firebase - SwiftUI：如何播放下一个音频
问题描述
我正在制作其中包含音频播放器并与 Firebase 连接的应用程序。我不知道如何播放下一首歌。我知道我必须尝试使用 firstIndex 但真的不知道在哪里可以找到答案，所以我在这里问请帮忙。这是代码：
import SwiftUI
import MediaPlayer
import AVFoundation
import FirebaseStorage
let MainColor = Color(#colorLiteral(red: 0.2588235294, green: 0.7411764706,
blue: 0.7764705882, alpha: 1))
let SecondColor = Color(#colorLiteral(red: 0.4470588235, green: 0.7490196078,
blue: 0.2705882353, alpha: 1))
let screenW = UIScreen.main.bounds.width
let screenH = UIScreen.main.bounds.height
struct ZespolView: View {
@State private var showFirst = false
@ObservedObject var bede_zycData : Bede_zycData
var body: some View{
NavigationView{
ScrollView(.horizontal, showsIndicators: false){
HStack(spacing: 10){
NavigationLink(
destination: AlbumCellBedeZyc(image: "bede_zyc_img", name: "Będę żyć, by kochać", artist: "Zespół Filadelfia", numberOfSongs: "11", dateOfRelase: "2008", bede_zycData: bede_zycData),
label: {ZespolCellView(image: "bede_zyc_img", name: "Będę żyć, by kochać", artist: "Zespół Filadelfia", numberOfSongs: "11", dateOfRelase: "2008")}).foregroundColor(.black)
}
}.frame(height: screenW/2.5 + 150)
.navigationTitle("Test view")
}
}
}
struct ZespolCellView : View {
@State var image : String
@State var name : String
@State var artist : String
@State var numberOfSongs : String
@State var dateOfRelase : String
var body: some View{
VStack(alignment: .leading){
Image(image)
.resizable()
.scaledToFit()
.cornerRadius(30)
.shadow(color: Color.black.opacity(0.6), radius: 15)
.frame(width: screenW/2.5, height: screenW/2.5)
Text(name)
.font(.system(size: 15, weight: .bold))
.padding(5)
Text(artist)
.font(.system(size: 14, weight: .thin))
.padding(.horizontal, 5)
}.frame(width: screenW/2.5, height: screenW/2.5 + 150)
.padding(.horizontal)
}
}
struct AlbumCellBedeZyc : View {
@State var image : String
@State var name : String
@State var artist : String
@State var numberOfSongs : String
@State var dateOfRelase : String
@State private var isPresented = false
@ObservedObject var bede_zycData : Bede_zycData
@State private var currentSong : Bede_zycInfo?
@Environment(\.presentationMode) var mode1 : Binding<PresentationMode>
var body: some View{
VStack{
HStack{
Image(image)
.resizable()
.scaledToFit()
.cornerRadius(10)
.shadow(color: Color.black.opacity(0.6), radius: 15)
.frame(width: screenW/2.4, height: screenW/2.4)
Spacer(minLength: 0)
VStack(alignment: .leading, spacing: 5){
HStack{
Text("Album")
.font(.system(size: 15, weight: .thin))
Circle()
.frame(width: 5, height: 5)
Text(numberOfSongs)
.font(.system(size: 15, weight: .thin))
Circle()
.frame(width: 5, height: 5)
Text(dateOfRelase)
.font(.system(size: 15, weight: .thin))
}.foregroundColor(Color.black.opacity(0.5))
Text(name)
.font(.title)
.foregroundColor(.black)
Text(artist)
.foregroundColor(Color.black.opacity(0.5))
.font(.system(size: 19, weight: .thin))
}.frame(width: screenW/2.3)
}.frame(width: screenW - 30)
.padding(.top, 150)
.padding(.horizontal)
HStack(spacing: 18){
Button(action: {
}, label: {
ZStack{
Color.black
VStack{
Image(systemName: "play.circle")
Text("Odtwarzaj")
}.font(.system(size: 18))
.foregroundColor(.white)
}.frame(width: screenW/2.3, height: 50, alignment: .center)
.cornerRadius(10)
.shadow(radius: 15)
}).padding(.leading)
Button(action: {
}, label: {
ZStack{
Color.black.opacity(0.05)
VStack{
Image(systemName: "shuffle")
Text("Lososwo")
}.font(.system(size: 18))
.foregroundColor(.black)
}.frame(width: screenW/2.3, height: 50, alignment: .center)
.cornerRadius(10)
.shadow(radius: 15)
}).padding(.trailing)
}.frame(width: screenW - 30)
.padding(.horizontal)
ScrollView(.vertical, showsIndicators: false){
LazyVStack(alignment: .leading){
ForEach(bede_zycData.bede_zyc, id:\.self){ data in
NavigationLink(destination:
PlayerViewBedeZyc(bede_zycData: data, album: name, image: image, artist: artist)
, label: {
HStack{
Text(data.number)
.foregroundColor(Color.black.opacity(0.9))
.font(.system(size: 20))
.padding(.horizontal)
VStack(alignment: .leading){
Text(data.name)
.foregroundColor(Color.black)
.font(.system(size: 20))
Text(artist)
.foregroundColor(Color.black.opacity(0.5))
.font(.system(size: 18))
}
Spacer()
Text("2:36")
.foregroundColor(Color.black.opacity(0.5))
.font(.system(size: 18))
.padding()
}.padding()
})
}
}.padding(.top)
}
}.padding(.horizontal)
.edgesIgnoringSafeArea(.top)
.navigationBarBackButtonHidden(true)
.navigationBarItems(leading: Button(action: {
self.mode1.wrappedValue.dismiss()
}, label: {
Image(systemName: "chevron.left")
.foregroundColor(.black)
.font(.system(size: 28))
}))
}
}
struct PlayerViewBedeZyc : View {
@Environment(\.presentationMode) var presentationMode1
@State var bede_zycData : Bede_zycInfo
@State var album : String
@State var image : String
@State var artist : String
@State var player = AVPlayer()
@State var isPlaying : Bool = false
var body: some View{
VStack(alignment: .center){
Text(album)
.bold()
.padding(.top, 90)
.padding()
Image(image)
.resizable()
.scaledToFit()
.cornerRadius(10)
.shadow(radius: 20)
.frame(width: screenW/1.3, height: screenW/1.3)
.padding()
Text(bede_zycData.name)
.font(.title)
.bold()
.multilineTextAlignment(.center)
.padding()
Text(artist)
.foregroundColor(Color.black.opacity(0.5))
.font(.system(size: 18))
.padding(.bottom, 50)
HStack(spacing: 20){
Button(action: {
}, label: {
Image(systemName: "shuffle")
}).foregroundColor(Color.black.opacity(0.4))
.font(.system(size: 22))
Button(action: {
}, label: {
Image(systemName: "backward.end")
}).foregroundColor(Color.black)
.font(.system(size: 40))
Button(action: {
}, label: {
Image(systemName: "play.circle")
}).foregroundColor(Color.black)
.font(.system(size: 80))
Button(action: {
playPause()
}, label: {
Image(systemName: "forward.end")
}).foregroundColor(Color.black)
.font(.system(size: 40))
Button(action: {
}, label: {
Image(systemName: "repeat")
}).foregroundColor(Color.black.opacity(0.4))
.font(.system(size: 22))
}
Spacer()
}.onAppear(){
playSong()
}
.edgesIgnoringSafeArea(.top)
.navigationBarBackButtonHidden(true)
.navigationBarItems(leading: Button(action: {
presentationMode1.wrappedValue.dismiss()
}, label: {
Image(systemName: "chevron.left")
.foregroundColor(.black)
.font(.system(size: 28))
}))
}
func playSong(){
let storage = Storage.storage().reference(forURL: self.bede_zycData.url)
storage.downloadURL { (url, error) in
if error != nil {
print(error!)
}else{
do{
try AVAudioSession.sharedInstance().setCategory(AVAudioSession.Category.playback)
try AVAudioSession.sharedInstance().setActive(true)
}catch{
}
player = AVPlayer(playerItem: AVPlayerItem(url: url!))
}
}
}
func playPause(){
self.isPlaying.toggle()
if isPlaying == false{
player.pause()
}else{
player.play()
}
}
func next(){
}
}
这是数据结构：
import SwiftUI
import Firebase
struct Bede_zycInfo : Hashable {
var id = UUID()
var name : String
var number : String
var url : String
}
class Bede_zycData : ObservableObject{
@Published public var bede_zyc = [Bede_zycInfo]()
func loadData(){
Firestore.firestore().collection("Bede_zyc").order(by: "number", descending: false).getDocuments { (snapshot, error) in
if error == nil {
for doc in snapshot!.documents{
let name = doc.data()["name"] as? String ?? "error"
let number = doc.data()["number"] as? String ?? "number"
let url = doc.data()["url"] as? String ?? "error?"
self.bede_zyc.append(Bede_zycInfo(name: name, number: number, url: url))
}
}else{
print(error)
}
}
}
}
和@main代码：
import SwiftUI
import Firebase
@main
struct testApp: App {
let bede_zycdata = Bede_zycData()
init(){
FirebaseApp.configure()
bede_zycdata.loadData()
}
var body: some Scene {
WindowGroup {
ZespolView(bede_zycData: bede_zycdata)
}
}
}
请帮忙！！！
解决方案
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