NSNotificationCenter随笔

    可在AppDelegate.h中定义，之后可全局使用。

NSNotificationCenter *notificationCenter;

在.m文件中：

- (void)applicationDidFinishLaunching:(UIApplication *)application
{    
	self.notificationCenter = [NSNotificationCenter defaultCenter];
	[notificationCenter addObserver:self selector:@selector(trackNotifications:) name:nil object:nil];

}

- (void) trackNotifications: (NSNotification *) notification
{
	id nname = [notification name];
	
	if([nname isEqual:@"***"])
	{
		......
	}else if([nname isEqual:@"***"])
	{
		......
	}else if([nname isEqual:@"***"])
	{
		......
	}else if([nname isEqual:@"***"])
	{
		......
	}else if([nname isEqual:@"***"])
	{
		......
	}
}

      在别的地方使用的时候，只需要调用[[NSNotificationCenter defaultCenter] postNotificationName:@"about" object:@""];