Create a shadow under a uiview

UIView-shadow.m

  UIBezierPath *shadowPath = [UIBezierPath bezierPathWithRect:self.menuView.bounds];
  self.menuView.layer.masksToBounds = NO;
  self.menuView.layer.shadowColor = [UIColor blackColor].CGColor;
  self.menuView.layer.shadowOffset = CGSizeMake(0.0f, 0.5f);
  self.menuView.layer.shadowOpacity = 0.75f;
  self.menuView.layer.shadowPath = shadowPath.CGPath;