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POHow to play next track from array
 

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  1. POHow to play next track from array
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    <p>I'm building an app and using spotify. I managed to start and pause a song....But i can't get my head around the playnext button and playprevious button. can some please tell me how to handle these events with the libspotify playbackmanager. I have a playlist view which passes currentsong to my songviewController..How can i call from within my songViewController the next song. This is how i'm calling the currentsong...</p> <pre><code> - (void)viewDidLoad { [super viewDidLoad]; self.playbackManager = [[SPPlaybackManager alloc] initWithPlaybackSession:[SPSession sharedSession]]; [self addObserver:self forKeyPath:@"currentSong.name" options:NSKeyValueObservingOptionInitial context:nil]; [self addObserver:self forKeyPath:@"currentSong.artists" options:NSKeyValueObservingOptionInitial context:nil]; [self addObserver:self forKeyPath:@"currentSong.album.cover.image" options:NSKeyValueObservingOptionInitial context:nil]; [SPTrack trackForTrackURL:self.currentSong.spotifyURL inSession:[SPSession sharedSession] callback:^(SPTrack *track) { [self.playbackManager playTrack:track callback:^(NSError *error) { if (error) { UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Cannot Play Track" message:[error localizedDescription] delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil]; [alert show]; } }]; }]; } - (void)viewDidUnload { [self trackArtist]; [self trackTitle]; [self coverView]; [self currentSong]; [self removeObserver:self forKeyPath:@"currentSong.name"]; [self removeObserver:self forKeyPath:@"currentSong.artists"]; [self removeObserver:self forKeyPath:@"currentSong.album.cover.image"]; self.playbackManager.playbackSession.playing = NO; [super viewDidUnload]; // Release any retained subviews of the main view. } - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context { if ([keyPath isEqualToString:@"currentSong.name"]) { self.trackTitle.text = self.currentSong.name; } else if ([keyPath isEqualToString:@"currentSong.artists"]) { self.trackArtist.text = [[self.currentSong.artists valueForKey:@"name"] componentsJoinedByString:@","]; } else if ([keyPath isEqualToString:@"currentSong.album.cover.image"]) { self.coverView.image = self.currentSong.album.cover.image; } else { [super observeValueForKeyPath:keyPath ofObject:object change:change context:context]; } } #pragma mark - - (IBAction)playTrack:(id)sender { if (self.playbackManager.isPlaying == NO) { self.playbackManager.isPlaying = YES; } else if (self.playbackManager.playbackSession.playing == YES) { self.playbackManager.isPlaying = NO; } } -(IBAction)nextTrack:(id)sender { NSLog(@"index is : %i",nextIndex); NSLog(@"playlistItems: %i",[currentPlaylist.items count] ); self.nextIndex++; NSLog(@"index is : %i",nextIndex); if (self.playbackManager.isPlaying == YES) self.playbackManager.isPlaying = NO; NSLog(@"0=yes 1=no : %i",_playbackManager.isPlaying); SPPlaylistItem *item = [self.currentPlaylist.items objectAtIndex:self.nextIndex]; if (item.itemClass == [SPTrack class]) { [self.playbackManager playTrack:(SPTrack*)item callback:^(NSError *error) { if (error) { UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Cannot Play Track" message:[error localizedDescription] delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil]; [alert show]; } } ]; } } </code></pre>
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