Connecting cell to controller using a block

MyTableViewCell.h

@interface MyTableViewCell

@property(nonatomic, copy) void (^checkboxHandler)(void);

@end

MyTableViewCell.m

@implementation MyTableViewCell

- (IBAction)checkboxPressed:(UIButton *)sender {
    self.checkboxHandler();
}

@end

MyTableViewController.m

@implementation MyTableViewController

- (UITableViewCell *)tableView:(UITableView *)table cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    MyTableViewCell *cell = [table dequeueReusableCellWithIdentifier:@"cell"
                                                        forIndexPath:indexPath;
    
    cell.checkboxHandler = ^{
        // Perform the desired work in response to checkbox
    };
    
    return cell;
}

@end