Setting Mac OS X menu transparency in Cocoa

+ (void)setSystemMenuTransparent:(BOOL)transparent {
	CFPreferencesSetValue(CFSTR("AppleEnableMenuBarTransparency"), (CFBooleanRef)[NSNumber numberWithBool:transparent], kCFPreferencesAnyApplication, kCFPreferencesCurrentUser, kCFPreferencesAnyHost);
	CFPreferencesSynchronize(kCFPreferencesAnyApplication, kCFPreferencesCurrentUser, kCFPreferencesAnyHost);
	[[NSDistributedNotificationCenter defaultCenter] postNotificationName:@"AppleMenuTransparencyChanged" object:nil];
}

+ (BOOL)systemMenuTransparent {
	BOOL returnValue = NO;
	CFPropertyListRef plr = CFPreferencesCopyValue(CFSTR("AppleEnableMenuBarTransparency"), kCFPreferencesAnyApplication,  kCFPreferencesCurrentUser,  kCFPreferencesAnyHost);
	if (plr != NULL) {
		returnValue = (BOOL)CFBooleanGetValue((CFBooleanRef)plr);
		CFRelease(plr);
	}

	return returnValue;
}