切换到iOS 5后无法播放系统声音

本文介绍了切换到iOS 5后无法播放系统声音的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

这是我在 iOS 4 中播放哔音效果：

This is how I played a beep sound effect in iOS 4:

SystemSoundId beepOnSoundId; CFURLRef soundUrl = CFBundleCopyResourceURL( CFBundleGetMainBundle(), CFSTR("beep"), CFSTR("wav"), NULL ); // soundUrl logged: // file://localhost/var/mobile/Applications/ ... beep.wav AudioServicesCreateSystemSoundID(soundUrl, &beepOnSoundId); // beepOnSoundId logged: 4097 AudioServicesPlaySystemSound(beepOnSoundId);

当我将设备升级到 iOS 5 时，它停止工作。我什么也听不到。

It stopped working, when I upgraded my device to iOS 5. I hear nothing. I logged out all the variables and none were nil or 0.

在 iOS 5 中API的更改如何破坏我的声音播放代码？

How has the API changed in iOS 5 that breaks my sound playing code?

问题可能是因为我有一个 AVCaptureSession 运行时，我播放声音。 iOS 5不知何故不让你这样做。

The problem may be because I have an AVCaptureSession running while I play the sound. iOS 5 somehow doesn't let you do this anymore. I need to play a beep sound while I am recording something from the camera.

推荐答案

此 bug report 可能与您的问题相关，如果您有AVCaptureSession正在运行。

This bug report could be related to your question, if you have an AVCaptureSession running.

在iOS 5下，当使用AudioServicesPlaySystemSound调用时，如果有一个音频设备处于活动状态的AVCaptureSession，将不会工作。

Under iOS 5, when using an AudioServicesPlaySystemSound call, it will not work when there is an active AVCaptureSession with an audio device active.