如何设置在iPhone应用程序的硬件音量？ [英] How do you set the hardware volume in an iPhone app?

问题描述

某些iPhone应用程序，如潘多拉似乎直接操作硬件体积和到物理音量按钮作出响应。如何做到这一点？

Some iPhone applications, such as Pandora seem to directly manipulate the hardware volume and respond to physical volume button. How is this done?

AudioSessionServices可以让你获得与 kAudioSessionProperty_CurrentHardwareOutputVolume 属性的当前硬件输出音量，但它是（可能）是只读的。

AudioSessionServices allows you to get the current hardware output volume with the kAudioSessionProperty_CurrentHardwareOutputVolume property, but it is (allegedly) read-only.

推荐答案

他们用MPVolumeView，简单的添加它，它使其余的，当用户触摸它。注：在iPhone模拟器不工作。我认为，发行说明中也提到不使用它在Interface Builder中直接。

They use the MPVolumeView, simple add it and it's makes the rest when the user touch it. Note: Doesn't work in iPhone Simulator. I think the release note also mentioned do not use it direct in Interface Builder.

MPVolumeView *volumeView = [[MPVolumeView alloc] initWithFrame:CGRectMake(25, 378, 270, 30)];
[self.view addSubview:volumeView];
[volumeView release];

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