不废话了直接贴代码吧～
//修改tabbar阴影
let path = CGMutablePath()
path.addRect(self.tabBar.bounds)
self.tabBar.layer.shadowPath = path
path.closeSubpath()
self.tabBar.layer.shadowColor = UIColor.white.cgColor
self.tabBar.layer.shadowOffset = CGSize.init(width: 0, height: -5)
self.tabBar.layer.shadowRadius = 5
self.tabBar.layer.shadowOpacity = 0.8
self.tabBar.clipsToBounds = true
//去掉黑线
self.navigationController?.navigationBar.shadowImage = UIImage.init()
self.tabBar.backgroundImage = UIImage.init()
self.tabBar.shadowImage = UIImage.init()
