Question

I get this error message:-[MPConcreteMediaItem isEqualToString:]: unrecognized selector sent to instance…

I am creating an NSMutable array of songs from media picker into an array named “array”. This array shows up properly in the tableview (myTable). HOWEVER when I try to segue to the detail view and send the song title to a label on the detail view following this tutorial. I get the crash and error message above.

Appreciate any help, thanks!

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

    if ([[segue identifier] isEqualToString:@"detailView"]) {

    NSIndexPath *indexPath = [self.myTable indexPathForSelectedRow];

    DetailViewController *vc = [segue destinationViewController];

    vc.trackName = [array objectAtIndex:indexPath.row];

    //crashes -[MPConcreteMediaItem isEqualToString:]: unrecognized selector sent to instance

    }

}

- (void)mediaPicker:(MPMediaPickerController *)mediaPicker didPickMediaItems:(MPMediaItemCollection *)mediaItemCollection {

    [array addObjectsFromArray:mediaItemCollection.items];

    [myTable reloadData];

    // mediaItemCollection = nil;

    [mediaPicker dismissViewControllerAnimated:YES completion:nil];

}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    //this method is called to fill out table with data

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell"];

    if (cell == nil) {

    cell = [[UITableViewCell alloc]

    initWithStyle:UITableViewCellStyleDefault

    reuseIdentifier:@"Cell"];

}

    // Configure the cell

    anItem = nil;

    anItem = [array objectAtIndex:indexPath.row];

    cell.textLabel.text = [anItem valueForProperty:MPMediaItemPropertyTitle];

    cell.accessoryType = UITableViewCellAccessoryDetailDisclosureButton;

    return cell;

}

Answer 1

The error looks like that you aren’t calling ‘isEqualToString:’ on a string object… Which superclass has MPConcreteMediaItem