I want to transfer my Radio Dorfdepp App in NodeJS to an iOS App written in Swift5

Just made up a small "Radio Player" (more just a playlist Player with only one Play Button) for some friends of mine in pure HTML 5, CSS3 and JavaScript and Node JS. Now I want to change the JS Code Logic into a Swift 5 to have all that as an iOS App. If you go on the page radiodorfdepp.de you first have to pass the age verification, next you can just click one button which changes the picture and plays randomly songs from an array of mp3 files. This works fine on an ordinary desktop browser and on androids, but not on iOS. There the screen dimms a bit down after the click and nothing gets played. My main question is: how can I make a button in swift 5 which plays the click sound, starts a random song from the playlist, plays the songs, which are saved in an array, continuously and randomly on and on..And, what is one of the most crucial points: does not turns the iOS Gadget into this strange dimming mode ? Is there anybody out there who hast the nerves and skills to tell me how to "swiftify" my JS Code into a an Swift5 Code?

I hope to hear from you ! Here is my git: https://github.com/StPercy/RadioDorfdepp And here is my JavaScript Code:

You'll probably want to drop a cookie so this doesn't pop up everytime. I'd reccomend this plugin:
https://github.com/js-cookie/js-cookie
*/

overAge = function() {
  $('#age-verify').addClass('hidden');
}

underAge = function() {
  $('#age-verify').addClass('under');
}

goBack = function() {
  window.location.replace(document.referrer);    //better use this for this single page app...
  // window.history.back(); //works only for sites with severeal pages
}


// The Stuff to make the button NotDBLClickable, but ON(C)E-Clickable:

     const once = f => {
      let finished = false;
      return (...args) => {
        if (!finished) {
          finished = true;
          f(...args);
        }
      };
    };

    const bgimage_on = document.getElementById("bgimage_on");
      bgimage_on.addEventListener('click', once(toDo).bind(this));




//The Doing of all the Crap, two functions inside to change the pic and to play all the random selected Dorfdeppen-mp3s:

function toDo(){  


changePicture(); 
setTimeout(selectRandom, 3000); 

// let freezeClic = false; // just modify that variable to disable all clics events

// document.addEventListener("click", e => {
//     if (freezeClic) {
//         e.stopPropagation();
//         e.preventDefault();
//     }
// }, true);

  }

  
// Play Click
  function playClick() {

    const Clicksound = new Audio('./sounds/clickKurz.mp3');
    Clicksound.play();
    
    }


  //The stuff to change the pics

  var xchange = true;
  
  function changePicture() {
    var current = document.getElementById("bgimage_on");
    if(xchange) {
      current.src = "bilder/Radio_01.jpg"
      xchange = false;
    } else {
      current.src = "bilder/Radio_02.jpg"
      xchange = true;
    }
   
  }

//The stuff to change the audiofiles and play them

var lastSong = null;
var selection = null;

var playlist = ["sounds/derRussischeWeg.mp3","sounds/longIslandIcetea.mp3","sounds/liveImHaus.mp3","sounds/liquidTrip.mp3",
"sounds/lightinASpliff.mp3","sounds/liegeAusMetall.mp3","sounds/liberoDerLibido.mp3","sounds/lauchLsd.mp3",
"sounds/lappenfreunde.mp3","sounds/Kuhdorfdepp.mp3","sounds/krawallImAll.mp3","sounds/knecht.mp3",
"sounds/kleineMaedchen.mp3","sounds/killerOfRhymes.mp3","sounds/Kevin.mp3","sounds/jurassicPark.mp3",
"sounds/jogging.mp3","sounds/jingleRmxZwei.mp3","sounds/jingleRmx.mp3","sounds/inYourHeart.mp3",
"sounds/Ikea.mp3","sounds/ichWillSaufen.mp3","sounds/iCantDance.mp3","sounds/hotBodies.mp3",
"sounds/holidaysInTheRain.mp3","sounds/hiCarb.mp3","sounds/heisseMilfMitHonig.mp3","sounds/hartgeldBitch.mp3",
"sounds/Harburg.mp3","sounds/handumdrehen.mp3","sounds/Hampelmann.mp3","sounds/Hagenbeck.mp3",
"sounds/Grabschänder.mp3","sounds/goldenSpoon.mp3","sounds/getSloty.mp3","sounds/gelbePillen.mp3",
"sounds/geburtAusDeimRektum.mp3","sounds/Fusion.mp3","sounds/funkySchiss.mp3","sounds/fuckPussy.mp3",
"sounds/flickenKassieren.mp3","sounds/fleischwurstEinhorn.MP3",
"sounds/Fleisch.mp3","sounds/Fireheart.mp3","sounds/fassInDieTuete.mp3","sounds/einsZweiDreiAhh.mp3",
"sounds/einGanzNormalesRddLied.mp3","sounds/ehrlicherErwin.mp3","sounds/durchbrenn.mp3",
"sounds/duBistNackt.mp3","sounds/dreiZuNull.mp3","sounds/doubleFuck.mp3","sounds/dorfdeppJingle.mp3",
"sounds/dorfdeppAnthem.MP3","sounds/dontStop.mp3","sounds/Discoland.mp3","sounds/dieZeit.mp3",
"sounds/dieTiere.mp3","sounds/diesDas.mp3","sounds/diddlzInnaCypher.mp3","sounds/diddlalarm.mp3",
"sounds/derTrueffelo.mp3","sounds/deinVaterRdd.mp3","sounds/deinVaterHat.mp3","sounds/deinSchwager.mp3",
"sounds/deinRadio.mp3","sounds/deinArsch.mp3","sounds/dasLebenIsSchwer.mp3","sounds/dasIsDeutschland.mp3",
"sounds/dankeMerkel.mp3","sounds/daFotz.mp3","sounds/Crewlove.mp3","sounds/ccb.mp3","sounds/buggiMedley.mp3",
"sounds/bToBSuplex.mp3","sounds/brilleUndDuttRmx.mp3","sounds/blockDieFrequenz.mp3","sounds/Bettgestell.MP3",
"sounds/berlinPartyCop.mp3","sounds/beissDenGagball.mp3","sounds/beefOderPeace.mp3","sounds/Beachdepp.mp3",
"sounds/babyImBauch.mp3","sounds/allesIsVorbei.mp3","sounds/alleAufIhnRauf.MP3","sounds/alkUndGewalt.mp3",
"sounds/again.mp3","sounds/afterhour.MP3","sounds/aerobic.mp3"  ]; // List of songs

var player = document.getElementById("audioplayer"); // Get audio element

player.autoplay = 0;
player.addEventListener("ended", selectRandom); // Run function when the song ends



function selectRandom(){
    while(selection == lastSong){ // Repeat until a different song is selected
        selection = Math.floor(Math.random() * playlist.length);
    }
    lastSong = selection; // Remember the last song
    player.src = playlist[selection]; // Tell HTML the location of the new song
    player.play();
    
}

selectRandom(); // Select initial song
player.pause();


// the fade in of the mp3:

$(document).ready(function(){
  $("#audioplayer")[0].volume = 0;
  $("#audioplayer").animate({volume: 1}, 10000);
});```