Connecting cell to controller by responder chain

MyTableViewCell.m

@implementation MyTableViewCell
 
- (IBAction)checkboxPressed:(UIButton *)checkbox event:(UIEvent *)event {
    // Send onwards up the responder chain with the cell as sender
    [UIApplication.sharedApplication sendAction:@selector(cellCheckboxPressed:)
                                             to:nil
                                           from:self
                                          event:event];
}
 
@end

MyTableViewController.m

@implementation MyTableViewController

- (void)cellCheckboxPressed:(MyTableViewCell *)cell {
    // Look up task and work with it
}

@end