Local high scores code for iPhone

Does anyone have/know about a "local high scores" function for the iPhone? I know about the various global high score frameworks, but I want something more personal and modest--just for the user/users of the iPhone.

I'm thinking something like: -(UIView*)highScoresForLevel:(unsigned)levelNumber user:(NSString*)userName: score:(unsigned)newScore;

you feed in the current level, user name, and score. It looks up the top 10 in NSUserDefaults (or similar), updates with userName,newScore if necessary, then returns a UIView displaying the scores.

I ask because I figure this must have been done before a couple of million times.

I'm aware of the similar (but less speci开发者_如何转开发fic) SO questions such as: 1, 2 --which were not useful.

Create your custom class with the following class for encoding.

@interface HighScoreClass : NSObject 
{
    NSString * userName;
    NSInteger score;
}
@property (nonatomic,retain) NSString * userName;
@property (nonatomic,assign) NSInteger score;
@end


@implementation HighScoreClass
@synthesize userName;
@synthesize score;

//To encode custom object
- (void)encodeWithCoder:(NSCoder *)coder
{
    [coder encodeObject:userName forKey:@"userName"];
    [coder encodeInteger:score forKey:@"score"];
}

//to decode your custom object
- (id) initWithCoder: (NSCoder *)coder
{
    if (self = [super init])
    {
        self.userName = [coder decodeObjectForKey:@"userName"];
        self.score = [coder decodeIntegerForKey:@"score"];
    }
    return self;
}

-(void)dealloc
{
    [super dealloc];
    [userName release];
}
@end

//To store in NSUserDefaults an array "objectArray" of HighScoreClass objects
[[NSUserDefaults standardUserDefaults] setObject:[NSKeyedArchiver archivedDataWithRootObject:objectArray] forKey:[NSString stringWithFormat@"highScoresForLevel%i",level];


//To retrieve from NSUserDefaults
NSUserDefaults *currentDefaults = [NSUserDefaults standardUserDefaults];
NSData *highScoreArraySavedArray = [currentDefaults objectForKey:[NSString stringWithFormat@"highScoresForLevel%i",level]];
if (highScoreArraySavedArray != nil)
{
    NSArray *oldSavedArray = [NSKeyedUnarchiver unarchiveObjectWithData:highScoreArraySavedArray];
    if (oldSavedArray != nil)
        objectArray = [[NSMutableArray alloc] initWithArray:oldSavedArray];
    else
        objectArray = [[NSMutableArray alloc] init];
}

Then you just need to traverse the retrieved array and sort according to your requirement and display.

Hope this helps.