如何处理UIVIew addsubview 不显示subview

老代码： addsubview不显示uilabel
-(UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section
{
    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0,0,tableView.frame.size.width,50)];
    UILabel *label=[[UILabel new]initWithFrame:CGRectMake(0, 0 ,200, 50)];

    label.text=@"加载更多...";
    label.textColor=[UserSetting getIntance].titleColor;
    label.backgroundColor=[UserSetting getIntance].titleColor;
    [view addSubview:label];
     [view setBackgroundColor:[UserSetting getIntance].mainColor];
    return view;
}
原因在于：addsubview 没有使 UILabel的大小生效
需要在addsuview后面再赋值frame.
新代码如下
-(UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section
{
    UIView *view = [[UIView alloc]     initWithFrame:CGRectMake(0,0,tableView.frame.size.width,50)];
    UILabel *label=[[UILabel new]init];

    label.text=@"加载更多...";
    label.textColor=[UserSetting getIntance].titleColor;
    label.backgroundColor=[UserSetting getIntance].titleColor;
    [view addSubview:label];
    label.frame=CGRectMake(0, 0 ,200, 50);
    [view setBackgroundColor:[UserSetting getIntance].mainColor];
    return view;
}