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Number of albums by artist

What is my question =)

MPMediaQuery *artistQuery = [MPMediaQuery artistsQuery];
NSArray *songsByArtist = [artistQuery collections];

How can I get the number of albums of each artist MPMediaItemCollections in songByArtist?

Example:

The Beatles 3 Albums

AC / DC 6 Albums

Thank!

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6 answers

Convenience Designer artistsQuerydoes not sort or group by album. artistsQueryreturns an array of collections of multimedia elements of all artists sorted alphabetically by artist name. Nested inside each collection, the artist is an array of multimedia elements associated with all the songs for this artist. The nested array is sorted alphabetically by song name.

- NSMutableSet , . NSMutableDictionary. , NSMutableSet :

MPMediaQuery *artistQuery = [MPMediaQuery artistsQuery];
NSArray *songsByArtist = [artistQuery collections];
NSMutableDictionary *artistDictionary = [NSMutableDictionary dictionary];
NSMutableSet *tempSet = [NSMutableSet set];

[songsByArtist enumerateObjectsUsingBlock:^(MPMediaItemCollection *artistCollection, NSUInteger idx, BOOL *stop) {
    NSString *artistName = [[artistCollection representativeItem] valueForProperty:MPMediaItemPropertyArtist];

    [[artistCollection items] enumerateObjectsUsingBlock:^(MPMediaItem *songItem, NSUInteger idx, BOOL *stop) {
        NSString *albumName = [songItem valueForProperty:MPMediaItemPropertyAlbumTitle];
        [tempSet addObject:albumName];
    }];
    [artistDictionary setValue:[NSNumber numberWithUnsignedInteger:[tempSet count]] 
                        forKey:artistName];
    [tempSet removeAllObjects];
}];
NSLog(@"Artist Album Count Dictionary: %@", artistDictionary);

, albumsQuery. . NSCountedSet. :

MPMediaQuery *albumQuery = [MPMediaQuery albumsQuery];
NSArray *albumCollection = [albumQuery collections];
NSCountedSet *artistAlbumCounter = [NSCountedSet set];

[albumCollection enumerateObjectsUsingBlock:^(MPMediaItemCollection *album, NSUInteger idx, BOOL *stop) {
    NSString *artistName = [[album representativeItem] valueForProperty:MPMediaItemPropertyArtist];
    [artistAlbumCounter addObject:artistName];
}];
NSLog(@"Artist Album Counted Set: %@", artistAlbumCounter);

NSCountedSet countForObject:.

+5

:

MPMediaPropertyPredicate *artistNamePredicate = [MPMediaPropertyPredicate predicateWithValue:@"ArtistName" forProperty:MPMediaItemPropertyArtist];
MPMediaQuery *myComplexQuery = [[MPMediaQuery alloc] init];
[myComplexQuery addFilterPredicate: artistNamePredicate];
NSInteger songCount = [[myComplexQuery collections] count]; //number of songs
myComplexQuery.groupingType = MPMediaGroupingAlbum;
NSInteger albumCount = [[myComplexQuery collections] count]; //number of albums
+5

2 :

var artistQuery = MPMediaQuery.artistsQuery()
var artistQuery.groupingType = MPMediaGrouping.AlbumArtist
var songsByArtist = artistQuery.collections
var artistDictionary = NSMutableDictionary()
var tempSet = NSMutableSet()

songsByArtist.enumerateObjectsUsingBlock { (artistCollection, idx, stop) -> Void in
     let collection = artistCollection as! MPMediaItemCollection
     let rowItem = collection.representativeItem

     let artistName = rowItem?.valueForProperty(MPMediaItemPropertyAlbumArtist)

     let collectionContent:NSArray = collection.items

     collectionContent.enumerateObjectsUsingBlock { (songItem, idx, stop) -> Void in
          let item = songItem as! MPMediaItem

          let albumName = item.valueForProperty(MPMediaItemPropertyAlbumTitle)
          self.tempSet.addObject(albumName!)
     }

     self.artistDictionary.setValue(NSNumber(unsignedInteger: self.tempSet.count), forKey: artistName! as! String)
     self.tempSet.removeAllObjects()
}
print("Album Count Dictionary: \(artistDictionary)")
+1

E, , , .

    let artistQuery = MPMediaQuery.artistsQuery()
    artistQuery.groupingType = MPMediaGrouping.AlbumArtist

    let songsByArtist = artistQuery.collections! as NSArray
    let artistDictionary = NSMutableDictionary()
    let tempSet = NSMutableSet()

    songsByArtist.enumerateObjectsUsingBlock( { (artistCollection, idx, stop) -> Void in
        let collection = artistCollection as! MPMediaItemCollection
        let rowItem = collection.representativeItem

        let artistName = rowItem?.valueForProperty(MPMediaItemPropertyAlbumArtist)

        let collectionContent:NSArray = collection.items

        collectionContent.enumerateObjectsUsingBlock({ (songItem, idx, stop) -> Void in
            let item = songItem as! MPMediaItem

            let albumName = item.valueForProperty(MPMediaItemPropertyAlbumTitle)
            tempSet.addObject(albumName!)
        })

        artistDictionary.setValue(NSNumber(unsignedInteger: UInt(tempSet.count)), forKey: artistName! as! String)
        tempSet.removeAllObjects()
    })

    print("Album Count Dictionary: \(artistDictionary)")
0

.

, - .

.

    /// Get all artists and their songs
///
func getAllArtists() {
    let query: MPMediaQuery = MPMediaQuery.artists()
    query.groupingType = .albumArtist

    let artistsColelctions = query.collections

    artists.removeAll()


    var tempSet = NSMutableSet()



    guard artistsColelctions != nil else {
        return
    }

    // 1. Create Artist Objects from collection

    for collection in artistsColelctions! {
        let item: MPMediaItem? = collection.representativeItem

        var artistName = item?.value(forKey: MPMediaItemPropertyArtist) as? String ?? "<Unknown>"
        artistName = artistName.trimmingCharacters(in: NSCharacterSet.whitespacesAndNewlines)
        let artistId = item!.value(forProperty: MPMediaItemPropertyArtistPersistentID) as! NSNumber


        // temp
        let albumName = item?.albumTitle
        let albumID  = item?.albumPersistentID

        print(albumName)
        print(albumID)



        // Create artist item

        let artist = Artist()
        artist.name = artistName
        artist.artworkTitle = String(artistName.characters.prefix(1)).uppercased()
        artist.artistId = String(describing: artistId)


        // 2. Get Albums for respective Artist object
        //--------------------------------------------

        let mediaQuery2 = MPMediaQuery.albums()
        let predicate2 = MPMediaPropertyPredicate.init(value: artistId, forProperty: MPMediaItemPropertyArtistPersistentID)
        mediaQuery2.addFilterPredicate(predicate2)

        let albums = mediaQuery2.collections

        for collection in albums! {
            let item: MPMediaItem? = collection.representativeItem

            let albumName = item?.value(forKey: MPMediaItemPropertyAlbumTitle) as? String ?? "<Unknown>"
            let albumId = item!.value(forProperty: MPMediaItemPropertyAlbumPersistentID) as! NSNumber
            let artistName = item?.value(forKey: MPMediaItemPropertyAlbumArtist) as? String ?? "unknown"

            let genreName = item?.genre ?? ""

            let year = item?.releaseDate ?? item?.dateAdded

            let dateAdded = item?.dateAdded

            // Create album object

            let album = Album()
            album.name = albumName
            album.artistName = artistName
            album.genre = genreName
            album.releaseDate = year
            album.dateAdded = dateAdded
            album.albumId = String(describing: albumId)

            // Add artwork to album object
            let artwork = Artwork.init(forAlbum: item)
            album.artwork = artwork


            // 3. Get Songs inside the resepctive Album object
            //---------------------------------------------------

            let mediaQuery = MPMediaQuery.songs()
            let predicate = MPMediaPropertyPredicate.init(value: albumId, forProperty: MPMediaItemPropertyAlbumPersistentID)
            mediaQuery.addFilterPredicate(predicate)
            let song = mediaQuery.items

            if let allSongs = song {
                var index = 0

                for item in allSongs {
                    let pathURL: URL? = item.value(forProperty: MPMediaItemPropertyAssetURL) as? URL
                    let isCloud = item.value(forProperty: MPMediaItemPropertyIsCloudItem) as! Bool

                    let trackInfo = TrackInfo()
                    trackInfo.index = index
                    trackInfo.mediaItem = item
                    trackInfo.isCloudItem = isCloud

                    trackInfo.isExplicitItem = item.isExplicitItem

                    trackInfo.isSelected = false
                    trackInfo.songURL = pathURL
                    album.songs?.append(trackInfo)
                    index += 1
                }
            }


            artist.albums?.append(album)

        }

        // Finally add the artist object to Artists Array
        artists.append(artist)

        }


    }
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