How to get a value from a delegate and reload a view

I'm developing an iPad app, and it's the first time I put the popover view 开发者_StackOverflowto good use. I'm using the popover view as a menu with categories, and only have 1 screen with video's. When the user selects a category, the 'FeaturedViewController' has to reload the view with the new playlistId.

When a user selects a category, it's easy to do: double playlistId = [[playlists.items objectAtIndex:indexPath.row] playlistId];

But how do I get that playlistId in my FeaturedViewController and reload the view?

in your FeaturedViewController.m

- (void)viewDidLoad 
{
     //create reference of your delegate
    YourAppDelegate rootApp = (YourAppDelegate *)[[UIApplication sharedApplication]delegate];

     double playlistId = [[[[rootApp playlists] items] objectAtIndex:indexPath.row] playlistId ];
    [super viewDidLoad];
}

EDITED

Or you can define a property in FeaturedViewController and assign value in this VC like :

FeaturedViewController  nextView = [[FeaturedViewController alloc] initWithNibName:@"FeaturedViewController" bundle:nil];
 //below lineset the value of property and you can pass value to nextView
    nextView.playlistId = [[playlists.items objectAtIndex:indexPath.row] playlistId]; ;
    [self.navigationController pushViewController:nextView animated:YES];

hope it gives you idea to access variable of delegate

Look:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
// load new playlist
BCPlaylist *playlist = (BCPlaylist *) [playlists.items objectAtIndex:indexPath.row];
NSNumber *key = [NSNumber numberWithDouble:playlist.playlistId];
NSLog(@"Key: %@", key);
FeaturedViewController *nextView = [[FeaturedViewController alloc] initWithNibName:nil bundle:nil];
nextView.PLID = key;
[self.navigationController pushViewController:nextView animated:YES];
[nextView release];
}

The Key NSlogs correctly, but i dont get a response from nextView.PLID in the FeaturedViewController at all.