使用tableView的HeaderView与footerView遇到的一个问题

今天使用tableView是遇到一个问题，如图

WX20180514-112539.png

这个tableView中使用了footerview和headerView代理方法中我是这么写的

//返回组头view
- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
    TCPersonalAboutModel *aboutModel = self.dataSourceArray[section];
    if (aboutModel.sublist.count <= 0) {
        return nil;
    }
    TCPersonalAboutHeaderView *headerView = [tableView dequeueReusableHeaderFooterViewWithIdentifier:personalAboutHeaderCell];
    if (!headerView) {
        headerView = [[TCPersonalAboutHeaderView alloc] initWithReuseIdentifier:personalAboutHeaderCell];
    }
    return headerView;
}

- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
    TCPersonalAboutModel *aboutModel = self.dataSourceArray[section];
    if (aboutModel.sublist.count <= 0) {
        return 0;
    }
    return 50;
}

//返回组头尾view
- (UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section
{
    TCPersonalAboutModel *aboutModel = self.dataSourceArray[section];
    if (aboutModel.sublist.count <= 0) {
        return nil;
    }

    TCPersonalAboutFooterView *footerview = [tableView dequeueReusableHeaderFooterViewWithIdentifier:personalAboutFooterCell];
    if (!footerview) {
        footerview = [[TCPersonalAboutFooterView alloc] initWithReuseIdentifier:personalAboutFooterCell];
    }
    return footerview;
}

- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section
{
    TCPersonalAboutModel *aboutModel = self.dataSourceArray[section];
    
   if (aboutModel.sublist.count <= 0) {
            return 0;
    }
    
    return 60;
}

出现上边的原因是因为我返回了nil，高度最好也不要设为0；
改正后的代码

//返回组头view
- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
    TCPersonalAboutModel *aboutModel = self.dataSourceArray[section];
    if (aboutModel.sublist.count <= 0) {
        return [[UIView alloc] initWithFrame:CGRectMake(0, 0, CGFLOAT_MIN, CGFLOAT_MIN)];
    }
    TCPersonalAboutHeaderView *headerView = [tableView dequeueReusableHeaderFooterViewWithIdentifier:personalAboutHeaderCell];
    if (!headerView) {
        headerView = [[TCPersonalAboutHeaderView alloc] initWithReuseIdentifier:personalAboutHeaderCell];
    }
    headerView.dataModel = aboutModel;
    return headerView;
}

- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
    TCPersonalAboutModel *aboutModel = self.dataSourceArray[section];
    if (aboutModel.sublist.count <= 0) {
        return CGFLOAT_MIN;
    }
    return 50;
}

//返回组头尾view
- (UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section
{
    TCPersonalAboutModel *aboutModel = self.dataSourceArray[section];
    if (aboutModel.sublist.count <= 0) {
        return [[UIView alloc] initWithFrame:CGRectMake(0, 0, CGFLOAT_MIN, CGFLOAT_MIN)];
    }

    TCPersonalAboutFooterView *footerview = [tableView dequeueReusableHeaderFooterViewWithIdentifier:personalAboutFooterCell];
    if (!footerview) {
        footerview = [[TCPersonalAboutFooterView alloc] initWithReuseIdentifier:personalAboutFooterCell];
    }
    return footerview;
}

- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section
{
    TCPersonalAboutModel *aboutModel = self.dataSourceArray[section];
    
    if (aboutModel.sublist.count <= 2) {
        if (aboutModel.sublist.count <= 0) {
            return CGFLOAT_MIN;
        }
        return 10;
    }
    return 60;
}

感谢坐我旁边的的小二货。。。。