Singleton method not getting called in Cocos2d - objective-c

Question

I am calling a Singleton method that does not get called when I try doing this.
I get no errors or anything, just that I am unable to see the CCLOG message.
Under what reasons would a compiler not give you error and not allow you to call a method?
[[GameManager sharedGameManager] openSiteWithLinkType:kLinkTypeDeveloperSite];
The method is defined as follows:
-(void)openSiteWithLinkType:(LinkTypes)linkTypeToOpen
{
CCLOG(#"WE ARE IN openSiteWithLinkType"); //I NEVER SEE THIS MESSAGE
NSURL *urlToOpen = nil;
if (linkTypeToOpen == kLinkTypeDeveloperSite)
{
urlToOpen = [NSURL URLWithString:#"http://somesite.com"];
}
if (![[UIApplication sharedApplication]openURL:urlToOpen])
{
CCLOG(#"%#%#",#"Failed to open url:",[urlToOpen description]);
[self runSceneWithID:kMainMenuScene];
}
}
HERE IS THE CODE TO MY SINGLETON:
#import "GameManager.h"
#import "MainMenuScene.h"
#implementation GameManager
static GameManager* _sharedGameManager = nil;
#synthesize isMusicON;
#synthesize isSoundEffectsON;
#synthesize hasPlayerDied;
+(GameManager*) sharedGameManager
{
#synchronized([GameManager class])
{
if (!_sharedGameManager)
{
[[self alloc] init];
return _sharedGameManager;
}
return nil;
}
}
+(id)alloc
{
#synchronized ([GameManager class])
{
NSAssert(_sharedGameManager == nil,#"Attempted to allocate a second instance of the Game Manager singleton");
_sharedGameManager = [super alloc];
return _sharedGameManager;
}
return nil;
}
-(id)init
{
self = [super init];
if (self != nil)
{
//Game Manager initialized
CCLOG(#"Game Manager Singleton, init");
isMusicON = YES;
isSoundEffectsON = YES;
hasPlayerDied = NO;
currentScene = kNoSceneUninitialized;
}
return self;
}
-(void) runSceneWithID:(SceneTypes)sceneID
{
SceneTypes oldScene = currentScene;
currentScene = sceneID;
id sceneToRun = nil;
switch (sceneID)
{
case kMainMenuScene:
sceneToRun = [MainMenuScene node];
break;
default:
CCLOG(#"Unknown Scene ID, cannot switch scenes");
return;
break;
}
if (sceneToRun == nil)
{
//Revert back, since no new scene was found
currentScene = oldScene;
return;
}
//Menu Scenes have a value of < 100
if (sceneID < 100)
{
if (UI_USER_INTERFACE_IDIOM() != UIUserInterfaceIdiomPad)
{
CGSize screenSize = [CCDirector sharedDirector].winSizeInPixels;
if (screenSize.width == 960.0f)
{
//iPhone 4 retina
[sceneToRun setScaleX:0.9375f];
[sceneToRun setScaleY:0.8333f];
CCLOG(#"GM: Scaling for iPhone 4 (retina)");
}
else
{
[sceneToRun setScaleX:0.4688f];
[sceneToRun setScaleY:0.4166f];
CCLOG(#"GM: Scaling for iPhone 3G or older (non-retina)");
}
}
}
if ([[CCDirector sharedDirector] runningScene] == nil)
{
[[CCDirector sharedDirector] runWithScene:sceneToRun];
}
else
{
[[CCDirector sharedDirector] replaceScene:sceneToRun];
}
}
-(void)openSiteWithLinkType:(LinkTypes)linkTypeToOpen
{
CCLOG(#"WE ARE IN openSiteWithLinkType");
NSURL *urlToOpen = nil;
if (linkTypeToOpen == kLinkTypeDeveloperSite)
{
urlToOpen = [NSURL URLWithString:#"http://somesite.com"];
}
if (![[UIApplication sharedApplication]openURL:urlToOpen])
{
CCLOG(#"%#%#",#"Failed to open url:",[urlToOpen description]);
[self runSceneWithID:kMainMenuScene];
}
}
-(void) test
{
CCLOG(#"this is test");
}
#end

Answer 1

Perhaps sharedGameManager is returning nil? This won't cause an error.
Edit: The issue is in the new code you posted:
if (!_sharedGameManager) {
[[self alloc] init];
return _sharedGameManager;
}
return nil;
If _sharedGameManager is non-nil, this will return nil. You want:
if (!_sharedGameManager) {
[[self alloc] init];
}
return _sharedGameManager;

Answer 2

Check this Cocoa With Love article on how to make a proper singleton.