Question

it’s my first question in this awesome site. I’ve really searched a lot and yet find an answer to the next problem.

I have a table view with 9 cells. One of the cells has a switch button in it. When the switched button value changes, i want to delete 2 rows of the table view. I have written the next code:

- (IBAction)switchValueChanged:(id)sender {
NSLog(@"%@", ([switch isOn]) ? @"ON" : @"OFF"); 

NSArray *deleteIndexPaths = [NSArray arrayWithObjects:
                             [NSIndexPath indexPathForRow:1 inSection:0],
                             [NSIndexPath indexPathForRow:2 inSection:0],
                             nil];

UITableView *tableView = (UITableView *)self.view;

[tableView beginUpdates];

[tableView deleteRowsAtIndexPaths:deleteIndexPaths withRowAnimation:UITableViewRowAnimationFade];
// I Have to change the number of rows in the section here.

[tableView endUpdates];
}

When i run this, I’m getting a problem relating to the number of rows in the section – this number has been changed so i need to change it. I really can’t find how i change it, but i know where i have to change it (see code).

How can i do it? how can i call the method numberOfRowsInSection:NSInteger and set also the rows?

Thank you very much 🙂

Answer 1

The number of rows in the table is in your

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section

You need this to match the new number of rows in the table

—- EDIT

This means that you will need to keep track of the number of rows in your table.

Start with this set to 9 and delete 2 every time you change the switch

- (IBAction)switchValueChanged:(id)sender {
  NSLog(@"%@", ([switch isOn]) ? @"ON" : @"OFF");

  // We are going to delete 2 rows
  numberOfRows -= 2;
  ...

and in your numberOfRowsInSection instead of returning 9 each time, return the new number of rows

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