给定现有路径的 AVAudioPlayer 大量加载音频

Posted 2023-02-25

【中文标题】给定现有路径的 AVAudioPlayer 大量加载音频

【英文标题】：AVAudioPlayer lot loading audio, given existing path

【发布时间】：2017-11-12 04:34:06

【问题描述】：

我正在尝试将要设置的音频加载到 viewDidLoad 函数内的不同按钮。但是，我的应用程序因此错误而崩溃：

线程 1：致命错误：打开包装时意外发现 nil 可选值

override func viewDidLoad() 
    annotateKeys()
    print(constructedArrayOfNotes)


    for key in constructedArrayOfNotes 
        let path = Bundle.main.path(forResource: key, ofType: "mp3")
        do 
            try player = AVAudioPlayer(contentsOf: URL(fileURLWithPath: path!))
            player.prepareToPlay()
            audioPlayers.append(player)
         catch 
            print("error")
        

    

annotate函数构造constructedArrayOfNotes的数组。

音频文件的名称是“PIANO_C3.mp3”。

这是 annotateKeys 函数

func annotateKeys() 
    for index in 0...11 
        constructedArrayOfNotes[index] = "PIANO_" + arrayOfNotes[index] + String(leftSideOfPiano)
    
    for index in 12...23 
        constructedArrayOfNotes[index] = "PIANO_" + arrayOfNotes[index] + String(rightSideOfPiano)
    

这是音频文件的样子：

我不确定我做错了什么，但我猜路径不正确或 Xcode 找不到音频文件。

任何帮助将不胜感激。

这是更多代码：

var audioPlayers = [AVAudioPlayer]()

var player = AVAudioPlayer()




// An array with notes C through B is sequenced twice in order to
// traverse the left and right keyboard.
let arrayOfNotes = ["C", "C#", "D", "D#", "E", "F", "F#", "G", "G#", "A", "A#", "B", "C", "C#", "D", "D#", "E", "F", "F#", "G", "G#", "A", "A#", "B"]

var constructedArrayOfNotes = ["","","","","","","","","","","","","","","","","","","","","","","",""]

【参考方案1】：

那是因为path 在某些时候会为零，这意味着您的密钥设置不正确。用这个替换你的函数

 for key in constructedArrayOfNotes 
        if let path = Bundle.main.path(forResource: key, ofType: "mp3") 
        do 
            try player = AVAudioPlayer(contentsOf: URL(fileURLWithPath: path))
            player.prepareToPlay()
            audioPlayers.append(player)
         catch 
            print("error")
        
      
    

看看哪个键没有弹奏。

【讨论】：

我试过了，但结果是一个空的 audioPlayers 数组。

你的 arrayOfNotes 和 leftSideOfPiano / rightSideOfPiano 是什么

两边是当前钢琴八度

粘贴更多代码并发布这些文件的屏幕截图以查看其名称

很明显路径不正确，这就是为什么你得到一个空的audioPlayers 数组。您是否尝试在追加之前播放每个声音？