iOS: geojson iOS access - ios

Question

Developing for the iPad, I have created a file that i call Coordinates.geojson. I would like to access it from within a classfile called JsonDecoder.m
Here is JsonDecoder.m
#implementation JsonDecoder
- (id)initWithJson
{
NSString *filePath = [[NSBundle mainBundle] pathForResource:#"Coordinates" ofType:#"geojson"];
NSData *data = [NSData dataWithContentsOfFile:filePath];
NSError *error;
_json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
return self;
}
- (NSArray*) getCoordinatesFromShelf:(NSString *) bookShelfName
{
NSArray *coordinates = [[[_json objectForKey:#"shelf1"] objectForKey:#"coordinates"]objectAtIndex:1];
for(id i in coordinates)
NSLog(#"%#",i);
return coordinates;
}
#end
And my Coordinates.geojson:
{
"shelf1": {
"name": "six.png",
"coordinates": [
[
14,
25,
329,
138
],
[
14,
185,
329,
138
],
[
14,
344,
158,
138
],
[
185,
344,
158,
138
],
[
14,
94,
158,
138
],
[
185,
500,
158,
138
]
]
}
}
How can i retreive these values from within a class file?
Thanks!

Answer 1

In iOS >= 5 you can parse it without external libraries
NSString *filePath = [[NSBundle mainBundle] pathForResource:#"Coordinates" ofType:#"geojson"];
NSData *data = [NSData dataWithContentsOfFile:filePath];
NSError *error;
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
But the content of the file isn't a valid JSON string.
If possible change it to something like:
{
    "shelf1": {
        "name": "six.png",
        "coordinates": [
            [
                14,
                25,
                329,
                138
            ],
            [
                14,
                185,
                329,
                138
            ],
            [
                14,
                344,
                158,
                138
            ],
            [
                185,
                344,
                158,
                138
            ],
            [
                14,
                94,
                158,
                138
            ],
            [
                185,
                500,
                158,
                138
            ]
        ]
    }
}
Then you can access it with:
NSDictionary *shelf1 = [json objectForKey:#"shelf1"];
//OR
NSArray *coordinates = [[json objectForKey:#"shelf1"] objectForKey:#"coordinates"];

Answer 2

Solved it.
The above worked perfectly
I had forgot to set target membership to my project for the geojson file.
To do this, mark your jsonfile, click on the fileinspector and toogle the checkbox of your project at "Target Membership"
Thanks.