在IOS中解析嵌套的Json

Question

i just get started with Ios programming, and i have to parse a nested Json file and extract the items and lables, the problem is i have to display the list of the items on a tableview and refresh my tableview everytime i click on a row of my table view: i did display the first list of my items but i'm trying to display my nested items and display them on my "new" tableview: here are a simple of my JSON code and my objective-c code:

"results": {
    "items": [
      {
        "id": "0100",
        "label": "Actualités",
        "cover": "http://XXXX_01.jpg",
        "coverFrom": "XXX-03",
        "coverTo": "2031-CCC18",
        "coverOrder": 1,
        "items": [
          {
            "id": "0101",
            "label": "Actualité / Infos",
            "cover": "http://XXXX.jpg",
            "coverFrom": "2014XXX-24",
            "coverTo": "2031-XXXX18",
            "coverOrder": 1,
            "items": [

            ]
          },

and my RootViewContoller contain this code of the function connectionDidFinishiongLoading**

 // we will follow the format of our nested JSON
    NSDictionary *allDataDictionary = [NSJSONSerialization JSONObjectWithData:dataRequest options:0 error:nil];
    NSDictionary *results = [allDataDictionary objectForKey:@"results"];
    NSArray *arrayOfItems = [results objectForKey:@"items"];

    for (NSDictionary *diction in arrayOfItems) {

        //NSArray *ide = [diction objectForKey:@"id"];
        NSString *label = [diction objectForKey:@"label"];

       // add new object founded
        [array addObject:label];

        }
    // reload my tableview

    [[self tableView]reloadData];


   // myParsingResults = [NSJSONSerialization JSONObjectWithData:dataRequest options:nil error:nil];
    [[self tableView]reloadData];

Answer 1

If I understood correctly, try something like that:

NSDictionary *allDataDictionary = [NSJSONSerialization JSONObjectWithData:dataRequest options:0 error:nil];
NSDictionary *results = [allDataDictionary objectForKey:@"results"];
NSArray *array = [results objectForKey:@"items"];

NSMutableArray *arrayLabels = [[NSMutableArray alloc] init];
NSDictionnary *dicoTemp = [array objectAtIndex:0];
while([dicoTemp objectForKey:@"items"])
{
    arrayLabels addObject:[[dicoTemp objectForKey:@"items"] objectForKey:@"label"];
    NSArray *arrayTemp = [dicoTemp objectForKey:@"items"];
    dicoTemp = [arrayTemp objectAtIndex:0]; //I don't know how you JSON ends, you may have to check if [arrayTemp count] > 0. I presumed that at the end, there was no object for key "items"
}

[[self tableView] reloadData];

That a weird nested JSON response, in my opinion.

Answer 2

Try this one...

 NSError *error = nil;

        NSURL *Url = [[NSURL alloc] initWithString:@"Your URL"];

        jsonData = [NSData dataWithContentsOfURL:Url options:NSDataReadingUncached error:&error];

        if(jsonData==Nil){
            UIAlertView * alert=[[UIAlertView alloc]initWithTitle:@"Error" message:@"Please check your internet connection" delegate:self cancelButtonTitle:@"cancel" otherButtonTitles:@"ok", nil];
            [alert show];
        }
        else{

            NSDictionary *dataDictionary =[[NSDictionary alloc]init];
            dataDictionary = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingMutableContainers error:&error];

            [array addObject:[[[dataDictionary objectForKey:@"results"] valueForKey:@"items"] valueForKey:@"label"]];

        }

and reloads your tableview.