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up vote 0 down vote favorite


I am aware that there is a lot of questions about this topic, and i do apologize for that as i just cant get this to work for my NSMutableArray. I have problem to really understand the sorting and i have been reading documentation

I have an NSMutableArray with the following type of data:

Player name
score
Player name
score
Player name
score
...

It is a combination between a name and a score (NSNumber). I am trying to find a way to sort this based on the score. I have read a lot but i just do not get this to work, i also have problem to understand the sort concept. I have tried to sort the full array but...

I would very much appreciate if someone can give me a short, understandable, explanation of the sort scenario for this and also an example of how to sort this.

Edit: I changed to dictionary, selected the values and was thinking to sort the allObjects (stored as NSNumber in the dict) and then just select the key from the dict based on the sorted object. 

NSArray *allPlayers = [playerResultInTheGame allKeys];
NSArray *allObjects = [playerResultInTheGame allValues];

NSLog(@"allPlayers: %@", allPlayers);
NSLog(@"allObjects: %@", allObjects);

NSMutableArray *sortedArray = [allObjects   sortedArrayUsingSelector:@selector(Compare:)];

I get the following when i run this:

2011-01-16 21:10:08.417 XX[6640:207] playerResultInTheGame: {
Barnspelare = 3;
Vuxenspelare = 3;
}
2011-01-16 21:10:08.418 XX[6640:207] allPlayers: (
Barnspelare,
Vuxenspelare
)
2011-01-16 21:10:08.418 XX[6640:207] allObjects: (
3,
3
)
2011-01-16 21:10:08.419 XX[6640:207] -[NSCFNumber Compare:]: unrecognized selector sent to instance 0x5b26f10
2011-01-16 21:10:08.422 XX[6640:207] * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSCFNumber Compare:]: unrecognized selector sent to instance 0x5b26f10'

Can someone please advice as i do not really understand this?

share|improve this question
1  
Why an array and not a dictionary? – Carl Norum Jan 16 '11 at 18:31
up vote 1 down vote

What you need to do here is to store your scores and player names in a dictionary. Use the player name as the key (unless the same player is included more than once) and the score as the value. Then, sorting the players is as easy as this:

NSDictionary *dict; // initialize dictionary with key/value pairs
NSArray *allPlayers = [dict allKeys];

Sort the allPlayers array however you want, then get the scores out of the dictionary.

share|improve this answer
    
As stated in the question, the OP wants to sort on score, so it would make sense to use the score as the keys and the player names as the values, I suspect. – middaparka Jan 16 '11 at 18:37
1  
Not necessarily. You can still sort by value, but you cannot have multiple keys with the same value (same score, different people). – PengOne Jan 16 '11 at 18:42
    
I do not have multiple keys. I still just dont get the sort to work, anyone that can help me to show how the sort will look like? – PeterK Jan 16 '11 at 19:47

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