如何在 SwiftUI 中等待音频完成？

Posted 2023-02-23

【中文标题】如何在 SwiftUI 中等待音频完成？

【英文标题】：How to wait for the completion of the audio in SwiftUI?

【发布时间】：2020-06-18 17:32:10

【问题描述】：

我只想等到声音结束并调用下一个声音......

这是ConentView struct 中的主要功能，我用处理程序播放声音：

func askNew()

        self.isPlaying = true
        playQuestion 
        //1st audio
            askNew
            //2nd audio to play

                //Change the global @State to see the result
                self.isPlaying = false
            

        

    

播放声音的小功能。显然，它们仅在音频会话开始时才通知我们，而不是等待结束。

// MARK: - Question
func playQuestion(finished: () -> Void) 
   GSAudio.sharedInstance.playSound(sound: "question", type: "mp3", loop: false)
   finished()


func askNewSetCurrent(finished: () -> Void)
   GSAudio.sharedInstance.playSound(sound: "next_sound", type: "mp3", loop: false)
   finished()

【问题讨论】：

***.com/help/minimal-reproducible-example

@Chris 变小了。我想无论如何都会有人要求显示播放器类。

【参考方案1】：

试着这样想

import AVFoundation

class SwiftUIViewModel: NSObject, ObservableObject 
    private var avPlayer: AVAudioPlayer!
    private var arrayOfAllTracks = [Track]()

    // call play track from view
    func playTrack() 
        self.play(track: arrayOfAllTracks[0])
    

    private func play(track: Track) 
        self.avPlayer = try! AVAudioPlayer(contentsOf: track.url, fileTypeHint: AVFileType.mp3.rawValue)

        self.avPlayer?.delegate = self

        avPlayer.play()
    

    private func playNext() 
        let track = self.arrayOfAllTracks[1]
        self.play(track: track)
    


extension SwiftUIViewModel: AVAudioPlayerDelegate 
    func audioPlayerDidFinishPlaying(_ player: AVAudioPlayer, successfully flag: Bool) 
        guard flag else  return 

        self.playNext()
    


struct Track 
    let url: URL!