How to show leaderboard in iOS 7 - ios

Question

I am using sprite-kit and targeted iOS 7. I want to show leaderboard with button in my MenuScene.
my helper method codes.
#import "GameKitHelper.h"
NSString *const PresentAuthenticationViewController =
#"present_authentication_view_controller";
#interface GameKitHelper()<GKGameCenterControllerDelegate>
#end
#implementation GameKitHelper {
BOOL _enableGameCenter;
}
+ (instancetype)sharedGameKitHelper
{
static GameKitHelper *sharedGameKitHelper;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
sharedGameKitHelper = [[GameKitHelper alloc] init];
});
return sharedGameKitHelper;
}
- (id)init
{
self = [super init];
if (self) {
_enableGameCenter = YES;
}
return self;
}
- (void)showGKGameCenterViewController:
(UIViewController *)viewController
{
if (!_enableGameCenter) {
NSLog(#"Local play is not authenticated");
}
GKGameCenterViewController *gameCenterViewController =
[[GKGameCenterViewController alloc] init];
gameCenterViewController.gameCenterDelegate = self;
gameCenterViewController.viewState =
GKGameCenterViewControllerStateAchievements;
[viewController presentViewController:gameCenterViewController
animated:YES
completion:nil];
}
I want to Leaderboard Button in this class.
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
CGPoint location = [touch locationInNode:self];
SKNode *node = [self nodeAtPoint:location];
if ([node.name isEqualToString:#"start"]) {
MyScene *myScene = [MyScene sceneWithSize:self.size];
[self.view presentScene:myScene transition:[SKTransition pushWithDirection:SKTransitionDirectionLeft duration:0.5]];
}
if ([node.name isEqualToString:#"gameCenter"]) {
//HERE MY LEADERBOARD BUTTON ACTION
//I don't know what i write here...
{
}
I tried so much methods but these working in iOS 6, I targeted iOS 7.
I tried this:
[[GameKitHelper sharedGameKitHelper] showGKGameCenterViewController:self]; Xcode says for self
Incompatible pointer types sending 'GameMenuScene *' to parameter of type 'UIViewController *'

Answer 1

Andrey is right. gameKitHelper means [gameKitHelper sharedGameKitHelper]. like this example
if ([node.name isEqualToString:#"gameCenter"]) {
UIViewController *vc = self.view.window.rootViewController;
[[GameKitHelper sharedGameKitHelper] showGKGameCenterViewController:vc];
}
Keep coding :)

Answer 2

if ([node.name isEqualToString:#"gameCenter"]) {
UIViewController *vc = self.view.window.rootViewController;
[[GameKitHelper sharedGameKitHelper] showGKGameCenterViewController:vc];
}
But actually you should present another ViewController from your ViewController, not from SKScene

Answer 3

Try this, it's easy to implement and works well:
https://github.com/nihalahmed/GameCenterManager
inside viewDidLoad:
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(openLeaderboard)
name:#"TestNotification"
object:nil];
Inside VC:
- (void) openLeaderboard
{
// Open Leaderboards here
}
In your Scene:
[[NSNotificationCenter defaultCenter]
postNotificationName:#"TestNotification"
object:self];