Update TableView (RootView) of SplitView - objective-c

Question

In my SplitView application I have some general data in the TableView at startup. When data in the TableView is selected, I want to display detailed data in the TableView at first and when something is selected there, it should be displayed in the DetailView, too. My question concerns the second step: How should I update the data for the TableView and avoid this TableView to disappear when something is selected?

Answer 1

If you are starting with Apple provided MasterDetail application, what it does by default is the following
Creates a split view controller.
On the left hand side it has a UINavigationController
On the right hand side it has DetailViewController
In the AppDelegate it has a UINavigationController with its rootcontroller as MasterViewController. (that is the reason you see MasterViewController) on the left.
The MasterViewController on the left does nothing related to navigation controller by default though. Looks like this is where you want to be able to drill down further and get another drill down view and so on.
Steps you need to take
First create another DrillDownLevel1ViewController which is a subclass of UITableViewController.
In that class, have two properties, one for data and one for reference to DetailViewController.
#property(strong,nonatomic)NSArray *drillDownLevel1Data;
#property(strong,nonatomic)DetailViewController *detailViewController;
In the MasterViewController's didSelectRowAtIndexPath do some thing like this
DrillDownLevel1ViewController *drillDownLevel1ViewController = [[DrillDownLevel1ViewController alloc] init];
drillDownLevel1ViewController.drillDownLevel1Data=[NSArray arrayWithObjects:#"One",#"Two",#"Three", nil];
drillDownLevel1ViewController.detailViewController=self.detailViewController;
[self.navigationController pushViewController:drillDownLevel1ViewController animated:YES];
In the DrillDownLevel1ViewController, you can correctly set numberOfSections, numberOfRows etc
In the cellForRowAtIndexPath of DrillDownLevel1ViewController, set correct value
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"Cell"];
if(cell==nil){
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"Cell"];
}
cell.textLabel.text=[drillDownLevel1Data objectAtIndex:indexPath.row];
return cell;
In the didSelectRowAtIndexPath of DrillDownLevel1ViewController
self.detailViewController.detailItem = [drillDownLevel1Data objectAtIndex:indexPath.row];
[self.detailViewController configureView];
DetailViewController on the right hand side should show you the data now. If it is not, then you can do some debugging as to whether the outlets are connected etc.
I have a simple project which I built, if you want I can email it to you.