notification
A页面
//向列表页面B发送一个通知 postShopZanCountData
NSMutableDictionary *dic=[[NSMutableDictionaryalloc] init];
[[NSNotificationCenterdefaultCenter] postNotificationName:@"postData"object:niluserInfo:dic];
B 页面
[[NSNotificationCenterdefaultCenter] addObserver:selfselector:@selector(update:) name:@"postData"object:nil];
-(void)update:(NSNotification*)notification{
NSDictionary *dic=notification.userInfo;
}