button in UITableViewCell class to call method on main UIViewController

you can assign a method from your controller to a button from UITableView in your - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath method

[cell.yourButton addTarget:self action:@selector(updateLabels) forControlEvents:UIControlEventTouchUpInside];
(just don't forget to add IBOutlet of your button to your custom cell class)
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