Question

I have a uitableview that displays the values of an array. I would like to know if there is a way to update the subtitle of its table cells, based on how many times each cell was tapped.

Thank you!

Answer 1

First of all, you’ll want to use a NSMutableArray so you can change its contents after instantiation. Here’s a basic over view of what I just tried to achieve your intended results:

In your interface

@property (strong, nonatomic) NSMutableArray *tapCountArray;

In your implementation

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.tapCountArray = [NSMutableArray new];
    int numberOfRows = 20;

    for (int i = 0; i < numberOfRows; i ++) {
        [self.tapCountArray addObject:@(0)];
    }
}

Then the important part!

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return self.tapCountArray.count;
}

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

    NSString *text = [self.tapCountArray[indexPath.row] stringValue];
    [cell.textLabel setText:text];
    return cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    [self.tapCountArray replaceObjectAtIndex:indexPath.row withObject:@([self.tapCountArray[indexPath.row] intValue] + 1)];
    [self.tableView reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
}

When each cell is tapped the number in its detailTextLabel will be incremented up by one.