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

Piotr Reshetin
Piotr Reshetin
1,815 Points
Posted by Piotr Reshetin
Piotr Reshetin
1,815 Points

New feature: a mutable ordered list of playlist artists

Just want to share my feature.

Currently each playlist contains list of artists of the same size. But in case of different number of artists the existing code will throw a runtime error on navigating of playlist.

Ok, here is my sollution.

At PlaylistDetailViewController.swift add:

var artists: [UILabel?] = []

Then inside viewDidLoad() function add: 

artists = [
                playlistArtist0,
                playlistArtist1,
                playlistArtist2,
                playlistArtist3,
                playlistArtist4,
                playlistArtist5,
                playlistArtist6
            ]
let numberOfArtists = artists.count

for index in 0..<numberOfArtists {
    if index < playlist!.artists?.count {
        artists[index]!.text = "\(index + 1). \((playlist!.artists?[index])!)"
    } else {
        artists[index]!.text = ""
    }
}

That's it! To check everything is working fine, go to MusicLibrary.swift and at any playlist remove a few artists. And then run your app and tap to that playlist.

Hope this helps someone!

1 Answer

Caleb Kleveter
MOD
Caleb Kleveter
Treehouse Moderator 37,862 Points
Caleb Kleveter
Caleb Kleveter
Treehouse Moderator 37,862 Points

Great job Piotr! Great to see somebody putting what they know into practice!