heightForRowAtIndexPath involves many cells

Question

I need to change dynamically the row of a cell. That's why I use selectedIndex variable to store the selected row

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell;

TarModel * tar = self.tarList[indexPath.row];

if (selectedIndex == indexPath.row) {
    static NSString *CellIdentifier = @"detailCell";
    cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
}
else {
    static NSString *CellIdentifier = @"Cell";
    cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
}


// Configure the cell...
cell.textLabel.text = tar.way;

cell.detailTextLabel.text = [NSString stringWithFormat:@"cost: € %@",
                             tar.price];

return cell;
}

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

    [tableView deselectRowAtIndexPath:indexPath animated:YES];
    NSLog(@"indexpath is %d", indexPath.row);
    selectedIndex = indexPath.row;
    isSearching = YES;

    [self.tableView reloadData];

}

and then I change the height of my selected row with this:

-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {

    CGFloat height;

    if(selectedIndex == -1) {
        height = 44.0;
    }
    else if (selectedIndex == indexPath.row) {
        height = 88.0;
    }
    else {
        height = 44.0;
    }

    return height;
}

when I run this code and the first row is selected everything is ok, but if the second (only two rows in mytableview) is selected I get even all the next empty rows with the modified height. Where'I'm getting wrong?

Answer 1

for the update height of cell dynamically you can use below code :

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{

      if (indexPath.row == 1)
          selectedIndex = 150;
      else
          selectedIndex = 44;

      [tbl_news_list reloadData];
}
-(float)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
   return selectedIndex;
}

Answer 2

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (indexPath.row == 0) {
       return 44;
    }
    else if (indexPath.row == 1) {
       return 88;
    }
    else{
       return 0;
    }
}

Answer 3

Use reloadRowsAtIndexPaths inside didSelectRowAtIndexPath

reloadRowsAtIndexPaths will once again reload cells on didSelectRowAtIndexPath.

It worked fine , i expanded clicked row in demo app.:)