iOS JSon parsing, array in array

Question

I have a simple json format with an array within an array, but I can't figure out how to get the inner array. How do I grab the "Commute" tag as an NSArray or a NSDictionary?

Here is my json:

{
    "Language": "EN",
    "Place": [
        {
            "City": "Stockholm",
            "Name": "Slussen",
            "Commute": [
                "Subway",
                "Bus"
            ]
        },
        {
            "City": "Gothenburg",
            "Name": "Central station",
            "Commute": [
                "Train",
                "Bus"
            ]
        }
    ]
}

Here is my code:

NSString *textPath = [[NSBundle mainBundle] pathForResource:@"Places" ofType:@"json"];

NSError *error;
NSString *content = [NSString stringWithContentsOfFile:textPath encoding:NSUTF8StringEncoding error:&error];  //error checking omitted

NSData *jsonData = [content dataUsingEncoding:NSUTF8StringEncoding];

NSDictionary* json = [NSJSONSerialization
                      JSONObjectWithData:jsonData
                      options:kNilOptions
                      error:&error];

NSArray* AllPlaces = [json objectForKey:@"Place"];

for(int n = 0; n < [AllPlaces count]; n++)
{
    PlaceItem* item     = [[PlaceItem alloc]init];
    NSDictionary* place = [AllPlaces objectAtIndex:n];
    item.City           = [place objectForKey:@"City"];
    item.Name           = [place objectForKey:@"Name"];

    NSDictionary* commutes = [json objectForKey:@"Commute"];

    [self.placeArray addObject:(item)];
}

Please find another one-line method to get all you want below — malex
– malex, Commented Jan 14, 2014 at 11:13

Kendall Helmstetter Gelner · Accepted Answer · 2013-02-18 22:37:51Z

2

Your code should be:

NSArray* commutes = [place objectForKey:@"Commute"];

Thwt would give back an array holding "Subway" and "Bus".

edited Feb 18, 2013 at 22:37

answered Feb 18, 2013 at 19:29

Kendall Helmstetter Gelner

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1 Comment

Till Over a year ago

Most likely a typo but that json dictionary does not contain an element keyed by "Commute".

tom · Accepted Answer · 2013-02-18 19:33:25Z

2

NSArray *commutes = [place objectForKey:@"Commute"];

This will give you an NSArray with "Subway" and "Bus".

answered Feb 18, 2013 at 19:33

tom

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Comments

Gereon · Accepted Answer · 2013-02-18 19:33:13Z

1

I think the problem is the access to json, it should be place instead:

NSArray* commutes = [place objectForKey:@"Commute"];

answered Feb 18, 2013 at 19:33

Gereon

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malex · Accepted Answer · 2014-01-14 11:10:08Z

0

You can considerably shrink you code using KVC Collection Operators:

NSArray *commutes = [json valueForKeyPath:@"[email protected]"];

If you want all repeated commutes use @unionOfArrays modifier.

answered Jan 14, 2014 at 11:10

malex

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