Why is -didDeselectRowAtIndexPath not being called?

Question

I created a fresh project (Xcode 4, Master-Detail application) just to see if I\'m doing something wrong, but I still have the same problem. I want to call -reloadData

Answer 1

When any cell is selected the first time, the -[UITableViewDelegate tableView:didDeselectRowAtIndexPath:] method is not called, but the -[UITableViewDelegate tableView:didSelectRowAtIndexPath:]. Just after selecting one more cell, the didDeselectRowAtIndexPath is called right after the didSelectRowAtIndexPath.

This is OK.

But if you have to show a cell as selected at the begining, (e.q. using UITableViewCellAccessoryCheckmark), then, after selecting another cell you probably want the didDeselectRowAtIndexPath method being called the first time, to deselect the previous cell.

The solution!

You have to call the -[UITableView selectRowAtIndexPath:animated:scrollPosition:] in the -[UITableViewDataSource tableView:cellForRowAtIndexPath:] to notify that a wanted cell is already selected.

Objective-C

#pragma mark - UITableViewDelegate

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
    cell.accessoryType = UITableViewCellAccessoryCheckmark;
    // saving the current selected row
    SelectedRow = indexPath.row;
}

- (void)tableView:(UITableView *)tableView didDeselectRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
    cell.accessoryType = UITableViewCellAccessoryNone;
}

#pragma mark - UITableViewDataSource

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];

    if (!cell) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"cell"];
    }

    // preventing selection style
    cell.selectionStyle = UITableViewCellSelectionStyleNone;

    cell.textLabel.text = "Some text";

    if (indexPath.row == SelectedRow) {
        cell.accessoryType = UITableViewCellAccessoryCheckmark;
        // just wanted to make it selected, but it also can scroll to the selected position
        [tableView selectRowAtIndexPath:indexPath animated:NO scrollPosition:UITableViewScrollPositionNone];
    }

    return cell;
}

Swift 3.1

// MARK: - UITableViewDelegate

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    let cell = tableView.cellForRow(at: indexPath)!
    cell.accessoryType = UITableViewCellAccessoryType.checkmark
    selectedRow = indexPath.row
}

override func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
    let cell = tableView.cellForRow(at: indexPath)!
    cell.accessoryType = UITableViewCellAccessoryType.none
}

// MARK: - UITableViewDataSource

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = UITableViewCell(style: UITableViewCellStyle.default, reuseIdentifier: "cell")

    // preventing selection style
    cell.selectionStyle = UITableViewCellSelectionStyle.none

    cell.textLabel?.text = "some text"

    if (indexPath.row == selectedRow) {
        cell.accessoryType = UITableViewCellAccessoryType.checkmark
        // just wanted to make it selected, but it also can scroll to the selected position
        tableView.selectRow(at: indexPath, animated: false, scrollPosition: UITableViewScrollPosition.none)
    }

    return cell
}