SMetadata.swift

//
//  SMetadata.swift
//  SimpleMusic
//
//  Created by Atharva Vaidya on 09/08/15.
//  Copyright (c) 2015 Atharva Vaidya. All rights reserved.
//

import Cocoa
import AVFoundation

class SMetadata: AVMetadataItem
{
    var title: String!
    var artist: String!
    var album: String!
    
    func metaDataForAVAsset(asset: AVAsset) -> [String:String]
    {
        //Updated code thanks to the fork from istx25 on GitHub
        
        var metadata = ["title": "", "artist": "", "albums": ""]
        
        let metaTitle = AVMetadataItem.metadataItemsFromArray(asset.commonMetadata, withKey: AVMetadataCommonKeyTitle, keySpace: AVMetadataKeySpaceCommon)
        let titles = metaTitle.first! as! AVMetadataItem
        
        title = "\(titles.value())"
        metadata["title"] = title
        
        let metaArtist = AVMetadataItem.metadataItemsFromArray(asset.commonMetadata, withKey: AVMetadataCommonKeyArtist, keySpace: AVMetadataKeySpaceCommon)
        let artists = metaArtist.first! as! AVMetadataItem
        
        artist = "\(artists.value())"
        metadata["artist"] = artist
        
        let metaAlbum = AVMetadataItem.metadataItemsFromArray(asset.commonMetadata, withKey: AVMetadataCommonKeyAlbumName, keySpace: AVMetadataKeySpaceCommon)
        let albums = metaAlbum.first! as! AVMetadataItem
        
        album = "\(albums.value())"
        metadata["album"] = album
        
        return metadata
    }
}

Thanks a lot for the advice, I'm still a beginner.

The strange thing is I already knew points 1 and 3, but for some reason my brain didn't think to write the code in that way. Oh well, now I'll remember to do those things because they'll stick in my memory.