iPhone and iPad version in one?

I have developed an iPhone application and now I would like to implement a UISplitViewController which will launch on startup if the application is being run on an iPad.

To get the split view to start working I have copied most of the code from the MultipleDetailViews project from Apple.

I have a few questions, if I may:

• 1) Is it possible to re-use the classes I created for the iPhone application to display as the "detail" view of the split view controller?
• 2) I have the split view controller loading programmatically, but the little button to present the popover doesn't appear. I have tried many ways and debugged, and the code that runs to present the popover button is running, but nothing happens. Any ideas?
• 3) I have created a .xib that is correctly wired up with a splitviewcontroller. Is it possible to get this xib to load at startup instead of programmatically creating the splitviewcontroller?

On launching - this is the code that I am currently using:

    // manually create a split view controller
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
{
    // launch the ipad view
    RootViewControllerPad *firstVC = [[[RootViewControllerPad alloc]
                                       initWithNibName:nil bundle:nil] autorelease];


    IndicatorsPad* secondVC = [[[IndicatorsPad alloc]
                                         initWithNibName:@"IndicatorsPad" bundle:nil] autorelease];


    splitViewCtrl = [[UISplitViewController alloc] init];
    splitViewCtrl.viewControllers = [NSArray arrayWithObjects:firstVC, secondVC, nil];

    self.window.rootViewController = self.splitViewCtrl;
    [window addSubview:splitViewCtrl.view];

}

The split view containers shows up, but like I say, it's not working properly. It should automatically present a button for the popover when the orientation changes to portrait, and it's not doing this.

When I select one of the items on the left menu, it doesn't bring up the required xib in the detail view even though the code is (probably) correct:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

/*
 Create and configure a new detail view controller appropriate for the selection.
 */
NSUInteger row = indexPath.row;

NSLog(@"Row %i selected",row);

UIViewController <SubstitutableDetailViewController> *detailViewController = nil;

if (row == 5) {
    IndicatorsPad *newDetailViewController = [[IndicatorsPad alloc] initWithNibName:@"IndicatorsPad" bundle:nil];
    detailViewController = newDetailViewController;
}

if (row == 6) {
    SensPad *newDetailViewController = [[SensPad alloc] initWithNibName:@"SensPad" 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;
[viewControllers release];

// Dismiss the popover if it's present.
if (popoverController != nil) {
    [popoverControl开发者_JAVA百科ler 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];

}

I've spent a couple of days on this problems and really would appreciate the guidance. I have read several of the questions and answers in this forum and have reached the point where I feel that I need to ask these specific questions.

Thanks a lot.