How to play MIDI on the iPhone?

Question

As far as I know, there is not native or third party library available to play MIDI on the iPhone. But there seem to be quite a few apps that do exactly that. What are they

Answer 1

This worked for me for playing midi file on iPhone:

import AVFoundation

class MidiPlayer: NSObject {
    static let shared = MidiPlayer()
    var musicPlayer: MusicPlayer?
    var sequence: MusicSequence?

    func play(file: String) {
        guard let midiFile = Bundle.main.url(forResource: file, withExtension: "mid") else {
            return
        }

        NewMusicPlayer(&musicPlayer)
        NewMusicSequence(&sequence)

        if let musicPlayer = musicPlayer, let sequence = sequence {
            MusicSequenceFileLoad(sequence, midiFile as CFURL, .midiType, MusicSequenceLoadFlags())
            MusicPlayerSetSequence(musicPlayer, sequence)
            MusicPlayerStart(musicPlayer)
        }
    }

    func stop() {
        if let musicPlayer = musicPlayer {
            MusicPlayerStop(musicPlayer)
        }
    }
}

and then MidiPlayer.shared.play(file: "midifile")