[[NSNotificationCenter defaultCenter] postNotificationName:@"postCity" object:pro]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(cityCallBack:) name:@"postCity" object:nil]; - (void)cityCallBack:(NSNotification *)notification { if (nil != notification.object) { ProvinceModel *obj = (ProvinceModel *)notification.object; [addresslbl setText: obj.cityName]; } }