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I'd like to quickly get a list of artist names in a user's "library" or playlists. Is there an easy / asynchronous way to do this?

devinross
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1 Answers1

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Take a look at the example project "Guess the Intro" included with CocoaLibSpotify. The method waitAndFillTrackPool in that project shows how to get a list of all the tracks in the user's playlists.

Once you have that list, you can do the following to get the artists from them, put them through a set to thin out duplicates, then wait until they're loaded. 

NSArray *artists = [theTrackPool valueForKeyPath:@"@unionOfArrays.artists"];
NSArray *uniqueArtists = [[NSSet setWithArray:artists] allObjects];

[SPAsyncLoading waitUntilLoaded:uniqueArtists then:^(NSArray *loadedArtists) {
    // Artists are loaded!
    // Log a list of artist names...
    NSLog(@"%@", [loadedArtists valueForKey:@"name"]);
}];
iKenndac
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  • I'm noticing in the guess the intro app and when I implement it myself that the initial 'then' block returns only 2 playlists (and 5 tracks). When I close the app and reopen it, the second time around waitAndFillTrackPool gives all 6 playlist and a lot more tracks. Any reason? – devinross May 24 '12 at 06:43
  • Can I get all tracks when using SPAsyncLoading the first time? – devinross May 24 '12 at 06:46
  • Yes - read the documentation to [SPAsyncLoading waitUntilLoaded:timeout:then:]. You need to increase the timeout. – iKenndac May 24 '12 at 07:56