//下拉列表动画加载-(void)dropDownListAnimation{    SchoolInHandAppDelegate *app = [[UIApplication sharedApplication]delegate];    //每行的高度    everyListHight = 30;    listHight = userCountInFile*everyListHight;    presstimes ++;    if(_dropDownbackView ==nil)    {        _dropDownbackView = [[UIScrollView alloc]init];        [_dropDownbackView autorelease];    }    _dropDownbackView.frame = CGRectMake(49, 180, 223, listHight);    [self.view addSubview:_dropDownbackView];        if(_dropDownListView==nil)    {        _dropDownListView = [[UIScrollView alloc]init];        [_dropDownListView autorelease];    }    _dropDownListView.frame = CGRectMake(0, 0, 223, listHight);    //_dropDownbackView.backgroundColor = [UIColor redColor];    int i;    int n = 0;    //UIColor *color = [UIColor colorWithPatternImage:[UIImage imageNamed:@"listbg.png"]];    for(i = 0; i