How to push a new controller from UITableViewCell

Question

I've got two classes. One is for ItemController (extends UITableViewController) and another is ItemCell (extends 'UITableViewCell').

When each cell is clicked I push a new controller from within ItemController's didSelectRowAtIndexPath.

Additionally, in ItemCell, I've got couple of small buttons with different tag for each cell. When any of these buttons are clicked I want to push a new controller. How can I do this?

self.navigationController.pushViewController from ItemCell doesn't work since it doesn't have navigationController

I would prefer to see a solution in RubyMotion but if not, thats fine too :)

Edit

I've read that delegate can be a solution but I'm not sure how to implement it. This is what I've done

ItemController:

  def tableView(table_view, cellForRowAtIndexPath: index_path)
    data_row = self.data[index_path.row]
    cell = table_view.dequeueReusableCellWithIdentifier(CATEGORY_CELL_ID) || begin
      rmq.create(ItemCell.initWithSomething(self), :category_cell, reuse_identifier: CATEGORY_CELL_ID).get
    end
    cell.update(data_row)
    cell
  end

ItemCell:

class ItemCell < UITableViewCell

  attr_accessor :delegate
  def initWithSomething(delegate)
    @delegate = delegate
  end

  ...use @delegate to push the new controller
end

but I get an error

item_controller.rb:114:in tableView:cellForRowAtIndexPath:': undefined methodinitWithSomething' for ItemCell:Class (NoMethodError)

Answer 1

The general idea is that you cell should tell your view controller that something happened and than is the View Controller that will decided to push the other View Controller.

You can do that with the delegate design pattern:

ItemCell has a delegate property that conform to a protocol. For example

@class ItemCell
@protocol ItemCellDelegate
- (void)itemCellDidClickSubmitButton:(ItemCell *)cell;
@end

@interface ItemCell
@property (nonatomic, weak) id<ItemCellDelegate> delegate
...
@end

In tableView:cellForRowAtIndexPath: you will set the controller as the cell delegate (obviously the view controller should conform to the ItemCellDelegate):

cell.delegate = self

The button on your cell will trigger an IBAction on the cell itself that in turn will call the delegate method

- (IBAction)submitButtonTapped:(id)sender
{
    id <ItemCellDelegate> delegate = self.delegate;
    if ([delegate respondToSelector:@selector(itemCellDidClickSubmitButton:)]) {
        [delegate itemCellDidClickSubmitButton:self];
    } 
}

And obviously in your View Controller you should do something like:

#pragma mark - ItemCellDelegate

- (void)itemCellDidClickSubmitButton:(ItemCell)cell
{
    UIViewController *controller = // Create the view controller to push
    [self.navigationController pushViewController:controller];
}