BOOL shouldMove = NO;

- (void)checkSTU:(id)sender {

  if (slideGestureRecognizer.state == UIGestureRecognizerStateBegan || slideGestureRecognizer.state == UIGestureRecognizerStatePossible) {

    NSLog(@"[Ascend] first touch.");

int xPoint = [slideGestureRecognizer locationInView:self].x;
    int yPoint = [slideGestureRecognizer locationInView:self].y;

     if (yPoint >= 497.75 && yPoint <= 542.25 && xPoint >= 24.75 && xPoint <= 69.25)
      shouldMove = YES;



  }

  if (slideGestureRecognizer.state == UIGestureRecognizerStateChanged) {

    NSLog(@"[Ascend] X coordinate: %f", [slideGestureRecognizer locationInView:self].x);

    int xPoint = [slideGestureRecognizer locationInView:self].x;
    //int yPoint = [slideGestureRecognizer locationInView:self].y;

    int labelXPoint = [slideGestureRecognizer locationInView:STULbl].x;

        NSLog(@"[Ascend]xpoint: %i", xPoint);

        CGPoint newFrame = STUImgView.center;
        newFrame.x = xPoint;
        if (shouldMove) {
          if (STUImgView.center.x >= 47 && STUImgView.center.x <= 211) {
          STUImgView.center = newFrame;
          STULbl.alpha = (CGFloat)(100/labelXPoint)-0.3;
}
        }
  }

  if (slideGestureRecognizer.state == UIGestureRecognizerStateEnded) {

         // int xPoint = [slideGestureRecognizer locationInView:self].x;
    //int yPoint = [slideGestureRecognizer locationInView:self].y;
    NSLog(@"[Ascend] STUImgView center x %f", STUImgView.center.x);
    shouldMove = NO;

        if (STUImgView.center.x >= 211) {
         //code
}

  }

}