iOS Music Player tutorial

[wildchild247]

Hi

I am doing the tutorial here

http://code.tutsplus.com/tutorials/ios-sdk-music-library-access--mobile-6188

I have no errors and I am wondering if anyone could look at my code

Thanks

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

@synthesize musicPlayer;

- (void)viewDidLoad{
    [super viewDidLoad];
    
    musicPlayer = [MPMusicPlayerController iPodMusicPlayer];
    
    [volumeSlider setValue:[musicPlayer volume]];
    
    if ([musicPlayer playbackState] == MPMusicPlaybackStatePlaying) {
        
        [playPauseButton setImage:[UIImage imageNamed:@"pauseButton.png"] forState:UIControlStateNormal];
        
    } else {
        
        [playPauseButton setImage:[UIImage imageNamed:@"playButton.png"] forState:UIControlStateNormal];
    }

    [self registerMediaPlayerNotifications];
}

- (void) registerMediaPlayerNotifications{
    NSNotificationCenter *notificationCenter = [NSNotificationCenter defaultCenter];
    
    [notificationCenter addObserver: self
                           selector: @selector (handle_NowPlayingItemChanged:)
                               name: MPMusicPlayerControllerNowPlayingItemDidChangeNotification
                             object: musicPlayer];
    
    [notificationCenter addObserver: self
                           selector: @selector (handle_PlaybackStateChanged:)
                               name: MPMusicPlayerControllerPlaybackStateDidChangeNotification
                             object: musicPlayer];
    
    [musicPlayer beginGeneratingPlaybackNotifications];
}

- (void) handle_NowPlayingItemChanged: (id) notification{
    MPMediaItem *currentItem = [musicPlayer nowPlayingItem];
    UIImage *artworkImage = [UIImage imageNamed:@"noArtworkImage.png"];
    MPMediaItemArtwork *artwork = [currentItem valueForProperty: MPMediaItemPropertyArtwork];
    
    if (artwork) {
        artworkImage = [artwork imageWithSize: CGSizeMake (200, 200)];
    }
    
    [artworkImageView setImage:artworkImage];
    
    NSString *titleString = [currentItem valueForProperty:MPMediaItemPropertyTitle];
    if (titleString) {
        titleLabel.text = [NSString stringWithFormat:@"Title: %@",titleString];
    } else {
        titleLabel.text = @"Title: Unknown title";
    }
    
    NSString *artistString = [currentItem valueForProperty:MPMediaItemPropertyArtist];
    if (artistString) {
        artistLabel.text = [NSString stringWithFormat:@"Artist: %@",artistString];
    } else {
        artistLabel.text = @"Artist: Unknown artist";
    }
    
    NSString *albumString = [currentItem valueForProperty:MPMediaItemPropertyAlbumTitle];
    if (albumString) {
        albumLabel.text = [NSString stringWithFormat:@"Album: %@",albumString];
    } else {
        albumLabel.text = @"Album: Unknown album";
    }
}

- (void) handle_PlaybackStateChanged: (id) notification{
    MPMusicPlaybackState playbackState = [musicPlayer playbackState];
    
    if (playbackState == MPMusicPlaybackStatePaused) {
        [playPauseButton setImage:[UIImage imageNamed:@"playButton.png"] forState:UIControlStateNormal];
        
    } else if (playbackState == MPMusicPlaybackStatePlaying) {
        [playPauseButton setImage:[UIImage imageNamed:@"pauseButton.png"] forState:UIControlStateNormal];
        
    } else if (playbackState == MPMusicPlaybackStateStopped) {
        
        [playPauseButton setImage:[UIImage imageNamed:@"playButton.png"] forState:UIControlStateNormal];
        [musicPlayer stop];
    }
}

- (void) handle_VolumeChanged: (id) notification{
    [volumeSlider setValue:[musicPlayer volume]];
}



- (IBAction)volumeChanged:(id)sender{
    [musicPlayer setVolume:[volumeSlider value]];
}

- (IBAction)showMediaPicker:(id)sender{
    MPMediaPickerController *mediaPicker = [[MPMediaPickerController alloc] initWithMediaTypes: MPMediaTypeAny];
    
    mediaPicker.allowsPickingMultipleItems = YES;
    mediaPicker.prompt = @"Select songs to play";
}

- (void) mediaPicker: (MPMediaPickerController *) mediaPicker didPickMediaItems: (MPMediaItemCollection *) mediaItemCollection{
    if (mediaItemCollection) {
        
        [musicPlayer setQueueWithItemCollection: mediaItemCollection];
        [musicPlayer play];
    }
}

- (void) mediaPickerDidCancel: (MPMediaPickerController *) mediaPicker{

}

- (IBAction)previousSong:(id)sender{
    [musicPlayer skipToPreviousItem];
}

- (IBAction)playPause:(id)sender{
    if ([musicPlayer playbackState] == MPMusicPlaybackStatePlaying) {
        [musicPlayer pause];
        
    } else {
        [musicPlayer play];
        
    }
}
- (IBAction)nextSong:(id)sender{
    [musicPlayer skipToNextItem];
}

@end

----------

#import <UIKit/UIKit.h>
#import <MediaPlayer/MediaPlayer.h>

@interface ViewController : UIViewController{

    IBOutlet UIImageView *artworkImageView;
    IBOutlet UISlider *volumeSlider;
    IBOutlet UIButton *playPauseButton;

    IBOutlet UILabel *titleLabel;
    IBOutlet UILabel *artistLabel;
    IBOutlet UILabel *albumLabel;
   
}
@property (nonatomic, retain) MPMusicPlayerController *musicPlayer;

- (IBAction)volumeChanged:(id)sender;
- (IBAction)showMediaPicker:(id)sender;
- (IBAction)previousSong:(id)sender;
- (IBAction)playPause:(id)sender;
- (IBAction)nextSong:(id)sender;

- (void) registerMediaPlayerNotifications;

@end

 

[dejo]

What seems to be the problem?

P.S. I suggest you read about Getting Answers

 

[wildchild247]

when I run it the ios simulator pops up and then crashes

I am new to obj C and maybe Ive made a simple mistake

 

[ianray]

If you were to post the crash report, then we might be able to help you more