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POParsing a JSON array with dictionaries
 

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    <p>I'm having some trouble getting to the data I want to in the JSON file. Here is a shortened version of the output from my console: </p> <pre><code>{ AUD = { 15m = "125.15547"; 24h = "124.74"; buy = "121.0177"; last = "125.15547"; sell = "123.44883"; symbol = "$"; }; BRL = { 15m = "120.34"; 24h = "120.34"; buy = "120.34"; last = "120.34"; sell = "120.34"; symbol = "R$"; }; CAD = { 15m = "129.08612"; 24h = "131.07"; buy = "128.66227"; last = "129.08612"; sell = "129.08612"; symbol = "$"; }; } </code></pre> <p>I'm trying to parse the file using the built in JSON parsing library. Here is the parser in my <code>viewDidLoad</code> method:</p> <pre><code> _tickerArray = [NSMutableArray array]; NSURL *tickerDataURL = [NSURL URLWithString:@"https://blockchain.info/ticker"]; NSData *jsonData = [NSData dataWithContentsOfURL:tickerDataURL]; NSError *error = nil; NSDictionary *dataDictionary = [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:&amp;error]; NSLog(@"%@", dataDictionary); NSArray *ar = [NSArray arrayWithObject:dataDictionary]; for (NSString *key in [dataDictionary allKeys]) { for (NSDictionary *dict in ar) { TickerData *t; t.currency = [dict objectForKey:key]; t.symbol = [dict objectForKey:@"symbol"]; t.last = [dict objectForKey:@"last"]; [_tickerArray addObject:t]; } } </code></pre> <p>I want to store the currency code (like <code>AUD or BRL</code>) into <code>t.currency</code> along with some of the other data contained in the currency dictionary but now my app is crashing. Error code:</p> <pre><code>NSInvalidArgumentException', reason: '*** -[__NSArrayM insertObject:atIndex:]: object cannot be nil </code></pre> <p>None of the objects seem to get added to the <code>_tickerArray</code></p> <p>Help?</p> <p>EDIT: Getting the keys to display with the proper data populating other fields:</p> <pre><code> NSDictionary *dataDictionary = [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:&amp;error]; NSLog(@"%@", dataDictionary); for (NSString *key in [dataDictionary allKeys]) { NSDictionary *dic=[dataDictionary objectForKey:key]; TickerData *t=[[TickerData alloc] init]; t.currency = key;//EDITED t.symbol = [dic objectForKey:@"symbol"]; t.last = [dic objectForKey:@"last"]; [_tickerArray addObject:t]; } </code></pre>
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