Question

I’ve got a UITableView displayed on screen for a while. In each cell is a song and artist name. In the background, each song and artist name is searched for online (using the Spotify API). It finds the URL to play one song, and then moves on to the next one! 🙂 Sounds simple… but what I want is when each song is found, for the Checkmark accessory to appear in that row.

Currently i’ve got the following code to do this…

[[table cellForRowAtIndexPath:[NSIndexPath indexPathForRow:currentConnectionNumber inSection:0]] setAccessoryType:UITableViewCellAccessoryCheckmark];
[table setNeedsDisplay];

But all that happens is when all of the songs has been found, THEN the checkmarks appear… Why is this and how can I make the checkmarks appear one at a time?

thanks

Answer 1

You need to set the checkmark in tableView:cellForRowAtIndexPath:

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

    static NSString *reuseIdentifier = @"cell";
    UITableViewCell *cell = nil;

    cell = [tableView dequeueReusableCellForIdentifier:reuseIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:reuseIdentifier] autorelease];
    }

    NSString *cellTitle = [self cellTitleForRowAtIndexPath:indexPath]; // You need to implement this method
    BOOL hasURL = [self hasURLForRowAtIndexPath:indexPath]; // You need to implement this method

    cell.textLabel.text = cellTitle;

    if (hasURL)
        cell.accessoryType = UITableViewCellAccessoryCheckmark;
    else
        cell.accessoryType = UITableViewCellAccessoryNone;

    return cell;
}

Then reload the cells when your request finishes

- (void)myRequestFinished:(SomeKindOfWebRequest *)webRequest {

    NSIndexPath *indexPathToReload = [self indexPathForWebRequest:webRequest]; // You need to implement this method
    NSArray *indexPaths = [NSArray arrayWithObject:indexPathToReload];

    [self.tableView reloadRowsAtIndexPaths:indexPaths withRowAnimtation:UITableViewRowAnimationNone];
}