iOS 传感器（随手记）

感兴趣的看官可以通过这篇文章http://www.jianshu.com/p/fb03e978bf87了解iPhone内置传感器

传感器的应用

距离传感器应用（Proximity sensor直译）

//AudioPlayer之通过距离传感器切换听筒和扬声器

- (void)addSensorObserver

{

    [[UIDevice currentDevice] setProximityMonitoringEnabled:YES];

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(sensorStateChange:) name:UIDeviceProximityStateDidChangeNotification object:nil];

}

- (void)removeSensorObserver

{

    [[UIDevice currentDevice] setProximityMonitoringEnabled:NO];//不需要时，最好关闭

    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIDeviceProximityStateDidChangeNotification object:nil];

}

- (void)sensorStateChange:(NSNotification *)notice;

{

    //NSError *error;

    //AVAudioSession *session = [AVAudioSession sharedInstance];

    //如果此时手机靠近面部放在耳朵旁，那么声音将通过听筒输出，并将屏幕变暗省电并防止耳朵触摸屏幕

    if ([[UIDevice currentDevice] proximityState] == YES)

    {

        NSLog(@"贴近耳朵");

        //[session setCategory:AVAudioSessionCategoryPlayAndRecord error:&error];

    }

    else

    {

        NSLog(@"远离耳朵");

        //[session setCategory:AVAudioSessionCategoryPlayback error:&error];

    }

/*

    if(error)

    {

        NSLog(@"Error creating session: %@",error.description);

    }

    else

    {

        [session setActive:YES error:nil];

    }

*/

}