Hide keyboard when UITextField is inside a TableView Cell

@interface ViewController () {
   UITextField *_textFieldBeingEdited;
}
@end

- (void)textFieldDidBeginEditing:(UITextField *)textField {
   _textFieldBeingEdited = textField;
}

- (void)textFieldDidEndEditing:(UITextField *)textField{
   // no need to resignFirstResponder here.
   _textFieldBeingEdited = nil;
}

- (void)tableView:(UITableView *)tableView
          didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
   if (_textFieldBeingEdited) {
     [_textFieldBeingEdited resignFirstResponder];
   }
   ...
}