iOS - Getting desired shadow above UITabBar

Question

I am trying to get my tab bar shadow to look like the one seen in this image:

What is the best way of doing thi

Answer 1

For Swift 5 :

tabBar.layer.shadowOffset = CGSize(width: 0, height: 0)
tabBar.layer.shadowRadius = 2
tabBar.layer.shadowColor = UIColor.black.cgColor
tabBar.layer.shadowOpacity = 0.3