SWiftUI example

ContentView.swift

//
//  ContentView.swift
//

import AVFoundation
import SwiftUI

struct Track: Identifiable {
    var id = UUID()
    var title: String
}

let playlist: [Track] = [
    Track(title: "Song 1"),
    Track(title: "Song 2"),
    Track(title: "Song 3"),
]

struct ContentView: View {

    @State private var playlistIndex = 0
    

    var body: some View {
        VStack {
            HStack {
                Text("playlistIndex: \(self.playlistIndex)")
            }
            VStack {
                ForEach(0..<playlist.count) {
                    if $0 == self.playlistIndex {
                        Text("🔈 \(playlist[$0].title)")
                    } else {
                        Text(playlist[$0].title)
                    }
                }
            }.padding()
            HStack {
                Text("⏮").onTapGesture {
                    if self.playlistIndex == 0 {
                        self.playlistIndex = playlist.count - 1
                    } else {
                        self.playlistIndex = self.playlistIndex - 1
                    }
                }
                Text("⏭").onTapGesture {
                    if self.playlistIndex == playlist.count - 1 {
                        self.playlistIndex = 0
                    } else {
                        self.playlistIndex = self.playlistIndex + 1
                    }
                }
            }
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}