blocks|key|274458|text|在3.1中，有两种协议支持将音频输出到蓝牙设备，并且使用取决于附件。第一种是A2DP，它与支持接收立体声音乐的歌曲一起使用，另一种是对所有的免费音乐免费使用。要激活第一个选项，您需要使用具有音量滑块和音频设备选择按钮的MPVolumeView类，当该视图添加到应用程序中的任何视图时，它为用户提供了一种方法来设置音量，如果连接(这是我找到的唯一方法)，则可以使用调用激活第二个选项。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|274459|+UInt32+bt+=+TRUE;
+result+=+AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryEnableBluetoothInput+,+sizeof(UInt32),+&bt);|code-block|syntax|javascript|274460|应用程序必须初始化音频会话并使用corect存储库(它必须支持对音频会话进行重新编码才能工作)。设置EnableBluetoothInput后，所有输入和输出音频将通过免费设备进行路由(当然，如果连接到:)|274461|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

In 3.1 there are two protocols that support outputting audio to bluetooth devices and the use depends on the accessory. The first is A2DP which is used with accessores that support recieving stereo music, and the other is hands free for all handfree accesories.
To activate the first option, you need to use the MPVolumeView class which has a volume slider and a audio device selection button, when this view is added to any of the views in the app, it provides a way for the user to set the volume and select a BT device if connected ( this is the only way I found)
On the other hand, the second option can be activated using the call

<pre><code> UInt32 bt = TRUE;
 result = AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryEnableBluetoothInput , sizeof(UInt32), &amp;bt);
</code></pre>

The appliction must initialize the audio session and use the corect catagory ( it must support recoding for this to work). After the EnableBluetoothInput is set all Input and output audio will be routed through the handsfree device ( if connected of course :) )

blocks|key|1470693|text|它适用于CoreAudio：iPhone+3.0SDK能否提供对蓝牙设备(耳机)的完全访问？|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1470694|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/1020640/can-the-iphone-3-0-sdk-provide-full-access-to-bluetooth-devices-headsets/3227467#3227467^0|E|W|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

It works with CoreAudio: <a href="https://stackoverflow.com/questions/1020640/can-the-iphone-3-0-sdk-provide-full-access-to-bluetooth-devices-headsets/3227467#3227467">Can the iPhone 3.0 SDK provide full access to Bluetooth devices (headsets)?</a>

blocks|key|1824888|text|最简单的方法是向用户界面添加一个MPVolume控件(链接到文档)，并设置showsVolumeSlider+=+NO和showsRouteButton+=+YES。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1824889|用户将有一个路由按钮，将音频路由到他们选择的设备。|1824890|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.apple.com/library/ios/#documentation/mediaplayer/reference/MPVolumeView_Class/Reference/Reference.html^0|R|5|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

The easiest way is to add a MPVolume control (<a href="http://developer.apple.com/library/ios/#documentation/mediaplayer/reference/MPVolumeView_Class/Reference/Reference.html" rel="nofollow">link to documentation</a>) to your user interface and set showsVolumeSlider = NO and showsRouteButton = YES.

User will have a route button to route the audio to a device of their choice.

Is there a way to let the user select which device they use for audio output? 

In the docs I have found that you can select which route to use by setting kAudioSessionProperty_OverrideAudioRoute to either:

<ul>
<li>kAudioSessionOverrideAudioRoute_None, or</li>
<li>kAudioSessionOverrideAudioRoute_Speaker</li>
</ul>

However I would like to let the user to use their Bluetooth headset to hear the audio.

If you look in Apple's own 'Voice memos' app, in the playback menu there is a button in the top left which lets you choose which audio device to use. When a Bluetooth headset is attached, pressing the button brings up a menu which makes it possible to select between:

<ul>
<li>Bluetooth headset</li>
<li>iPhone</li>
<li>Speaker</li>
</ul>

Is there a way to achieve this functionality using standard Apple APIs in my own app?

Select Audio device on iPhone

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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是否有办法让用户选择用于音频输出的设备？在文档中，我发现您可以通过将kAudioSessionProperty_OverrideAudioRoute设置为以下两种方式之一来选择要使用的路由：kAudioSessionOverrideAudioRoute_None，或kAudioSessionOverrideAudioR...

问在iPhone上选择音频设备
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