为什么iOS系统声音无法在模拟器中播放? [英] Why doesn't ios system sound play in simulator?

问题描述

我正在尝试播放系统声音.使用Xcode 6 Beta4.这是代码:

I am trying to play a system sound. Using Xcode 6 Beta 4. Here is the code:

func playKeyClick()
{
    let filePath = NSBundle.mainBundle().pathForResource("Tock", ofType: "aiff")
    if NSFileManager.defaultManager().fileExistsAtPath(filePath) {
        println("file exists")
    }
    let fileURL = NSURL(fileURLWithPath: filePath)
    var soundID:SystemSoundID = 0
    AudioServicesCreateSystemSoundID(fileURL, &soundID)
    AudioServicesPlaySystemSound(soundID)
}

它可以在设备上正常运行，但不能在模拟器中播放.我创建了一个测试应用程序，除了播放此声音外什么也不做，所以我认为我没有做任何事情来阻止它.

It works fine on devices but does not play in the simulator. I have created a test app that does nothing but play this sound so I don't think I'm doing anything to stop it.

模拟器可以正常播放Safari应用程序中的声音，因此我认为它可以播放我的应用程序中的声音.

The simulator plays sound from the Safari app ok, so I assume that shows it is capable of playing sound from my app.

请注意，我还有其他代码可以通过两种其他方式播放声音，这些方式也可以在设备上运行，但不能在模拟器上运行.为了简单起见，我选择了此示例.

Note that I also have other code for playing sound in two other ways that also work on devices but not simulator. I chose this example for simplicity.

编辑-将文件更改为资源包以避免混淆

Edit - changed file to resource bundle to avoid confusion

推荐答案

我正在回答自己的问题，以澄清我所学到的东西.有三个问题使我的原始代码无法正常工作.注意，我在模拟器上使用的是Xcode6 Beta4和iphone 5s.

I am answering my own question to clarify what I have learned. There were three issues that prevented my original code from working. Note I'm using Xcode6 Beta4, and iphone 5s on the simulator.

1-我使用的"/System/Library/Audio/UISounds/Tone.caf"原始文件路径在模拟器中不起作用，它仅在设备上有效.通过将音频文件添加到应用程序来更正此问题.

1- The original file path I was using of "/System/Library/Audio/UISounds/Tone.caf" does not work in the simulator, it is only valid on the device. Corrected that by adding audio file to the app.

2- 声音在iPhone Simulator中不起作用?提供了以下信息:声音在ios 7.1及更早版本上正常工作.自从我在使用ios8进行测试时，不确定这些建议中的哪些可行.

2- Sound not working in iPhone Simulator? provided information that got sound working for ios 7.1 and earlier. Not sure which of the several suggestions worked since I was testing with ios8 as I ran through them.

3-因为在ios8上无法使用与ios7相同的代码，所以我假设io8模拟器代码中存在错误(ios8设备可以正常工作).在我尝试产生声音的三种方法中，只有一种无效:

3- Because the same code that works on ios7 doesn't work on ios8, I am assuming there is a bug in the io8 simulator code (ios8 device works OK). Out of three ways I have tried to produce sound, only one doesn't work:

AudioServicesPlaySystemSound()-不起作用

AudioServicesPlaySystemSound() - doesn't work

AudioUnit输出-有效

AudioUnit output - works

AVAudioPlayer-可以工作

AVAudioPlayer - works

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