-(void) updateVirtualStick
{
    // In rollPitchVelocity mode, the pitch property in DJIVirtualStickFlightControlData represents the Y direction velocity.
    // The roll property represents the X direction velocity.
    DJIVirtualStickFlightControlData ctrlData = {0};
    ctrlData.pitch = self.mYVelocity;
    ctrlData.roll = self.mXVelocity;
    ctrlData.yaw = self.mYaw;
    ctrlData.verticalThrottle = self.mThrottle;
    WeakRef(target);
    if (self.flightController && self.flightController.isVirtualStickControlModeAvailable) {
        [self.flightController sendVirtualStickFlightControlData:ctrlData withCompletion:^(NSError * _Nullable error) {
            WeakReturn(target);
            if (error) {
                NSLog(@"Send Control Data error!");
            }
            else
            {
                NSLog(@"Send Control Data succeeded!");
            }

        }];
    }
    else{
        NSLog(@"Virtual Stick Control Mode not Availabe!");
    }
}