assuming json is your main dictionary    

NSDictionary *pageCat = [json objectForKey:@"pageCat"];
    NSMutableArray *array = [[pageCat valueForKey:@"img3"]mutableCopy];
    NSLog(@"Value=%@", [array objectAtIndex:indexPath.row]);

edited Jun 5, 2014 at 11:46

answered Jun 5, 2014 at 11:16

Rox

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9 Comments

Rox Over a year ago

Can you post here the NSDictionary value please. NSLog(@"pageCat1=%@",pageCat1);

Rox Over a year ago

Please check is it working: NSDictionary *pageCat = [json objectForKey:@"pageCat"]; NSMutableArray *array = [[pageCat valueForKey:@"img3"]mutableCopy]; NSLog(@"Value=%@", [array objectAtIndex:indexPath.row]);

Rox Over a year ago

Okay convert it into NSMutableArray form. Try with this one: NSMutableArray *array = (NSMutableArray *)[pageCat valueForKey:@"img3"]; and after that first print array and if it works fine then try with objectAtIndex.

yazh Over a year ago

yes. Juz look at the log values, it is in different format. so only i can't access values. Can anyone tell me how to fetch it..

Rox Over a year ago

can you write here, what it prints NSLog(@"array=%@",array);

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