Game Center Score Submission - ios

Question

In GCHelper.h
#import <Foundation/Foundation.h>
#import <GameKit/GameKit.h>
#interface abGCHelper : NSObject {
BOOL gameCenterAvailable;
BOOL userAuthenticated;
}
#property (assign, readonly) BOOL gameCenterAvailable;
-(void)reportScore:(int64_t)score forLeaderboardID:(NSString*)identifier;
#end
In GCHelper.m
#import "abGCHelper.h"
#implementation abGCHelper
#synthesize gameCenterAvailable;
static abGCHelper *_sharedHelper = nil;
-(abGCHelper*)defaultHelper {
// dispatch_once will ensure that the method is only called once (thread-safe)
static dispatch_once_t pred = 0;
dispatch_once(&pred, ^{
_sharedHelper = [[abGCHelper alloc] init];
});
return _sharedHelper;
}
- (BOOL)isGameCenterAvailable {
// check for presence of GKLocalPlayer API
Class gcClass = (NSClassFromString(#"GKLocalPlayer"));
// check if the device is running iOS 4.1 or later
NSString *reqSysVer = #"4.1";
NSString *currSysVer = [[UIDevice currentDevice] systemVersion];
BOOL osVersionSupported = ([currSysVer compare:reqSysVer
options:NSNumericSearch] != NSOrderedAscending);
return (gcClass && osVersionSupported);
}
- (id)init {
if ((self = [super init])) {
gameCenterAvailable = [self isGameCenterAvailable];
if (gameCenterAvailable) {
NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
[nc addObserver:self selector:#selector(authenticationChanged) name:GKPlayerAuthenticationDidChangeNotificationName object:nil];
}
}
return self;
}
- (void)authenticateLocalUserOnViewController:(UIViewController*)viewController
setCallbackObject:(id)obj
withPauseSelector:(SEL)selector
{
if (!gameCenterAvailable) return;
GKLocalPlayer *localPlayer = [GKLocalPlayer localPlayer];
NSLog(#"Authenticating local user...");
if (localPlayer.authenticated == NO) {
[localPlayer setAuthenticateHandler:^(UIViewController* authViewController, NSError *error) {
if (authViewController != nil) {
if (obj) {
[obj performSelector:selector withObject:nil afterDelay:0];
}
[viewController presentViewController:authViewController animated:YES completion:^ {
}];
} else if (error != nil) {
// process error
}
}];
}
else {
NSLog(#"Already authenticated!");
}
}
-(void)authenticationChanged {
if ([GKLocalPlayer localPlayer].isAuthenticated && !userAuthenticated) {
NSLog(#"Authentication changed: player authenticated.");
userAuthenticated = TRUE;
// Load the leaderboard info
// Load the achievements
} else if (![GKLocalPlayer localPlayer].isAuthenticated && userAuthenticated) {
NSLog(#"Authentication changed: player not authenticated.");
userAuthenticated = FALSE;
}
}
-(void)reportScore:(int64_t)score forLeaderboardID:(NSString*)identifier
{
GKScore *scoreReporter = [[GKScore alloc] initWithLeaderboardIdentifier: identifier];
scoreReporter.value = score;
scoreReporter.context = 0;
[GKScore reportScores:#[scoreReporter] withCompletionHandler:^(NSError *error) {
if (error == nil) {
NSLog(#"Score reported successfully!");
} else {
NSLog(#"Unable to report score!");
}
}];
}
I referred to online tutorials to do this. Now, the problem is:
How do I submit the highScore defined in MyScene.m ?
Where do I have to put my Leaderboard ID?
Please help
Thanks...