AudioServicesPlaySystemSound知道什么时候停止的声音 [英] AudioServicesPlaySystemSound know when sound stopped

问题描述

即时通讯使用

  AudioServicesPlaySystemSound（soundID）;
 

播放声音，但我需要的时候声音停止播放才知道，究竟什么是委托呢？

谢谢！

解决方案

你读过的<一个href=\"http://developer.apple.com/library/ios/#documentation/AudioToolbox/Reference/SystemSoundServicesReference/Reference/reference.html\">documentation?

  

AudioServicesPlaySystemSound

  
  

播放系统声音对象。

 无效AudioServicesPlaySystemSound（
   SystemSoundID inSystemSoundID
）;
 

  

讨论：此功能播放（持续时间30秒或更少）一短声。因为声音可以发挥几秒钟，这
  函数是异步执行的。 要知道在声音
  演奏完毕，叫 AudioServicesAddSystemSoundCompletion
  函数注册一个回调函数

<一个href=\"http://stackoverflow.com/questions/6410143/audioservicesaddsystemsoundcompletion-callback-method-is-not-called-after-a-few\">This计算器的问题可以帮助你学习如何使用此回调。

Im using

AudioServicesPlaySystemSound(soundID);

to play a sound, but I need to know when the sound has stopped playing, so what is the delegate for this?

Thanks!

解决方案

Have you read the documentation?

AudioServicesPlaySystemSound

Plays a system sound object.

void AudioServicesPlaySystemSound (
   SystemSoundID inSystemSoundID
);

Discussion This function plays a short sound (30 seconds or less in duration). Because sound might play for several seconds, this function is executed asynchronously. To know when a sound has finished playing, call the AudioServicesAddSystemSoundCompletion function to register a callback function.

This stackoverflow question might help you to learn how to use this callback.

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