Updating DetailViewController from RootController - ipad

Question

I'm trying to create an iPad application with a similar user interface to Apple's Mail application, i.e:
RootView controller (table view) on the left hand side of the split view for navigation with a multiple view hierarchy. When a table cell is selected a new table view is pushed on the left hand side
The new view on the left side can update the detail view.
I can accomplish both tasks, but not together.
I mean I can make a multi-level table view in the RootController.
Or I can make a single-level table view in the RootController which can update the detailViewController.
Can anyone tell me how to make a multi-level table in the RootController which can update a detailViewController?
There is more source code at the link but below is the method in which I presume I have to declare a new detailViewController (which has to be put in the UISplitViewController):
- (void)tableView:(UITableView *)TableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
NSDictionary *dictionary = [self.tableDataSource objectAtIndex:indexPath.row];
//Get the children of the present item.
NSArray *Children = [dictionary objectForKey:#"Children"];
//
if([Children count] == 0) {
/*
Create and configure a new detail view controller appropriate for the selection.
*/
NSUInteger row = indexPath.row;
UIViewController <SubstitutableDetailViewController> *detailViewController = nil;
if (row == 0) {
FirstDetailViewController *newDetailViewController = [[FirstDetailViewController alloc]initWithNibName:#"FirstDetailView" bundle:nil];
detailViewController = newDetailViewController;
}
if (row == 1) {
SecondDetailViewController *newDetailViewController = [[SecondDetailViewController alloc]initWithNibName:#"SecondDetailView" bundle:nil];
detailViewController = newDetailViewController;
}
// Update the split view controller's view controllers array.
NSArray *viewControllers = [[NSArray alloc] initWithObjects:self.navigationController, detailViewController, nil];
splitViewController.viewControllers = viewControllers//nothing happens.....
[viewControllers release];//
}
else {
//Prepare to tableview.
RootViewController *rvController = [[RootViewController alloc]initWithNibName:#"RootViewController" bundle:[NSBundle mainBundle]];
//Increment the Current View
rvController.current_level += 1;
//Set the title;
rvController.current_title = [dictionary objectForKey:#"Title"];
//Push the new table view on the stack
[self.navigationController pushViewController:rvController animated:YES];
rvController.tableDataSource = Children;
[rvController.tableView reloadData]; //without this instrucion,items won't be loaded inside the second level of the table
[rvController release];
}
}

Answer 1

Sorry, but I cannot post my source code as it contains sensitive information. When I have more time available I will create a separate project and upload the code somewhere.
Here are extracts of how I have done it so far (I welcome any feedback).
The RootViewController - Note I have 4 sections in my root table.
#pragma mark -
#pragma mark Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
[tableView deselectRowAtIndexPath:indexPath animated:YES];
// Detail view logic
NSUInteger section = indexPath.section;
UIViewController <SubstitutableDetailViewController> *detailViewController = nil;
if (section == 2) {
ProductSearchDetailView *viewController = [[ProductSearchDetailView alloc] initWithNibName:#"ProductSearchDetailView" bundle:nil];
detailViewController = viewController;
//[viewController release];
}
else {
DetailViewController *defaultDetailViewController = [[DetailViewController alloc] initWithNibName:#"DetailView" bundle:nil];
detailViewController = defaultDetailViewController;
//[defaultDetailViewController release];
}
// Navigation logic
switch (section) {
case 0:
{
break;
}
case 1:
{
break;
}
case 2:
{
// new Navigation view
ProductSearchViewController *viewController = [[ProductSearchViewController alloc] initWithNibName:#"ProductSearchViewController" bundle:nil];
viewController.navigationItem.backBarButtonItem.title = #"Back";
[self.navigationController pushViewController:viewController animated:YES];
[viewController release];
break;
}
case 3:
{
StoreLocatorNavController *viewController = [[StoreLocatorNavController alloc] initWithNibName:#"StoreLocatorNavController" bundle:nil];
viewController.navigationItem.backBarButtonItem.title = #"Back";
[self.navigationController pushViewController:viewController animated:YES];
[viewController release];
break;
}
}
// Update the split view controller's view controllers array.
NSArray *viewControllers = [[NSArray alloc] initWithObjects:self.navigationController, detailViewController, nil];
splitViewController.viewControllers = viewControllers;
[viewControllers release];
// Dismiss the popover if it's present.
if (popoverController != nil) {
[popoverController dismissPopoverAnimated:YES];
}
// Configure the new view controller's popover button (after the view has been displayed and its toolbar/navigation bar has been created).
if (rootPopoverButtonItem != nil) {
[detailViewController showRootPopoverButtonItem:self.rootPopoverButtonItem];
}
[detailViewController release];
}
NSNotificationCenter part
Add this to ProductSearchViewController:
#pragma mark -
#pragma mark Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
NSDictionary *itemAtIndex = (NSDictionary *)[self.productResults objectAtIndex:indexPath.row];
[[NSNotificationCenter defaultCenter] postNotificationName:#"updateProduct" object:itemAtIndex];
}
And finally, add this to ProductSearchDetailViewController:
- (void)viewDidLoad {
[super viewDidLoad];
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(updateTheProductDetails:) name:#"updateProduct" object:nil];
}
- (void)updateTheProductDetails:(NSNotification *)notification {
NSDictionary *productDictionary = [NSDictionary dictionaryWithDictionary:[notification object]];
// product name
_productName.text = [productDictionary objectForKey:#"ProductDescription"];
}
Hope it helps!