StackOverflow2013

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POIos NSDictionary array - grouping values and keys
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copied!<p>I have the following result of <code>NSDictionary</code> of Array</p> <pre><code>Bath = { Keynsham = ( "nsham companies" ); }; Bath = { "Midsomer Norton" = ( "Keynsham companies" ); }; Bath = { "Norton Radstock" = ( "Keynsham taxi companies" ); }; Birmingham = { "Acock's Green" = ( "Acock's Green taxi companies" ); }; Birmingham = { "Alcester Lane's End" = ( "Alcester Lane's End taxi companies" ); }; </code></pre> <p>How can i combine the values and keys so that I end up with only one category as shown below;</p> <pre><code>Bath = { "Norton Radstock" = ( "Keynsham taxi companies" ); "Midsomer Norton" = ( "Keynsham companies" ); Keynsham = ( "nsham companies" ); }; </code></pre> <p>I am not sure if this is the best way to explain it the code is as follows</p> <p>//all Nssarrays allocated/ initialised</p> <pre><code> NSURL *url=[NSURL URLWithString:@"http://y.php"]; NSData *data= [NSData dataWithContentsOfURL:url]; NSMutableArray *json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:Nil]; //instantiate arrays to hold data NSMutableDictionary *dictArray=[[NSMutableDictionary alloc]init]; NSArray *cityName=[[NSArray alloc]init]; NSArray *townName=[[NSArray alloc]init]; NSArray *taxis=[[NSArray alloc]init]; NSArray *ids=[[NSArray alloc]init]; for (int i=0; i<json.count; i++) { //cityName=[[NSMutableArray alloc] initWithCapacity:json.count]; ids = [[json objectAtIndex:i] objectForKey:@"id"]; cityName = [[json objectAtIndex:i] objectForKey:@"cityName"]; townName=[[json objectAtIndex:i] objectForKey:@"townName"]; taxis=[[json objectAtIndex:i] objectForKey:@"taxis"]; NSMutableArray *taxisArray=[[NSMutableArray alloc] initWithObjects:taxis,nil]; NSMutableDictionary *towensdict=[[ NSMutableDictionary alloc] initWithObjectsAndKeys:taxisArray,townName, nil]; NSMutableDictionary *cities1=[[NSMutableDictionary alloc] initWithObjectsAndKeys:towensdict,cityName, nil]; NSLOG (@"%@", cities1) here, gives me the print out above [dictArray addEntriesFromDictionary:cities1 ]; Then I tried Jdodgers solution as follows; NSMutableDictionary *combinedDictionary = [[NSMutableDictionary alloc] init]; for (NSDictionary *currentDictionary in dictArray) { NSArray *keys = [currentDictionary allKeys]; for (int n=0;n<[keys count];n++) { NSMutableDictionary *dictionaryToAdd = [combinedDictionary valueForKey:[keys objectAtIndex:n]]; if (!dictionaryToAdd) dictionaryToAdd = [[NSMutableDictionary alloc] init]; [dictionaryToAdd setValuesForKeysWithDictionary:[currentDictionary valueForKey:[keys objectAtIndex:n]]]; [combinedDictionary setValue:dictionaryToAdd forKey:[keys objectAtIndex:n]]; NSLog(@"%@", currentDictionary); } } </code></pre> <p>//this gives error "unrecognized selector sent to instance", here is the print out</p> <pre><code>combinedDictionary NSMutableDictionary * 0x000000010012e580 currentDictionary NSDictionary *const 0x0000000100116460 dictArray NSMutableDictionary * 0x000000010012e220 [0] key/value pair key id 0x0000000100116460 [0] id value id 0x000000010012e440 [0] id keys NSArray * 0x0000000000000000 </code></pre>

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