Push a view controller from table embedded in a UIScrollView

Question

The structure for my view is as follows. I display the cover of each chapter of a catalogue in the header view of a UITableView, and display the subsections of each chapter in the corresponding table view.I have these all embedded in a paging UIScrollView which is the rootViewController for a navigation controller. The stack is:

UINavigationController (controlled by CatMainViewController [UIViewController])
    UIScrollView       (controlled by CatMainViewController [UIViewController])
        UITableView    (controlled by SectionViewController [UITableViewController])

I would like to know how I can communicate with the CatMainViewController from the didSelectRowAtIndexPath method on my SectionViewController to tell the navigation controller to push a view controller which loads a document.

I have tried something like:

#import "CatMainViewController.m"
[CatMainViewController.self.navigationController pushViewController:newView animated:YES];

But obviously this hasn't worked out so well. Any help would be greatly appreciated! Thanks.

Answer 1

You can pass a reference of the CatMainViewController instance to the SectionViewController instance, for example:

/* SectionViewController.h */
@class CatMainViewController;

@interface SectionViewController

// ... some properties/methods
@property (nonatomic, assign) CatMainViewController *catMainVC;
// ... more properties/methods

@end

/* SectionViewController.m */
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    // ... some code
    [self.catMainVC.navigationController pushViewController:someVC animated:YES];
}

/* CatMainViewController.m */
#import "SectionViewController.h"

// when creating the SectionViewController
SectionViewController *sectionViewController = ...;
sectionViewController.catMainVC = self;

This is similar to the delegate/@protocol scheme that Apple uses.