2010-01-17 1 views

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Querying the media library ...

MPMediaQuery *query = [[MPMediaQuery alloc] init]; 

[query addFilterPredicate: [MPMediaPropertyPredicate 
           predicateWithValue: @"Moribund the Squirrel" 
             forProperty: MPMediaItemPropertyArtist]]; 
// Sets the grouping type for the media query 
[query setGroupingType: MPMediaGroupingAlbum]; 

NSArray *albums = [query collections]; 
for (MPMediaItemCollection *album in albums) { 
    MPMediaItem *representativeItem = [album representativeItem]; 
    NSString *artistName = 
     [representativeItem valueForProperty: MPMediaItemPropertyArtist]; 
    NSString *albumName = 
     [representativeItem valueForProperty: MPMediaItemPropertyAlbumTitle]; 
    NSLog (@"%@ by %@", albumName, artistName); 

    NSArray *songs = [album items]; 
    for (MPMediaItem *song in songs) { 
     NSString *songTitle = 
      [song valueForProperty: MPMediaItemPropertyTitle]; 
     NSLog (@"\t\t%@", songTitle); 
    } 
} 

System Constants ...

NSString *const MPMediaItemPropertyPersistentID;  // filterable 
NSString *const MPMediaItemPropertyMediaType;   // filterable 
NSString *const MPMediaItemPropertyTitle;    // filterable 
NSString *const MPMediaItemPropertyAlbumTitle;  // filterable 
NSString *const MPMediaItemPropertyArtist;   // filterable 
NSString *const MPMediaItemPropertyAlbumArtist;  // filterable 
NSString *const MPMediaItemPropertyGenre;    // filterable 
NSString *const MPMediaItemPropertyComposer;   // filterable 
NSString *const MPMediaItemPropertyPlaybackDuration; 
NSString *const MPMediaItemPropertyAlbumTrackNumber; 
NSString *const MPMediaItemPropertyAlbumTrackCount; 
NSString *const MPMediaItemPropertyDiscNumber; 
NSString *const MPMediaItemPropertyDiscCount; 
NSString *const MPMediaItemPropertyArtwork; 
NSString *const MPMediaItemPropertyLyrics; 
NSString *const MPMediaItemPropertyIsCompilation;  // filterable 

NSString *const MPMediaItemPropertyPodcastTitle;  // filterable 

NSString *const MPMediaItemPropertyPlayCount; 
NSString *const MPMediaItemPropertySkipCount; 
NSString *const MPMediaItemPropertyRating; 
NSString *const MPMediaItemPropertyLastPlayedDate; 
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