How to add Section and TableView Cell dynamically

Question

I have a button that when pressed, a tableview section will be added and will also add a new row to that section. How can I implement this programatically?

I have an array of cells.

Here are my codes

- (IBAction)addCell:(id)sender {

    UITableViewCell *newCell = [[UITableViewCell alloc] init];

    counter++;
    [cells addObject:newCell];

    [self.tableView reloadData];
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return [cells count];
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
   return 1;
}


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
      //this is where i want to adjust the row per section
      //this code hide the recent sections, only the current created section appears
      return [cells objectAtIndex:indexPath.row];
}

Answer 1

Hi try reading this:

How to display the UITableView programmatically?

Adding cells programmatically to UITableView

---

Hope this could help you.

Answer 2

First, update your's datamodel(NSArray or mutable). Second, when you want tableview refresh, add a code [self.tableView reloadData];

---

oops, your code some strange uitaleviewDataSource, Delegate Method.

also, your have a some mistake.

why you implements numberOfRowsInSection return 1? very strange.

I apprecated below code.

CASE 1. No has DataModel.

- (IBAction)addCell:(id)sender 
{

    cellRowsCount++;

    [self.tableView reloadData];
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
   return cellRowsCount;
}


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
      static NSString *CellIdentifier = @"Cell";
      UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; 
      if (cell == nil) 
      {
       cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
       reuseIdentifier:CellIdentifier];
      }

     return cell;
   }

your codes, dataModel(NSArray or mutable) does not necessarily need, so I simply rowCount variable added and your rowsCount of tableviewCell has synchronized.

If you wanna with DataModel, below CASE2. refer plz.

---

CASE2. has DataModel.

- (IBAction)addCell:(id)sender 
{

    textCount ++;

    NSString *cellText = [NSString stringWithFormat:"blah %d", textCount];
    [myArray addObject:cellText];

    [self.tableView reloadData];
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
  return [myArray count];
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
  return [[myArray objectAtIndex:section] count];
}


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
  static NSString *CellIdentifier = @"Cell";
  UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; 
  if (cell == nil) 
  {
      cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
                                    reuseIdentifier:CellIdentifier];
  }

  cell.textLabel.text = (NSString *)[myArray objectAtIndex:indexPath.row];

  return cell;
}

Answer 3

You only have to add the new section and the new item to the array that holds the section and the items like so:

- (void)viewDidLoad
{
    [super viewDidLoad];

    animals = @{@"Section 1" : @[@"Item 1", @"Item 2", @"Item 3"],
                @"Section 2" : @[@"Item 1", @"Item 2"]};
}

after that you just reload the tableView wherever your logic needs:

[self.tableView reloadData];