ios – iPhone 5有3个麦克风.我可以改变录制的录音吗？

// set up the audio session
NSError *error = nil;

AVAudioSession *audioSession = [AVAudioSession sharedInstance];
[audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error:&error];
[audioSession setActive:YES error:&error];

if (error != nil) { NSLog(error); }


// all available inputs
NSArray* inputs = [audioSession availableInputs];

// Locate the port corresponding to the built-in microphone
for (AVAudioSessionPortDescription* port in inputs)
{
    if ([port.portType isEqualToString:AVAudioSessionPortBuilTinR_647_11845@ic])
    {
        [self setBuilTinR_647_11845@icPort:port];
        break;
    }
}

// list all microphones
for (AVAudioSessionDatasourceDescription *micType in [audioSession inputDatasources]) {
    NSLog(@"%@ -- %@ -- %@ -- %@",micType.datasourcEID,micType.datasourcename,micType.LOCATIOn,micType.orientation );

    if ([micType.orientation isEqualToString:@"Front"]) // or @"BACk" or @"Bottom"
    {
        [micType setPreferredPolarPattern:AVAudioSessionPolarPatternOmnidirectional error:&error]; // optional
        [self.builTinR_647_11845@icPort setPreferredDatasource:micType error:&error];   
    }
}

这是如何在iPhone中选择不同的内置麦克风的基本示例.请记住,麦克风的数量不同：iPhone 5及更高版本有三个麦克风,前几代只有两个麦克风(没有后麦克风).

有关更多信息,请阅读Apples Technical Q&A.