prepareForSegue:sender

gistfile1.m

// the user tapped a collection item, load and set the image on the detail view controller
//
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([[segue identifier] isEqualToString:@"showDetail"])
    {
        NSIndexPath *selectedIndexPath = [[self.collectionView indexPathsForSelectedItems] objectAtIndex:0];
        
        // load the image, to prevent it from being cached we use 'initWithContentsOfFile'
        NSString *imageNameToLoad = [NSString stringWithFormat:@"%d_full", selectedIndexPath.row];
        NSString *pathToImage = [[NSBundle mainBundle] pathForResource:imageNameToLoad ofType:@"JPG"];
        UIImage *image = [[UIImage alloc] initWithContentsOfFile:pathToImage];
        
        DetailViewController *detailViewController = [segue destinationViewController];
        detailViewController.image = image;
    }
}

gistfile2.m

// Do some customisation of our new view when a table item has been selected
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Make sure we're referring to the correct segue
    if ([[segue identifier] isEqualToString:@"ShowSpeaker"]) {
        
        // Get reference to the destination view controller
        DDSpeakerViewController *vc = [segue destinationViewController];
        
        // get the selected index
        NSInteger selectedIndex = [[self.tableView indexPathForSelectedRow] row];
        
        // grab the speaker dictionary
        NSDictionary *speaker = [self.speakers objectAtIndex:selectedIndex];
        
        // Pass the name to our view controller
        vc.name = [speaker objectForKey:@"name"];
        
        // Pass the description to our view controller
        vc.description = [speaker objectForKey:@"description"];
        
        // Pass the imagePath to our view controller
        vc.imagePath = [speaker objectForKey:@"image"];
        
        // Pass the organizagtion to our view controller
        vc.organization = [speaker objectForKey:@"organization"];
    }
}