openFrameworks for iOSでデバイスの姿勢を取得する http://blog.hoppenichu.com/cpp/64

testApp.h

#import <CoreMotion/CoreMotion.h>

class testApp : public ofxiOSApp {
  CMMotionManager *motionManager;
  
  public:
    void setup();
    void update();
    void draw();
    void exit();
  
    void touchDown(ofTouchEventArgs & touch);
    void touchMoved(ofTouchEventArgs & touch);
    void touchUp(ofTouchEventArgs & touch);
    void touchDoubleTap(ofTouchEventArgs & touch);
    void touchCancelled(ofTouchEventArgs & touch);

    void lostFocus();
    void gotFocus();
    void gotMemoryWarning();
    void deviceOrientationChanged(int newOrientation);
};

testApp.mm

void testApp::setup() {
  motionManager = [[CMMotionManager alloc] init];
  [motionManager startDeviceMotionUpdates];
}

void testApp::update() {
  cout << motionManager.deviceMotion.attitude.pitch * RAD_TO_DEG << endl; // X軸回転
  cout << motionManager.deviceMotion.attitude.roll  * RAD_TO_DEG << endl; // Y軸回転
  cout << motionManager.deviceMotion.attitude.yaw   * RAD_TO_DEG << endl; // Z軸回転
}