Classes/PlayerModel.m

/*
 
 File: PlayerModel.m
 
 Abstract: Provide an example of how to successfully submit scores to leaderboards
 and store them when submission fails.
 
 Version: 1.0
 
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 */
 
#import "PlayerModel.h"
 
@implementation PlayerModel
 
@synthesize storedScores, 
            storedScoresFilename;
 
- (id)init
{
    self = [super init];
    if (self) {
        NSString* path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
        storedScoresFilename = [[NSString alloc] initWithFormat:@"%@/%@.storedScores.plist",path,[GKLocalPlayer localPlayer].playerID];
        writeLock = [[NSLock alloc] init];
    }
    return self;
}
 
- (void)dealloc
{
    [storedScores release];
    [writeLock release];
    [storedScoresFilename release];   
    [super dealloc];
}
 
// Attempt to resubmit the scores.
- (void)resubmitStoredScores
{
    if (storedScores) {
        // Keeping an index prevents new entries to be added when the network is down 
        int index = [storedScores count]-1;
        while( index >= 0 ) {
            GKScore * score = [storedScores objectAtIndex:index];
            [self submitScore:score];
            [storedScores removeObjectAtIndex:index];
            index--;
        }
        [self writeStoredScore];
    }
}
 
// Load stored scores from disk.
- (void)loadStoredScores
{
    NSArray *  unarchivedObj = [NSKeyedUnarchiver unarchiveObjectWithFile:storedScoresFilename];
    
    if (unarchivedObj) {
        storedScores = [[NSMutableArray alloc] initWithArray:unarchivedObj];
        [self resubmitStoredScores];
    } else {
        storedScores = [[NSMutableArray alloc] init];
    }
}
 
 
// Save stored scores to file. 
- (void)writeStoredScore
{
    [writeLock lock];
    NSData * archivedScore = [NSKeyedArchiver archivedDataWithRootObject:storedScores];
    NSError * error;
    [archivedScore writeToFile:storedScoresFilename options:NSDataWritingFileProtectionNone error:&error];
    if (error) {
        //  Error saving file, handle accordingly 
    }
    [writeLock unlock];
}
 
// Store score for submission at a later time.
- (void)storeScore:(GKScore *)score 
{
    [storedScores addObject:score];
    [self writeStoredScore];
}
 
// Attempt to submit a score. On an error store it for a later time.
- (void)submitScore:(GKScore *)score 
{
    if ([GKLocalPlayer localPlayer].authenticated) {
        if (!score.value) {
            // Unable to validate data. 
            return;
        }
        
        // Store the scores if there is an error. 
        [score reportScoreWithCompletionHandler:^(NSError *error){
            if (!error || (![error code] && ![error domain])) {
                // Score submitted correctly. Resubmit others
                [self resubmitStoredScores];
            } else {
                // Store score for next authentication. 
                [self storeScore:score];
            }
        }];
    } 
}
 
@end