在iPhone上设置设备音量 [英] Set device volume on iPhone

问题描述

我正在编写一个使用 AVAudioPlayers 来播放声音的应用，我需要以绝对MAX音量播放声音。是的，您可以设置 AVAudioPlayer 的相对音量，但如果用户关闭了设备音量，声音仍会静音播放。

I'm writing an app that uses AVAudioPlayers to play sounds and I need the sounds to play at absolute MAX volume. Yes you can set the relative volume for an AVAudioPlayer, but if the user has the device volume turned down, the sound will still play quietly.

我知道Apple说设备音量无法被覆盖，但闹钟应用程序在某种程度上可以做到这一点 - 所以必须有办法。

I know that Apple says that the device volume cannot be overridden, but yet the Alarm Clock apps out there somehow are able to do this - so there must be a way.

我相信这可以通过使用调用的音频队列来完成：

I believe that this can be done using Audio Queues using the call:

AudioQueueSetParameter(aq, kAudioQueueParam_Volume, 1.0);

但是我的代码需要使用 AVAudioPlayer 播放声音，所以我不认为这种方法会有任何帮助。

But my code needs to use the AVAudioPlayer to play the sounds so I don't think this approach will be of any help.

还有一种方法可以使用的无证件功能MPVolumeView 来实现这一目标，但显然有人因使用此方法而拒绝了应用程序。

There is also a way to use an undocumented function of MPVolumeView to accomplish this, but apparently someone already had an app rejected for using this method.

还有其他想法吗？

推荐答案

匿名对此网站的评论：

float volume;
[[MPMusicPlayerController applicationMusicPlayer] setVolume:volume];

确实有效。

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