Hi. i am rotating imageview through following code.it rotates fine..but when i rotate again , Imageview goes to previous angle( which is in initial stage) and then it rotates...any one can help in this?rotationTransform has been declared as CABasicAnimation* rotationAnimation in .h file....

- (void) touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event
{

         UITouch *touch = [touches anyObject]; 

       startTouchPosition = [touch locationInView:self.view]; 

 }


 - (void) touchesMoved:(NSSet*)touches withEvent:(UIEvent*)event
 {


    UITouch *touch = [[event allTouches] anyObject];
    location = [touch locationInView:self.view];

    currentLocationRadians = atan2f(location.y - self.view.frame.size.height/2, location.x - self.view.frame.size.width/2);
    lastLocationRadians = atan2f(startTouchPosition.y - self.view.frame.size.height/2, startTouchPosition.x - self.view.frame.size.width/2);
     rotationTransform = CATransform3DIdentity;

    rotationTransform = CATransform3DRotate(rotationTransform, currentLocationRadians-lastLocationRadians + rad, 0.0, 0.0, 1.0);
    _imgview.layer.transform = rotationTransform;
}
  - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event 
   {

rotationTransform = _imgview.layer.transform;

    }