AVAudioPlayer不在Swift播放音频 [英] AVAudioPlayer not playing audio in Swift

问题描述

我有一个非常简单的单一视图中的代码Swift应用程序在我的 ViewController ：

I have this code in a very simple, single view Swift application in my ViewController:

var audioPlayer = AVAudioPlayer()

@IBAction func playMyFile(sender: AnyObject) {

    let fileString = NSBundle.mainBundle().pathForResource("audioFile", ofType: "m4a")
    let url = NSURL(fileURLWithPath: fileString)
    var error : NSError?
    audioPlayer = AVAudioPlayer(contentsOfURL: url, error: &error)
    audioPlayer.delegate = self
    audioPlayer.prepareToPlay()
    if (audioPlayer.isEqual(nil)) {
        println("There was an error: (er)")
    } else {
        audioPlayer.play()
        NSLog("working")
    }

我已添加 import AVFoundation 和 audioPlayer 是一个全局变量。当我执行代码，它打印工作，所以它使通过没有错误，但没有声音播放。

I have added import AVFoundation and audioPlayer is a global variable. When I execute the code, it does print "working", so it makes it through without errors but no sound is played. The device is not in silent.

推荐答案

你的代码有很多错误，Socratic方法崩溃了，它可能是最简单的只是抛出它并显示你：

There's so much wrong with your code that Socratic method breaks down; it will probably be easiest just to throw it out and show you:

var player : AVAudioPlayer! = nil // will be Optional, must supply initializer

@IBAction func playMyFile(sender: AnyObject?) {
    let path = NSBundle.mainBundle().pathForResource("audioFile", ofType:"m4a")
    let fileURL = NSURL(fileURLWithPath: path)
    player = AVAudioPlayer(contentsOfURL: fileURL, error: nil)
    player.prepareToPlay()
    player.delegate = self
    player.play()
}

做任何错误检查，但是如果有问题，上方是你会崩溃。

I have not bothered to do any error checking, but the upside is you'll crash if there's a problem.

一个最后一点，它可能或可能不相关：不是每个 m4a 文件可以播放。例如，高度压缩的文件可能会失败（双关语）。

One final point, which may or may not be relevant: not every m4a file is playable. A highly compressed file, for example, can fail silently (pun intended).

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