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MPMediaItem and MPMediaItemCollection
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An MPMediaItem encapsulates a single audio multimedia element in a device s iTunes multimedia collection The MPMediaItem contains one method for obtaining a media item s properties, the valueForProperty: method
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-(id)valueForProperty:(NSString *)property
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The valueForProperty: method takes a constant representing the property for which to obtain a value Notice that the method returns an id; this means the function s return value is tied to the property constant passed to the method Listing 18-3 lists the properties you might pass to the valueForProperty: method Listing 18-3
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NSString NSString NSString NSString NSString NSString NSString NSString
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Media Item properties
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MPMediaItemPropertyPersistentID; MPMediaItemPropertyAlbumTrackNumber; MPMediaItemPropertyAlbumTrackCount; MPMediaItemPropertyDiscNumber; MPMediaItemPropertyDiscCount; MPMediaItemPropertyArtwork; MPMediaItemPropertyLyrics; MPMediaItemPropertyPodcastTitle;
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You can also use user-defined properties These properties have a variable value, depending upon a user s multimedia collection use Listing 18-4 lists the user-defined properties Listing 18-4
NSString NSString NSString NSString
User-defined properties
MPMediaItemPropertyPlayCount; MPMediaItemPropertySkipCount; MPMediaItemPropertyRating; MPMediaItemPropertyLastPlayedDate;
*const *const *const *const
The MPMediaItemCollection class is a collection of media items You obtain a collection s media items through its items property This property returns an NSArray of MPMediaItem objects Other properties include count, mediaTypes, and the representativeItem properties The count property returns a count of the collection s multimedia items as an NSUInteger You use the mediaTypes property and the representativeItem property to obtain a collection s media types
Selecting Multimedia
Before playing multimedia, a user must select the media items The easiest way to allow a user to do this is through the MPMediaPickerController Similar to the UIImagePickerController, it controls a view that is hidden from developers Also, like the image picker, it enables you to define a delegate for the media picker That delegate, the MPMediaPickerControllerDelegate, responds to a user s interaction with the media picker
iOS SDK Programming: A Beginner s Guide
MPMediaPickerController
The MPMediaPickerController class manages the media picker view As with the UIImagePickerController, you present this controller s view as a modal view that overlays the currently displaying view
[self presentModalViewController:mediaController animated:YES];
You can initialize a media picker to only display certain media types using the initWithMediaTypes method This method takes an MPMediaType; valid types are MPMediaTypeMusic, MPMediaTypePodcast, MPMediaTypeAudioBook, and MPMediaTypeAnyAudio Notice there is no MPMediaTypeVideo; you cannot select or play an iTunes-loaded video on devices using MPMediaPickerController (Note that iPhone 3gs and later devices are capable of selecting video using the UIImagePickerController) You can also initialize a media picker to allow a user to select multiple items by setting the allowsPickingMultipletems property to YES If you don t set this property, its default value is NO
MPMediaPickerControllerDelegate
A media picker requires an MPMediaPickerControllerDelegate if it is to do anything interesting An MPMediaPickerControllerDelegate has two methods you implement when adopting this protocol: the mediaPicker:didPickMediaItems: and mediaPickerDidCancel: methods
(void) mediaPicker: (MPMediaPickerController *)mediaPicker didPickMediaItems: (MPMediaItemCollection *) mediaItemCollection (void) mediaPickerDidCancel: (MPMediaPickerController *) mediaPicker
The mediaPickerDidCancel: method responds to a user canceling the media picker, while the mediaPicker:didPickMediaItems: method responds to a user clicking the Done button after selecting media in the media picker
Playing Multimedia: MPMusicPlayerController
A user will probably want to play a multimedia object after selecting it You play an MPMediaItemsCollection using the MPMusicPlayerController This class is responsible for playing audio media items There are two player types to choose from: an iPodMusicPlayer and an applicationMusicPlayer An iPodMusicPlayer replaces an iPod s state, while an applicationMusicPlayer is independent of a user s iPod For instance, if you are using iPodMusicPlayer and set it to shuffle mode, the user s iPod application will be in shuffle mode the next time he or she uses it When using the applicationMusicPlayer, this does not happen because it does not modify the iPod s state You initialize a music player s media collection using the setQueueWithQuery:, setQueueWithItems:, or setQueueWithItemCollection: method The set with query method takes an MPMediaQuery, the set with items method takes an NSArray of MPMediaItems, and the set with collection method takes an MPMediaItemCollection
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