Parse JSON from file.

ParseJSONfromFile.m

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    NSString *path = [[NSBundle mainBundle] pathForResource:@"data" ofType:@"json"];
    NSString *jsonString = [[NSString alloc] initWithContentsOfFile:path encoding:NSUTF8StringEncoding error:NULL];
    NSData *jsonData = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
    NSDictionary *json = [self parseJSON:jsonData];
}

- (NSMutableDictionary *)parseJSON:(NSData *)data
{
    NSError* jsonParsingError;
    return [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&jsonParsingError];
}