删除带有标记的tableview单元格的子视图

Question

我试图从tableview单元格中删除子视图，我添加了像

subView.tag = 300;
[cell.contentView addSubView:subView];

使用此方法

[cell.contentView viewWithTag:300] performSelector:@selector(removeFromSuperView)];

但它不起作用

这是完整的代码

- (void) tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
{
    //Check if custom subvie already present.If yes, remove and return
    if(![tableView isEditing])
    {
        [[cell.contentView viewWithTag:REORDER_CONTROL_TAG] performSelector:@selector(removeFromSuperview)];
        return;
    }

    //  Grip customization code goes in here...
    UIView* reorderControl = [cell huntedSubviewWithClassName:@"UITableViewCellReorderControl"];

    UIView* resizedGripView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, CGRectGetMaxX(reorderControl.frame), CGRectGetMaxY(reorderControl.frame))];
    resizedGripView.tag = REORDER_CONTROL_TAG;
    [resizedGripView addSubview:reorderControl];
    [cell.contentView addSubview:resizedGripView];

    CGSize sizeDifference = CGSizeMake(resizedGripView.frame.size.width - reorderControl.frame.size.width, resizedGripView.frame.size.height - reorderControl.frame.size.height);
    CGSize transformRatio = CGSizeMake(resizedGripView.frame.size.width / reorderControl.frame.size.width, resizedGripView.frame.size.height / reorderControl.frame.size.height);

    //  Original transform
    CGAffineTransform transform = CGAffineTransformIdentity;

    //  Scale custom view so grip will fill entire cell
    transform = CGAffineTransformScale(transform, transformRatio.width, transformRatio.height);

    //  Move custom view so the grip's top left aligns with the cell's top left
    transform = CGAffineTransformTranslate(transform, -sizeDifference.width / 2.0, -sizeDifference.height / 2.0);

    [resizedGripView setTransform:transform];

    for(UIImageView* cellGrip in reorderControl.subviews)
    {
        if([cellGrip isKindOfClass:[UIImageView class]])
            [cellGrip setImage:nil];
    }
}

我正在学习本教程

http://b2cloud.com.au/how-to-guides/reordering-a-uitableviewcell-from-any-touch-point/

但问题是一旦添加了子视图，我就无法在单元格内的按钮上触摸事件。这就是为什么我试图删除它们

迭代内容视图子视图会发现没有给定标记的子视图。为什么我找不到它？