Classes/SampleViewController.m

/*
 
 File: SampleViewController.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 "SampleViewController.h"
 
@implementation SampleViewController
 
@synthesize player;
 
- (id)initWithCoder:(NSCoder *)aDecoder 
{
    self = [super initWithCoder:aDecoder];
    
    if (self) {
        context = 0;
    }
    return self;
}
 
- (void) viewDidLoad
{
    [self enableGameCenter:NO];
}
 
- (IBAction)showLeaderboardButtonAction:(id)event 
{
    NSString * leaderboardCategory = @"com.appledts.GameCenterSampleApps.leaderboard.seconds";
 
    // The intent here is to show the leaderboard and then submit a score. If we try to submit the score first there is no guarentee 
    // the server will have recieved the score when retreiving the current list
    [self showLeaderboard:leaderboardCategory];
    [self insertCurrentTimeIntoLeaderboard:leaderboardCategory];
}
 
#pragma mark - 
#pragma mark Example of a score to be inserted
 
// Using time as as an int of seconds from 1970 gives us a good rolling number to test against 
- (void)insertCurrentTimeIntoLeaderboard:(NSString*)leaderboard 
{         
    NSDate *today = [NSDate date];
    int64_t score = [today timeIntervalSince1970];
    GKScore * submitScore = [[GKScore alloc] initWithCategory:leaderboard];
    [submitScore setValue:score]; 
    
    // New feature in iOS5 tells GameCenter which leaderboard is the default per user.
    // This can be used to show a user's favorite course/track associated leaderboard, or just show the latest score submitted.
    [submitScore setShouldSetDefaultLeaderboard:YES];
    
    // New feature in iOS5 allows you to set the context to which the score was sent. For instance this will set the context to be 
    //the count of the button press per run time. Information stored in context isn't accessable in standard GKLeaderboardViewController,
    //instead it's accessable from GKLeaderboard's loadScoresWithCompletionHandler:
    [submitScore setContext:context++];
    
    [self.player submitScore:submitScore];
    [submitScore release];
}
 
// Example of how to bring up a specific leaderboard 
- (void)showLeaderboard:(NSString *)leaderboard 
{
    GKLeaderboardViewController * leaderboardViewController = [[GKLeaderboardViewController alloc] init];
    [leaderboardViewController setCategory:leaderboard];
    [leaderboardViewController setLeaderboardDelegate:self];
    [self presentModalViewController:leaderboardViewController  animated:YES];
    [leaderboardViewController release];
}
 
- (void)leaderboardViewControllerDidFinish:(GKLeaderboardViewController *)viewController  
{
    [self dismissModalViewControllerAnimated: YES];
}
 
// Disable GameCenter options from view 
- (void)enableGameCenter:(BOOL)enableGameCenter 
{
    [showLeaderboardButton setEnabled:enableGameCenter];
}
 
- (void)didReceiveMemoryWarning 
{
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];
    
    // Release any cached data, images, etc that aren't in use.
}
 
- (void)dealloc 
{
    [player release];
    [super dealloc];
}
 
@end