Connecting cell to controller by delegation

MyTableViewCell.h

@protocol MyTableViewCellDelegate
- (void)tableCellCheckboxPressed:(MyTableViewCell *)cell;
@end

MyTableViewCell.m

@implementation MyTableViewCell

- (IBAction)checkboxPressed:(UIButton *)checkbox {
    [self.delegate tableCellCheckboxPressed:self];
}

@end

MyTableViewController.m

@implementation MyTableViewController

- (void)tableCellCheckboxPressed:(MyTableViewCell *)cell {
    NSIndexPath *row = [self.tableView indexPathForCell:cell];
    // Look up task and work with it
}

@end