if we click on Custom Section Header in UITableView, then move that section to top

Question

I have a Custom Section Header in UITableView, on that section header there placed UIButton on its very right.What i want is, if i click on UIButton, that particular Section Header should scrolls to Top. That's it

Any suggestion, piece of code will be admired.

Answer 1

Step 1: set the size of Section header. Example as follows.

- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section {
    return 55;
}

Step 2: create & return the customized section header.

- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section {
    UIView *aView =[[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 55)];
    UIButton *btn=[UIButton buttonWithType:UIButtonTypeCustom];
    [btn setFrame:CGRectMake(0, 0, 320, 55)];
    [btn setTag:section+1];
    [aView addSubview:btn];
    [btn addTarget:self action:@selector(sectionTapped:) forControlEvents:UIControlEventTouchDown];
    return aView;
}

Step 3: return number of sections. ( for example 10 here )

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 10;
}

Step 4 : number of rows per section. ( for example, 4 rows for each section )

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return 4;
}

Step 5 : create & return cell (UITableViewCell for each Row)

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
        cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
    }
    cell.textLabel.text=[NSString stringWithFormat:@"%i_%i",indexPath.section,indexPath.row];

    return cell;
}

Step 6: add the event to handle the TouchDown on section header.

- (void)sectionTapped:(UIButton*)btn {
    [self.tableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:btn.tag-1] atScrollPosition:UITableViewScrollPositionTop animated:YES];
}