无法使用"AudioFileResource.load(named :)"加载音频；类型方法

问题描述

我可以使用RealityKit的 load(contentsOf:withName:inputMode:loadingStrategy:shouldLoop:)轻松加载 .mp3 和 .aiff 音频文件类型方法.

I can easily load .mp3 and .aiff audio files using RealityKit's load(contentsOf: withName: inputMode: loadingStrategy: shouldLoop:) type method.

static func load(contentsOf url: URL, 
          withName resourceName: String? = nil, 
                      inputMode: AudioResource.InputMode = .spatial, 
                loadingStrategy: AudioFileResource.LoadingStrategy = .preload, 
                     shouldLoop: Bool = false) throws -> AudioFileResource

这是带有 Bundle.main.url()方法的代码:

import RealityKit
import ARKit

class ViewController: UIViewController {

    @IBOutlet var arView: ARView!
    let entity = Entity()
    let anchor = AnchorEntity()
    var audioController: AudioPlaybackController? = nil

    override func viewDidLoad() {
        super.viewDidLoad()
        self.loadAudio()
    }
}

extension ViewController {

    fileprivate func loadAudio() {
        
        let audioURL: URL = Bundle.main.url(forResource: "MonoAudio", 
                                          withExtension: "mp3")!         
        do {
            let audioResource = try AudioFileResource.load(contentsOf: audioURL)
            self.audioController = entity.prepareAudio(audioResource)
            self.audioController?.fade(to: .infinity, duration: 5)
            self.audioController?.speed = 2.0
            self.audioController?.gain = 30
            self.audioController?.play()
        } catch {
            print("Get Error while loading audio file...")
        }
        self.anchor.addChild(entity)
        self.arView.scene.anchors.append(anchor)
    }
}

但是我不能使用 load(命名为:inputMode:loadingStrategy:shouldLoop:)类型方法来加载音频文件.

But I can't load audio file using load(named: in: inputMode: loadingStrategy: shouldLoop:) type method.

static func load(named name: String, 
                  in bundle: Bundle? = nil, 
                  inputMode: AudioResource.InputMode = .spatial, 
            loadingStrategy: AudioFileResource.LoadingStrategy = .preload, 
                 shouldLoop: Bool = false) throws -> AudioFileResource

这是带有 Bundle.main.path()方法的代码:

extension ViewController {
    
    fileprivate func loadAudio() {

        let audioPath: String = Bundle.main.path(forResource: "MonoAudio",
                                                      ofType: "mp3")!
        do {
            let audioResource = try AudioFileResource.load(named: audioPath)
            self.audioController = entity.prepareAudio(audioResource)
            self.audioController?.fade(to: .infinity, duration: 5)
            self.audioController?.speed = 2.0
            self.audioController?.gain = 30
            self.audioController?.play()
        } catch {
            print("Get Error while loading audio file...")
        }
        
        self.anchor.addChild(entity)
        self.arView.scene.anchors.append(anchor)
    }
}

推荐答案

此处无需使用 Bundle.main.path(forResource:ofType:)方法.我需要做的就是为字符串参数 named 分配一个文件名.看起来是这样的:

There's no need to use a Bundle.main.path(forResource:ofType:) method here. All I need to do is to assign a file name to string argument named. Here's how it looks like:

let audioResource = try AudioFileResource.load(named: "MonoAudio.mp3",
                                                  in: nil,
                                           inputMode: .spatial,
                                     loadingStrategy: .preload,
                                          shouldLoop: true)

self.audioController = entity.prepareAudio(audioResource)

self.audioController?.play()

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