Iphone 如何使AVCaptureDevice静音？

我有

cams

这是AVCaptureDevice，我确保闪光灯已关闭，但现在我需要关闭摄像头噪音，有办法吗

NSArray* cams = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
    AVCaptureDevice* device = nil;
    if(isBackCamera)
    {
        device = [possibleCameras objectAtIndex:0];
    }
    else
    {
        device = [possibleCameras objectAtIndex:1];
    }

    device.flashMode = AVCaptureFlashModeOff;

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我想苹果不允许你这么做

我可以在使用下面的代码编程拍摄屏幕时禁用/静音相机快门声音。已确认在iPhone 5上的iOS8.3上工作，并在App store中接受

MPVolumeView* volumeView = [[MPVolumeView alloc] init];
//find the volumeSlider
UISlider* volumeViewSlider = nil;
for (UIView *view in [volumeView subviews]){
    if ([view.class.description isEqualToString:@"MPVolumeSlider"]){
        volumeViewSlider = (UISlider*)view;
        break;
    }
}

[volumeViewSlider setValue:0.0f animated:YES];
[volumeViewSlider sendActionsForControlEvents:UIControlEventTouchUpInside];

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你看到这个了吗？你也检查过这些方法吗，