Support linked documents in FastPdfKit

DocumentViewController.m

- (void)documentViewController:(MFDocumentViewController *)dvc didReceiveRequestToGoToDestinationNamed:(NSString *)destinationName ofFile:(NSString *)fileName{
    
    // We set the parameters to the MenuViewController that will open the other document as soon as this one is dismissed
    
    [(MenuViewController *)delegate setLinkedDocument:fileName withPage:-1 orDestinationName:destinationName];
    
    // We need to dismiss the document
    [self actionDismiss:nil];
    
}
- (void)documentViewController:(MFDocumentViewController *)dvc didReceiveRequestToGoToPage:(NSUInteger)pageNumber ofFile:(NSString *)fileName{
    
    // We set the parameters to the MenuViewController that will open the other document as soon as this one is dismissed
    
    [(MenuViewController *)delegate setLinkedDocument:fileName withPage:pageNumber orDestinationName:@""];    
    
    // We need to dismiss the document
    [self actionDismiss:nil];
}

MenuViewController.m

-(IBAction)actionOpenPlainDocument:(id)sender {
	//	We are using NSBundle to lookup the file for us, but if you store the pdf somewhere else than the application
	//	bundle, you should use the NSFileManager instead or be able to provide the right file path for the file.
	
        NSString *filePath = [[NSBundle mainBundle]pathForResource:DOC_PLAIN ofType:@"pdf"];
	NSURL *documentUrl = [NSURL fileURLWithPath:filePath];
	
	//
	// Now that we have the URL, we can allocate an istance of the MFDocumentManager class (a wrapper) and use
	// it to initialize an MFDocumentViewController subclass 	
	MFDocumentManager *aDocManager = [[MFDocumentManager alloc]initWithFileUrl:documentUrl];
    
	DocumentViewController *aDocViewController = [[DocumentViewController alloc]initWithDocumentManager:aDocManager];
	[aDocViewController setDocumentId:DOC_PLAIN];   // We use the filename as an ID. You can use whaterver you like, like the id entry in a database or the hash of the document.
	
        // This delegate has been added just to manage the links between pdfs, skip it if you just need standard visualization
        [aDocViewController setDelegate:self];
    
	//	In this example we use a navigation controller to present the document view controller but you can present it
	//	as a modal viewcontroller or just show a single PDF right from the beginning
	// [self presentModalViewController:aDocViewController animated:YES]; 
	
	[[self navigationController]pushViewController:aDocViewController animated:YES];
	
	[aDocViewController release];
	[aDocManager release];
}	

/* This method should be called from the DocumentViewController when you get a link to another document */

-(void)setLinkedDocument:(NSString *)documentName withPage:(NSUInteger)destinationPage orDestinationName:(NSString *)destinationName{
    NSArray *params = [NSArray arrayWithObjects:documentName,destinationName,[NSNumber numberWithInt:destinationPage], nil];
    [self performSelector:@selector(openDocumentWithParams:) withObject:params afterDelay:0.5];
}

/* This method opens a linked document after a delay to let you pop the controller */

-(void)openDocumentWithParams:(NSArray *)params{
    
    // Depending on the link format you need to manage the destination path accordingly to your own application path
    // In this example we are assuming that every document is placed in your application bundle at the same level
    NSString *filePath = [[NSBundle mainBundle]pathForResource:[[[params objectAtIndex:0] lastPathComponent] stringByDeletingPathExtension] ofType:@"pdf"];
	NSURL *documentUrl = [NSURL fileURLWithPath:filePath];    

	MFDocumentManager *aDocManager = [[MFDocumentManager alloc]initWithFileUrl:documentUrl];
    
	DocumentViewController *aDocViewController = [[DocumentViewController alloc]initWithDocumentManager:aDocManager];
	[aDocViewController setDocumentId:[params objectAtIndex:0]];
    
    int page;
    if([[params objectAtIndex:2] intValue] != -1){
        page = [[params objectAtIndex:2] intValue];
    } else {
        // We need to parse the pdf to get the correct page
        page = [aDocManager pageNumberForDestinationNamed:[params objectAtIndex:1]];
    }
    
    [aDocViewController setPage:page];
	[aDocViewController setDocumentDelegate:aDocViewController];
    [aDocViewController setDelegate:self];
    
	[[self navigationController]pushViewController:aDocViewController animated:YES];
	
	[aDocViewController release];
	[aDocManager release];
    
}