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You can initialize a media player s state using the repeatMode and shuffleMode properties If you do not set these properties, your player s state is the user s iPod application state Other properties you can use to obtain information about a media player are the nowPlayingItem, currentPlaybackTime, and playbackState properties The nowPlayingItem property is an MPMediaItem that represents the currently playing media item The currentPlaybackTime is an NSInterval containing the now-playing item s playback location in seconds The playbackState property returns the music player s playback state as an MPMusicPlaybackState Valid values for these states include MPMusicPlaybackStateStopped, MPMusicPlaybackStatePlaying, MPMusicPlaybackStatePaused, MPMusicPlaybackStateInterrupted, MPMusicPlaybackState SeekingForward, and MPMusicPlaybackStateSeekingBackward Methods you can use to control a media player are play, pause, stop, beginSeekingForward, beginSeekingBackward, endSeeking, skipToNextItem, skipToBeginning, and skipToPreviousItem The play, pause, and stop methods should be self-explanatory The beginSeekingForward and beginSeekingBackward methods are for fast-forwarding and rewinding, respectively, while the endSeeking method stops fast-forwarding or rewinding The skipToNextItem, skipToPreviousItem, and skipToBeginning methods should also be self-explanatory The MPMusicPlayerController has no delegate protocol for responding to its events Instead it provides two notifications: the MPMusicPlayerControllerPlaybackStateDidChange and MPMusicPlayerControllerNowPlayingItemDidChange notifications The first notification posts when an MPMusicPlayerController s playback state changes The second notification posts when an MPMusicPlayerController s now-playing media item changes By using these two notifications, your application can respond to the media player s state, as the next example task illustrates
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Using the Media Picker and Media Player
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1 Create a new View-based Application; name it iPodSongs 2 Add the Media Player framework (MediaPlayerframework) to the project s frameworks 3 Add the player_stoppng, player_pausepng, player_playpng, player_rewpng and player_
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fwdpng images from the sample code Resources folder to the project s Resources folder
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4 Open iPodSongsViewController and add four IBOutlets: three for UILabels and one for
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a UIView Name the outlets currentTitle, currentArtist, currentLengthInSeconds, and volumeView
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5 Add an IBAction named selectSongs Don t implement selectSongs yet Add an IBAction
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named changeState (Listings 18-5 and 18-6)
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(continued)
iOS SDK Programming: A Beginner s Guide
Listing 18-5
iPodSongsViewControllerh
#import <UIKit/UIKith> #import <MediaPlayer/MediaPlayerh> @class MyMediaPickerDelegate; @interface iPodSongsViewController : UIViewController { MyMediaPickerDelegate * mediaControllerDelegate; MPMediaLibrary * mediaLib; UILabel * currentTitle; UILabel * currentLengthInSeconds; MPMusicPlayerController * player; UIView * volumeView; MPVolumeView * mpVolumeView; } @property (nonatomic, retain) MyMediaPickerDelegate *mediaControllerDelegate; @property (nonatomic, retain) MPMediaLibrary * mediaLib; @property (nonatomic, retain) IBOutlet UILabel * currentTitle; @property (nonatomic, retain) IBOutlet UILabel * currentArtist; @property (nonatomic, retain) IBOutlet UILabel * currentLengthInSeconds; @property (nonatomic, retain) MPMusicPlayerController * player; @property (nonatomic, retain) IBOutlet UIView * volumeView; - (IBAction) selectSongs : (id) sender; - (IBAction) changeState: (id) sender; @end
Listing 18-6
iPodSongsViewControllerm
#import "iPodSongsViewControllerh" #import "MyMediaPickerDelegateh" @implementation iPodSongsViewController @synthesize mediaControllerDelegate; @synthesize mediaLib; @synthesize currentTitle; @synthesize currentArtist; @synthesize currentLengthInSeconds; @synthesize player; @synthesize volumeView; int currentItem = 0; -(void) viewDidLoad { [MPMediaLibrary defaultMediaLibrary]; [[NSNotificationCenter defaultCenter] addObserver:self selector: @selector(songsPicked:) name:@"SongsPicked" object:nil]; [[NSNotificationCenter defaultCenter] addObserver:self selector: @selector(songChanged) name: @"MPMusicPlayerControllerNowPlayingItemDidChangeNotification" object:nil];
18:
Multimedia
mpVolumeView = [[MPVolumeView alloc] init]; [mpVolumeView setFrame:[selfvolumeView bounds]]; [selfvolumeView addSubview:mpVolumeView]; } -(void) songsPicked: (NSNotification *) notification { player = [MPMusicPlayerController applicationMusicPlayer]; playerrepeatMode = MPMusicRepeatModeNone; playershuffleMode = MPMusicShuffleModeOff; [player setQueueWithItemCollection:(MPMediaItemCollection *) [notification object]]; [player beginGeneratingPlaybackNotifications]; [player play]; } -(void) songChanged { MPMediaItem * tempMediaItem = (MPMediaItem *)playernowPlayingItem; [selfcurrentTitle setText:[tempMediaItem valueForProperty: MPMediaItemPropertyTitle]]; [selfcurrentArtist setText: [tempMediaItem valueForProperty: MPMediaItemPropertyArtist]]; [selfcurrentLengthInSeconds setText: [NSString stringWithFormat:@"%i", [tempMediaItem valueForProperty:MPMediaItemPropertyPlaybackDuration]]]; } -(IBAction) changeState: (id) sender { NSInteger num = ((UIControl*)sender)tag; switch (num) { case 1: [player pause]; break; case 2: [player play]; break; case 3: [player stop]; break; case 4: [player skipToPreviousItem]; break; case 5: [player skipToNextItem]; break; } } -(IBAction) selectSongs: (id) sender { MPMediaPickerController * mediaController = [[MPMediaPickerController alloc] init]; mediaControllerallowsPickingMultipleItems = YES; mediaControllerdelegate = [[MyMediaPickerDelegate alloc] init]; [self presentModalViewController:mediaController animated:YES]; } -(void)dealloc { [[NSNotificationCenter defaultCenter] removeObserver:self]; [mediaControllerDelegate release]; [player stop]; [mpVolumeView release]; [super dealloc]; } @end
(continued)
iOS SDK Programming: A Beginner s Guide
Figure 18-2
The application s canvas in Interface Builder
6 Save your changes and open iPodSongsViewControllerxib Create a button and connect its
Touch Up Inside event to the selectSongs method
7 Create five buttons and add an image to each button (Figure 18-2) Assign each button a
unique tag in the Inspector Connect the five buttons to the changeState action
8 Add three labels to the canvas Also add a UIView to the view s canvas and connect it to
the volumeView outlet
9 Connect the three labels to the currentTitle, currentArtist, and currentLengthInSeconds
outlets
10 Exit Interface Builder and return to iPodSongsViewController 11 Create a new Objective-C class that is a subclass of NSObject named
MyMediaPickerDelegate and have it adopt the MPMediaPickerControllerDelegate protocol (Listings 18-7 and 18-8) Don t forget to import the MediaPlayer header file
18:
Multimedia
Listing 18-7
MyMediaPickerDelegateh
#import <Foundation/Foundationh> #import <MediaPlayer/MediaPlayerh> @interface MyMediaPickerDelegate : NSObject <MPMediaPickerControllerDelegate> { } @end
Listing 18-8
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