添加观察者（无参数）：
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(refresh) name:@"update_index_view" object:nil];
发送通知（无参数）：
//根据网络状态，判断首页的显示内容[[NSNotificationCenter defaultCenter] postNotificationName:@"update_index_view" object:nil userInfo:nil];
添加观察者（有参数）：
/刷新首页UI[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(mainThread_handleURLStartup:) name:@"startup_from_url" object:nil];-(void) mainThread_handleURLStartup:(NSNotification *) note{ NSDictionary *info = [note userInfo]; NSString *url_result = [[note userInfo] objectForKey:@"url_result"]; NSLog(@"url_result : %@",url_result); NSLog(@"start from url , information: %@", info); NSString *startupResult = [info objectForKey:@"url_result"]; NSLog(@"startup url result: %@", startupResult);}发送通知（有参数）：
NSString *appIndentier = @"kuainiao://"; NSRange range = NSMakeRange(0, [appIndentier length]); NSLog(@"_startupURL is %@", _startupURL); NSString *schema = [_startupURL substringWithRange:range]; if([schema isEqualToString:appIndentier]) { NSString *startupParam = [_startupURL substringFromIndex:[appIndentier length]]; NSLog(@"startupParam is %@",startupParam); NSDictionary *info = [NSDictionary dictionaryWithObject:startupParam forKey:@"url_result"]; [[NSNotificationCenter defaultCenter] postNotificationName:@"startup_from_url" object:nil userInfo:info]; }