QCARHelper停止camera 打開camera

////////////////////////////////////////////////////////////////////////////////
// pause the camera view and the tracking of targets
//停止服務
- (void)pauseAR
{
    NSLog(@"QCARutils onPause()");
  
    // If the app status is APPSTATUS_CAMERA_RUNNING, QCAR must have been fully
    // initialised
    if (APPSTATUS_CAMERA_RUNNING == qUtils.appStatus) {
        [qUtils updateApplicationStatus:APPSTATUS_CAMERA_STOPPED];
      
        // QCAR-specific pause operation
        QCAR::onPause();
    }
}


////////////////////////////////////////////////////////////////////////////////
// resume the camera view and tracking of targets
//打開服務
- (void)resumeAR
{
    NSLog(@"QCARutils onResume()");
  
    // If the app status is APPSTATUS_CAMERA_STOPPED, QCAR must have been fully
    // initialised
    if (APPSTATUS_CAMERA_STOPPED == qUtils.appStatus) {
        // QCAR-specific resume operation
        QCAR::onResume();
      
        [qUtils updateApplicationStatus:APPSTATUS_CAMERA_RUNNING];
    }
}