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iOS Build a Playlist Browser with Swift Refactoring Our Code Wrapping Up!

When I compile the project I downloaded from the teacher notes, I receive a compile error.

In the file playlist.swift Xcode ask me to do some modifications for the code to run.

the modified code: init(index: Int) { let musicLibrary = MusicLibrary().library let playlistDictionary = musicLibrary[index]

    title = playlistDictionary["title"] as! String!
    description = playlistDictionary["description"]as! String!

    let iconName = playlistDictionary["icon"]as! String!
    icon = UIImage(named: iconName)

    let largeIconName = playlistDictionary["largeIcon"]as! String!
    largeIcon = UIImage(named: largeIconName)

    artists += playlistDictionary["artists"] as! [String]

    let colorsDictionary = playlistDictionary["backgroundColor"] as! [String:CGFloat]
    backgroundColor = rgbColorFromDictionary(colorsDictionary)

see the 'as' had to be unwrapped for the project to compile and run. Why?

Since Pasan made the video, Apple have updated Swift to make it safer. see https://developer.apple.com/swift/blog/?id=23.