[[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];

    }

}