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iOS Build a Playlist Browser with Swift Building the Master and Detail Views Displaying Playlist Information

Posted by Kyle DuFrene
Kyle DuFrene
4,217 Points

Found nil when displaying artists

When I run the application and then press the button that will take you to the detail view, the app crashes and returns this error "fatal error: unexpectedly found nil while unwrapping an Optional value". The error occurred at the "playlistArtist0.text = playlist!.artists[0]" line. So I replaced the corresponding outlet, and it worked (even though the outlet I replaced it with was identical. " @IBOutlet weak var playlistCoverImage: UIImageView!" It then worked. Also, before that I commented out the "playlistArtist0.text = playlist!.artists[0]" line and it displaced the other two artists just fine. But, now I am getting that error again, except it is now at "playlistArtist2.text = playlist!.artists[2]". What is going wrong?

My playlistDetailViewController code:

import UIKit

class PlaylistDetailViwControllerViewController: UIViewController {

@IBOutlet weak var buttonPressLabel: UILabel!
var playlist: Playlist?

@IBOutlet weak var playlistCoverImage: UIImageView!
@IBOutlet weak var playlistTitle: UILabel!
@IBOutlet weak var playlistDescription: UILabel!



@IBOutlet weak var playlistArtist0: UILabel!
@IBOutlet weak var playlistArtist1: UILabel!
@IBOutlet weak var playlistArtist2: UILabel!



override func viewDidLoad() {
    super.viewDidLoad()

    if playlist != nil {
        playlistCoverImage.image = playlist!.largeIcon
        playlistCoverImage.backgroundColor = playlist!.backgroungColor
        playlistTitle.text = playlist!.title
        playlistDescription.text = playlist!.description

        playlistArtist0.text = playlist!.artists[0]
        playlistArtist1.text = playlist!.artists[1]
        playlistArtist2.text = playlist!.artists[2]
    }
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

} Thanks, Kyle

3 Answers

Kyle DuFrene
Kyle DuFrene
4,217 Points
Kyle DuFrene
Kyle DuFrene
4,217 Points

I figured it out!

Echo Yang
Echo Yang
6,740 Points

How to solve it? Thks!

Kyle DuFrene
Kyle DuFrene
4,217 Points
Kyle DuFrene
Kyle DuFrene
4,217 Points

Did you have the same problem?

Kyle DuFrene
Kyle DuFrene
4,217 Points
Kyle DuFrene
Kyle DuFrene
4,217 Points

I had just incorrectly linked the artist labels to the code, so I just residing those and it worked.

Echo Yang
Echo Yang
6,740 Points

yes, me too. ^_^