ios检测设备摄像头、指南针、录音、陀螺仪的状态

原创地址：http://blog.csdn.net/like7xiaoben/article/details/9250189
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//检查前后摄像头

BOOL cameraAvailable = [UIImagePickerController
isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceRear];//前

BOOL frontCameraAvailable = [UIImagePickerController
isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceFront];//后

//检查指南针 CoreLocation.framework  <CoreLocation/CoreLocation.h>
BOOL magnetometerAvailbale = [CLLocationManager headingAvailable];

//检查声音支持 AVFoundation.framework <AVFoundation/AVFoundation.h>
AVAudioSession *audioSession = [AVAudioSession sharedInstance]; 
//返回一个AVAudioSession实例
BOOL audioAvailable = audioSession.inputAvailable;//bool值。获取是否支持

//检查录像支持 MobileCoreServices.framework <MobileCoreServices/MobileCoreServices.h>
- (BOOL)isvideoCameraAvailable
{

    //简单检查所有的可用的媒体资源类型，然后检查返回的数组，如果其中包含了kUTTypeMovie的NSString类型对象，就证明摄像头支持录像
    UIImagePickerController *picker = [[UIImagePickerController alloc]init];
    NSArray *sourceTypes = [UIImagePickerController availableMediaTypesForSourceType:picker.sourceType];//返回所支持的media的类型数组
    [picker release];

    
   
if (![sourceTypes containsObject:(NSString *)kUTTypeMovie]) {//containsObject确定数组中是否包含后面的对象
       
return NO;
    }

    return
YES;
}

//检查陀螺仪可用 CoreMotion.framework <CoreMotion/CoreMotion.h>
- (BOOL) isGyroscopeAvailable
{

#ifdef __IPHONE_4_0//4.0之后才有
    CMMotionManager *motionManager = [[CMMotionManager alloc]init];
   
BOOL gyroscopeAvailable = motionManager.gyroAvailable;
    [motionManager release];
   
return gyroscopeAvailable;

#else

    return
NO;

#endif
}

原创地址：http://blog.csdn.net/like7xiaoben/article/details/9250189
尊重原创，保护原创作者权益，转载请注明出处！