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I have added the UISplitViewController view in my mainViewControllers view, the code is below. documentsRootViewController = [[DocumentsRootViewController alloc] initWithStyle:UITableViewStylePlain]; UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:documentsRootViewController]; documentsRootViewController.title = @"Document List"; documentDetailView = [[DocumentsDetailView alloc] initWithNibName:@"DocumentsDetailView" bundle:nil]; documentsRootViewController.detailViewController = documentDetailView; docSplitViewController = [[UISplitViewController alloc] init]; docSplitViewController.viewControllers = [NSArray arrayWithObjects:navigationController, documentDetailView, nil]; docSplitViewController.delegate = documentDetailView; CGRect splitViewFrame = CGRectMake(0, 0, cetralArea.frame.size.width, cetralArea.frame.size.height); docSplitViewController.view.frame = splitViewFrame; [cetralArea addSubview:docSplitViewController.view]; now what I want is to present a ViewController from the DetailView of the UISplitViewController I am trying to do it as below inside the DetailViewControllers Click Me! buttons click. - (IBAction) buttonClicked:(id)sender { NSString *phrase = nil; // Document password (for unlocking most encrypted PDF files) NSArray *pdfs = [[NSBundle mainBundle] pathsForResourcesOfType:@"pdf" inDirectory:nil]; NSString *filePath = [pdfs lastObject]; assert(filePath != nil); // Path to last PDF file ReaderDocument *readerDocument = [ReaderDocument withDocumentFilePath:filePath password:phrase]; if (readerDocument != nil) // Must have a valid ReaderDocument object in order to proceed with things { ReaderViewController *rViewController = [[ReaderViewController alloc]

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