Why doesn't my UITableView use prototypes for cells?

Question

so here is my code and it doesn't work

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier;
    if (indexPath.row == 0)
    {
        // buttonCell
        CellIdentifier = @"buttonCell";
        buttonCell *cell = (buttonCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
        cell.startAddressLabel.text = @"something";

        //cell config
        //debug
        NSLog(@"indexPath.row: %d", indexPath.row);
        NSLog(@"Cell Identifier: %@", CellIdentifier);

        return cell;
    } else if (indexPath.row == 1)
    {
        //mutableCaptionCell date&time
        CellIdentifier = @"mutableCaptionCell";
        mutableCaptionCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];

        //cell config
        cell.infoLabel.text = @"Время и дата";
        cell.contentLabel.text = @"";

        //debug
        NSLog(@"indexPath.row: %d", indexPath.row);

        return cell;

    } else if (indexPath.row == 2)
    {
        //mutableCaptionCell tax
        CellIdentifier = @"mutableCaptionCell";
        mutableCaptionCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];

        //cell config
        cell.infoLabel.text = @"Тариф";
        cell.contentLabel.text = @"";

        //debug
        NSLog(@"indexPath.row: %d", indexPath.row);

      return cell;
    } else if (indexPath.row == 3)
    {
        //mutableCaptionCell car
        CellIdentifier = @"mutableCaptionCell";
        mutableCaptionCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];

        //cell config
        cell.infoLabel.text = @"Выбор машины на карте";
        cell.contentLabel.text = @"";

        //debug
        NSLog(@"indexPath.row: %d", indexPath.row);

        return cell;
    } else if (indexPath.row == 4)
    {
        //wishCell wishlist
        CellIdentifier = @"wishCell";
        WishCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];

        //cell config
        cell.infoLabel.text = @"Пожелания";
        cell.contentLabel.text = @"";

        //debug
        NSLog(@"indexPath.row: %d", indexPath.row);

        return cell;
    } else
    {
        //debug
        NSLog(@"indexPath.row: %d", indexPath.row);
        UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"mutableCaptionCell" forIndexPath:indexPath];

        // Configure the cell...
        cell.textLabel.text = @"ERROR CELL";

        //debug
        //NSLog(@"indexPath.row: %d", indexPath.row);

        return cell;

        ;
    }

}

I have said subclasses of UITableViewCell for each prototype, the reuse identifiers match each prototype, but what I see on runtime looks like the UITableView doesn't use these prototypes. For example, first cell must be huge one with two buttons, but instead it is shown empty. I NSLoged everything, and log show this:

2014-02-18 10:13:51.587 app[1624:70b] indexPath.row: 0
2014-02-18 10:13:51.590 app[1624:70b] Cell Identifier: buttonCell
2014-02-18 10:13:51.594 app[1624:70b] cell: <buttonCell: 0x8b95e00; baseClass = UITableViewCell; frame = (0 0; 320 44); autoresize = W; layer = <CALayer: 0x8b96000>>
2014-02-18 10:13:51.600 app[1624:70b] indexPath.row: 1
2014-02-18 10:13:51.603 app[1624:70b] indexPath.row: 2
2014-02-18 10:13:51.606 app[1624:70b] indexPath.row: 3
2014-02-18 10:13:51.610 app[1624:70b] indexPath.row: 4

but still TableView doesn't use correct prototypes.

I'm trying to use dynamic prototypes as I need to change some cells height at runtime, may be there is a way to do so with static cells ?

Sidenote: Im using Xcode 5 for iOS 7

NeverHopeless NeverHopeless · Accepted Answer · 2014-02-18T06:35:45

My guess is that, you are not initializing your cell, dequeueReusableCellWithIdentifier isn't just enough. It reuses already created cells, so you should first allocate cell if dequeue results in nil.

Possibly:

if (indexPath.row == 0)
{
    // buttonCell
    CellIdentifier = @"buttonCell";
    buttonCell *cell = (buttonCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];


   if(!cell)
   {
      cell = [[UITableViewCell alloc] initWithStyle:UITableViewStylePlain reuseIdentifier:CellIdentifier];
   }

    cell.startAddressLabel.text = @"something";

    //cell config
    //debug
    NSLog(@"indexPath.row: %d", indexPath.row);
    NSLog(@"Cell Identifier: %@", CellIdentifier);

    return cell;
}

Or load cell designed using IB:

if (indexPath.row == 0)
{
    // buttonCell
    CellIdentifier = @"buttonCell";
    buttonCell *cell = (buttonCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];


   if(!cell)
   {
        cell = [[[NSBundle mainBundle] loadNibNamed:@"MyCustomCell" owner:nil options:nil] objectAtIndex:0];   // Assign reuseIdentifier from IB
   }

    cell.startAddressLabel.text = @"something";

    //cell config
    //debug
    NSLog(@"indexPath.row: %d", indexPath.row);
    NSLog(@"Cell Identifier: %@", CellIdentifier);

    return cell;
}

Hope it helps!

Why doesn't my UITableView use prototypes for cells?

2 Answers