Transferring information between views stopped after I applied the changes of this lesson.

#import "PlaylistMasterViewController.h"
#import "PlaylistDetailViewController.h"
#import "Playlist.h"


@interface PlaylistMasterViewController ()

@end

@implementation PlaylistMasterViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    for (NSUInteger index =0; index < self.playlistImageViews.count; index++) {

        Playlist *playlist = [[Playlist alloc] initWithIndex:index];
        UIImageView *playlistImageView = self.playlistImageViews[index];

        playlistImageView.image = playlist.playlistIcon;
        playlistImageView.backgroundColor  = playlist.backgroundColor;
    }
}


- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}


        - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
            if ([segue.identifier isEqualToString:@"showPlaylistDetail"]) {

                UIImageView *playlistImageView = (UIImageView *)[sender view];
                if ([self.playlistImageViews containsObject:playlistImageView]) {
                    NSUInteger index = [self.playlistImageViews indexOfObject:playlistImageView];

                    PlaylistDetailViewController *playlistDetailController = (PlaylistDetailViewController *)segue.destinationViewController;
                    playlistDetailController.playlist = [[Playlist alloc] initWithIndex:index];
                }

    }
}


- (IBAction)showPlaylistDetail:(id)sender {

    [self performSegueWithIdentifier:@"showPlaylistDetail" sender:sender];


}



@end