Swift 5.1 错误：[plugin] AddInstanceForFactory：没有为 id <CFUUID 注册工厂

Question

应用程序崩溃并显示以下错误消息

2019-10-12 20:01:34.332334-0700 Awesome App[26368:3535170] [plugin] AddInstanceForFactory: No factory registered for id <CFUUID 0x600002903280> F8BB1C28-BAE8-11D6-9C31-00039315CD46

崩溃时的断点似乎与 AVAudioPlayer 有关

let path = Bundle.main.path(forResource: "menu_background.mp3", ofType:nil)!
audioPlayer = try AwesomeAudioPlayer(contentsOf: URL(fileURLWithPath: path)) ---> breakpoint

Answer 1

I believe you all might have added the AVFoundation to the frameworks list in Project General Info tab.

Erroneous Code was as follows:

import SwiftUI
import AVFoundation

struct PlayerDetailView: View {
@State private var downloadedFilePath: URL = nil
var audioPlayer: AVAudioPlayer
 
var body: some View {

在我将var audioPlayer: AVAudioPlayer声明移动到行之后，import AVFoundation它似乎正在工作。

因此，以下代码在一个SwiftUI项目中对我有用：

import SwiftUI
import AVFoundation
var audioPlayer: AVAudioPlayer!

struct PlayerDetailView: View {
    @State private var downloadedFilePath: URL = nil

    var body: some View {
        VStack {
            Button("Play the Downloaded Track") {
                if let downloadedPath = self.downloadedFilePath?.path, FileManager().fileExists(atPath: downloadedPath) {
                    do {
                        audioPlayer = try AVAudioPlayer(contentsOf: self.downloadedFilePath!)
                        guard let player = audioPlayer else { return }

                        player.prepareToPlay()
                        player.play()
                    } catch let error {
                        print(error.localizedDescription)
                    }
                } else {
                    print("The file doesn not exist at path || may not have been downloaded yet")
                }
            }
        }
    }
}

我最初是在关注CodeWithChris 的这个教程，它的讨论也导致了上述变化。此外结帐下面的教程太多，如果你需要进一步的例子。

希望这对你们中的某个人有所帮助！

干杯!

Answer 2

我认为这与模拟器设备能够对声音进行排队并播放它之前 AVAudioPlayer 超出范围有关……或者类似的事情。我是 Swift 的新手，对 iOS API 的经验为零。

以下是我在尝试放置后发现的结果：

var player: AVAudioPlayer!

声音将播放或不播放，具体取决于上面线条的位置。

无论如何，我的模拟器设备上总会出现以下错误：

AddInstanceForFactory: No factory registered for id

（我使用的是 2013 年末的 MacBook Pro + MacOS Catalina + Xcode 11.7，并在运行 iOS 13.7 的 iPhone SE 2 模拟器上进行了测试）

尽管错误不断发生，但我很高兴至少可以在模拟器上播放声音......

发生错误并且声音不播放...

import UIKit
import AVFoundation

class ViewController: UIViewController {
    func playTheSound() {
      // initializing the "player" variable within the "playTheSound()" function will cause the "AddInstanceForFactory: No factory registered for id" error and the sound WILL NOT play on the simulator
      var player: AVAudioPlayer! 

      let url = Bundle.main.url(forResource: "funny_sound", withExtension: "mp3")

      player = try! AVAudioPlayer(contentsOf: url!)
      player.play()     
    }
}

发生错误并且播放声音

import UIKit
import AVFoundation

class ViewController: UIViewController {
  // initializing the "player" variable at the class level will still cause the "AddInstanceForFactory: No factory registered for id" error to happen, but the sound will still play on the simulator
  var player: AVAudioPlayer! 

  func playTheSound() {
    let url = Bundle.main.url(forResource: "funny_sound", withExtension: "mp3")

    player = try! AVAudioPlayer(contentsOf: url!)
    player.play()       
  }
}

Answer 3

我相信错误消息是对模拟器的警告，因此它并不重要。

我认为您的问题是代码中的错误。应该是这样的：

let path = Bundle.main.path(forResource: "menu_background", ofType:"mp3") audioPlayer = try AwesomeAudioPlayer(contentsOf: URL(fileURLWithPath: path!)) ---> breakpoint

其中forResource是文件名，ofType是扩展名。你也可以使用Bundle.main.url，它看起来像这样：

let path = Bundle.main.url(forResource: "menu_background", withExtension:"mp3") audioPlayer = try AwesomeAudioPlayer(contentsOf: URL(fileURLWithPath: path!)) ---> breakpoint

Answer 4

我在另一个有关 AVAudioPlayer 的 stackoverflow 线程中找到了解决方案，如下：

如果你初始化你的AVAudioPlayer喜欢

var wrongMusicPlayer: AVAudioPlayer = AVAudioPlayer()或者wrongMusicPlayer = AVAudioPlayer()以任何方法，请删除它并像这样声明var wrongMusicPlayer: AVAudioPlayer！。