My first iPhone App – Part 2

 Features and Bugs

After showing the app around, I got a lot of input how to improve the concept

  • Instead of the slider show a waveform to make identifying the section easier
  • Set marker for start and end to replay the loop
  • Persist already set markers
  • Mark tracks which already have markers
  • Start and stop playing via Siri
  • When selecting a track which is not on your device at the moment, the app crashes
  • the layout is not suitable for landscape orientation
  • Track time and slider jitter

Fixing Bugs

The concept of iTunes is to show all your music which you’ve ever bought. That means that the assetURL of a media item can be nil. To work around that issue you can intercept the seque transition with

if self.shouldPerformSegue(withIdentifier: "showPlayer", sender: self) {
    self.performSegue(withIdentifier: "showPlayer", sender: self)
    override func shouldPerformSegue(withIdentifier identifier: String, sender: Any?) -> Bool {
        if identifier == "showPlayer"{
            let indexPath = tableView.indexPathForSelectedRow!
            if mediaItems?[indexPath.row].assetURL == nil{
                let alert = UIAlertController(title: "Song is not on your device!", message: "Please download it via music player app", preferredStyle: .alert)
                let cancelAction = UIAlertAction(title: "OK",
                                                 style: .default, handler: nil)
                self.present(alert, animated: true, completion: {
                    print("completion block")
                return false
            return true
        return true

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