bunnyshell bunnyshell - 1 year ago 160
Swift Question

How to get artwork from MPMediaItemCollection

My goal is to get the cover picture for the playlists in iPod library. And I did something like

playlistMediaItemCollections = MPMediaQuery.playlistsQuery().collections ?? []
let artworks = playlistMediaItemCollections.map { $0.valueForKey(MPMediaItemPropertyArtwork) as? MPMediaItemArtwork }

But it results in error

Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<MPConcreteMediaPlaylist 0x1468b1eb0> valueForUndefinedKey:]: this class is not key value coding-compliant for the key artwork.'

Anyone knows how I can get the playlist artwork? Thanks

Answer Source

You should use valueForProperty instead:

$0.valueForProperty(MPMediaItemPropertyArtwork) as? MPMediaItemArtwork

However, I think unlike songs or albums, MediaPlayer API does not provide such property key that lets you retrieve the artwork of a playlist. You can check out possible ones that can be used with MPMediaPlaylist class:

let MPMediaPlaylistPropertyPersistentID: String
let MPMediaPlaylistPropertyName: String
let MPMediaPlaylistPropertyPlaylistAttributes: String
let MPMediaPlaylistPropertySeedItems: String

One alternative is, you can get artworks of songs in the playlist, and show either one of them or combine them to create a new artwork for the playlist.

I think Music app does the same thing like below if a playlist doesn't have an artwork image.

enter image description here

let playlist = MPMediaQuery.playlistsQuery().collections?.first
let artworks = playlist?.items.map { $0.valueForProperty(MPMediaItemPropertyArtwork) as? MPMediaItemArtwork }
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