MyMediaPickerDelegatem in Objective-C

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#import "MyMediaPickerDelegateh" @implementation MyMediaPickerDelegate -(void) mediaPicker: (MPMediaPickerController *) mediaPicker didPickMediaItems: (MPMediaItemCollection *) mediaItemCollection { NSArray * mediaItems = [mediaItemCollection items]; NSEnumerator * enumer = [mediaItems objectEnumerator]; id myObject; while (myObject = [enumer nextObject]) { MPMediaItem * tempMediaItem = (MPMediaItem *) myObject; NSLog(@"Title: %@", [tempMediaItem valueForProperty: MPMediaItemPropertyTitle]); NSLog(@"id: %@", [tempMediaItem valueForProperty:MPMediaItemPropertyArtist]); NSLog(@"id: %i", [tempMediaItem valueForProperty: MPMediaItemPropertyPersistentID]); NSLog(@"-----------------------"); } [mediaPickerparentViewController dismissModalViewControllerAnimated :YES]; [mediaPicker release]; [[NSNotificationCenter defaultCenter] postNotificationName: @"SongsPicked" object: mediaItemCollection]; } -(void) dealloc { [[NSNotificationCenter defaultCenter] removeObserver: self]; [super dealloc]; } @end 12 Open iPodSongsViewController and add properties for the MyMediaPickerDelegate,
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MPMediaLibrary, and MPMusicPlayerController Name the properties mediaPickerDelegate, mediaLib, and player
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13 Add a variable for MPVolumeView named mpVolumeView 14 Be certain that iPodSongsViewController imports MyMediaPickerDelegate, and do not
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15 Return to MyMediaPickerDelegate and implement the didPickMediaItems delegate
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16 Return to iPodSongsViewController and implement the selectSongs and changeState
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17 Implement the viewDidLoad method and the songsPicked method, paying particular
attention to the NSNotification
18 The application runs, displays the controls, and allows selecting multimedia Click Select
Songs, choose a few songs from your iPod and then tap Done The music player starts playing and displays the currently playing item in the labels (Figure 18-3)
Figure 18-3
The application running on an iPod touch
18:
Multimedia
When you think about how long it took us to write this application, it is perhaps the coolest application in the entire book The user interface isn t pretty, but the application works well as a simple music player In fact, with a little polish you might even like it better than the iPod touch s Music application because you can quickly select all the songs you re interested in and then play them In the viewDidLoad method, notice the code for initializing a volume control Although the MPVolumeView class provides a sizeThatFits method, it is better to do it the way presented here Simply add a UIView as a subview, size it to the desired size, and then add the volume view to the subview Easy, and it is guaranteed to size correctly
mpVolumeView = [[MPVolumeView alloc] init]; [mpVolumeView setFrame:[selfvolumeView bounds]]; [selfvolumeView addSubview:mpVolumeView];
As the MPMediaPlayerController does not have a delegate, you made the iPodSongsViewController a listener for the MPMusicPlayerControllerNowPlayingItemDid ChangeNotification event When a player s now-playing item changes, the player fires this event You set the songChanged method as the method called when the event fires After being called, the songChanged method obtains the now-playing item and updates the view s labels The changeState method handles any one of the five control buttons being tapped Because each button has a different tag, the method can distinguish which button fires the Touch Up Inside event and handle the message appropriately In a real-world application, you would disable the buttons as appropriate For instance, when paused, the Pause button should be disabled and only the Play button enabled Here, however, the extra code would have detracted from the example s intended purpose In addition to the player s notification, you created your own notification in MyMediaPickerDelegate Upon selecting an MPMediaItemCollection using the media picker, this notification is fired The songsPicked method in iPodSongsViewController responds to this notification The method takes the NSNotification as a parameter; remember notifications can contain an object Here, that object is the selected MPMediaItemCollection After initializing the media player with the collection, the songsPicked method tells the media player to begin generating playback notifications and then starts playing
MPMoviePlayerController
The MPMoviePlayerController plays video bundled as part of your application It can also stream video from a server However, despite its name, it cannot use video loaded on a user s device by iTunes In versions of iOS prior to 32, MPMoviePlayerController always presents a modal, fullscreen video when it plays and you can only minimally modify its appearance using properties With iOS 32 and later, MPMoviePlayerController can also play video in a portion of the screen or even in portrait orientation This is particularly helpful on the iPad, where the display is large enough to display video in a portion of the screen alongside other information If you want to remain compatible with devices running iOS 31 and earlier, then the player runs full screen and you can change the movie player s background color, a movie s scaling, and the controls presented to the user when playing a movie You change a movie s background color
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