self.tabBar.barStyle = UIBarStyle.default
self.tabBar.layer.shadowColor = UIColor.siShadowVC.cgColor
self.tabBar.layer.shadowOpacity = 0.8
self.tabBar.layer.shadowOffset = CGSize.zero
self.tabBar.layer.shadowRadius = 3
self.tabBar.shadowImage = UIImage()
self.tabBar.backgroundImage = UIImage()