检测iPhone/iPod touch附件

最后找到它-初始化音频会话对象后,-audioSessionInitialize()-可以调用audioSessionGetProperty,并获取kaudioSessionProperty的值audioInputAvailable。

AudioSessionInitialize(NULL, NULL, NULL, NULL);    
UInt32 propertySize, micConnected;
    AudioSessionGetProperty(kAudioSessionProperty_AudioInputAvailable, &propertySize, &micConnected);
    [self updateMicStatus:micConnected]; // user-created method

根据音频会话服务的文档,应该使用它,而不是使用设备型号(iPhone与iPod touch)来确定音频输入是否可用。还可以设置回调函数,通过audioSessionAddPropertyListener()监视对此属性的更改。

还不确定此属性是否也适用于通过Dock连接器连接的设备,但它似乎适用于耳机插孔。

或者你可以使用:

if (![[AVAudioSession sharedInstance] inputIsAvailable]) {
    // your code here for no audio input available
}

在 IOS 6 inputIsAvailable 是 贬低 . 将来我们需要使用 inputAvailable :

BOOL audioHWAvailable = audioSession.inputAvailable;

要确定设备是否有内置麦克风,您只需通过 [UIDevice currentDevice].model 看看是iPhone还是第二代iPod touch。对于插入坞站接口的第三方麦克风,在当前的2.2.1 SDK中不可能这样做,但可能是在更高版本中:)

这是解决方案,您可能会喜欢它,或者它对您有帮助。

在使用下面的方法之前,请写这两行

UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_None;
    AudioSessionSetProperty (kAudioSessionProperty_OverrideAudioRoute,sizeof (audioRouteOverride),&audioRouteOverride);

- (void)isHeadsetPluggedIn {

    UInt32 routeSize = sizeof (CFStringRef);
    CFStringRef route;

    AudioSessionGetProperty (kAudioSessionProperty_AudioRoute,
                                              &routeSize,
                                              &route);

    //NSLog(@"Error >>>>>>>>>> :%@", error);
    /* Known values of route:
     * "Headset"
     * "Headphone"
     * "Speaker"
     * "SpeakerAndMicrophone"
     * "HeadphonesAndMicrophone"
     * "HeadsetInOut"
     * "ReceiverAndMicrophone"
     * "Lineout"
     */

    NSString* routeStr = (NSString*)route;

    NSRange headsetRange = [routeStr rangeOfString : @"Headset"];
    NSRange receiverRange = [routeStr rangeOfString : @"Receiver"];

    if(headsetRange.location != NSNotFound) {
        // Don't change the route if the headset is plugged in.
        NSLog(@"headphone is plugged in ");
    } 
    else if (receiverRange.location != NSNotFound) {
        // Change to play on the speaker
        NSLog(@"play on the speaker");

    } 
    else {
        NSLog(@"Unknown audio route.");

    }
}