NSAarry to NSDictionary

Question

I have an NSArray that looks like this

NSDictionary *dataDict = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];
NSLog(@"main: %@", [dataDict valueForKey:@"main"]);
main: [{"city": "dallas", "description": "this is my test description"}]

And I am trying to turn it into a NSDictionary so I get get element like [mainDict objectForKey@"city"]

So I tried this

NSLog(@"%@", [[mainArray objectAtIndex:0] objectForKey:@"city"]);

Thinking it would get the first element in mainArray and then the object that I want but I keep getting this error

[__NSCFString objectAtIndex:]: unrecognized selector sent to instance

How can I make the NSAarry into a NSDictionary?

Thanks

mainArray is string not a array so please first convert it into array and then do your code. It will work perfect — Dharmbir Singh, Dec 08 '15 at 08:01
nsdictionary *abc=@{@"city": @"dallas", @"description": @"this is my test description"} — Devang Goswami, Dec 08 '15 at 08:04
@DevangGoswami I am not defining `mainArray` like that, that is what I see when I NSLog it — spen123, Dec 08 '15 at 08:06
Possible duplicate of [Convert NSArray to NSDictionary](http://stackoverflow.com/questions/1414852/convert-nsarray-to-nsdictionary) — Jens, Dec 08 '15 at 08:07
@Jens my question is different than the one you linked to as I am getting my array from a dictionary to start with — spen123, Dec 08 '15 at 08:13
The Content of your question is completely changed. And after the Change it is very unclear. You get a NSDictionary and want to change it into a NSDictionary ?? — Jens, Dec 08 '15 at 08:15
lol just make a for loop to fetch data from it .. for (NSDictionary *d in mainArray){ nslog (@"%@",[d objectForKey :@"key"]); } — Devang Goswami, Dec 08 '15 at 08:16
@Jens I just added a few lines to show I was not declaring the mainArray, I am getting it from another NSDictionary, which was my mistake in not explaining correctly first, but not I think this should be reopened — spen123, Dec 08 '15 at 08:16
@DevangGoswami now I get this error `[__NSCFString countByEnumeratingWithState:objects:count:]: unrecognized selector sent to instance` — spen123, Dec 08 '15 at 08:18
print d put a break point there if that dont work then change loop : for (NSDictionary *d in [[dataDict valueForKey:@"main"] objectAtIndex:0]) — Devang Goswami, Dec 08 '15 at 08:21

score 0 · Answer 1 · answered Dec 08 '15 at 08:19

0

Create a for loop for list when you get response in [{},{}] format that means its a list of elements . Or you can ask your API developer to correct the error .

Any ways simple solution here is :

for (NSDictionary *d in [dataDict valueForKey:@"main"]){ 
NSlog (@"%@",d); 
NSlog (@"%@",[d objectForKey :@"city"]); 
}

answered Dec 08 '15 at 08:19

Devang Goswami

284
3
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That gives this error `[__NSCFString countByEnumeratingWithState:objects:count:]: unrecognized selector sent to instance ` – spen123 Dec 08 '15 at 08:20
for (NSDictionary *d in [[dataDict valueForKey:@"main"] objectAtIndex:0]) – Devang Goswami Dec 08 '15 at 08:21
when I did that it fails on the line of the for loop with this `-[__NSCFString objectAtIndex:]: unrecognized selector sent to instance` – spen123 Dec 08 '15 at 08:22
Log d and paste the value here , Please – Devang Goswami Dec 08 '15 at 08:22
it never gets there with for loop of this `for (NSDictionary *d in [dataDict valueForKey:@"main"])` it also fails on that line – spen123 Dec 08 '15 at 08:24
When I log `NSLog(@"main: %@", [dataDict valueForKey:@"main"]);` I see `main: [{"city": "dallas", "description": "this is my test description"}]` – spen123 Dec 08 '15 at 08:28
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/97258/discussion-between-devang-goswami-and-spenf10). – Devang Goswami Dec 08 '15 at 08:30
Join the chat bro @spenf10 Try out this code ... .pastebin.com/haHm1K60 – Devang Goswami Dec 08 '15 at 08:31

Dharmbir Singh · Answer 2 · 2015-12-08T09:08:31.707

Your error is saying mainarray is not a NSArray, it is NSString. So please check like this

    NSDictionary *dataDict = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];
    NSLog(@"main: %@", [dataDict valueForKey:@"main"]);


    if ([[dataDict valueForKey:@"main"] isKindOfClass:[NSArray class]]) {

        NSArray *mainArray = [dataDict valueForKey:@"main"];

        NSLog(@"City == %@",[[mainArray objectAtIndex:0] objectForKey:@"city"]);
    }else{
        NSLog(@"mainarray is kind of -> %@", NSClassFromString([dataDict valueForKey:@"main"]));
    }

score -3 · Answer 3 · edited Dec 08 '15 at 09:17

-3

NSArray *mainArray = @[@{@"city":@"dallas", @"description":@"this is my test description"}];
 NSLog(@"%@", [[mainArray objectAtIndex:0] objectForKey:@"city"]);

no problem ....

edited Dec 08 '15 at 09:17

Flexo

87,323
22
191
272

answered Dec 08 '15 at 08:07

宋昆达

1

see my addition, that is what I see when I log that main data, I am not defining it that way – spen123 Dec 08 '15 at 08:09

NSAarry to NSDictionary

3 Answers3