Set UIView Shadow
//MARK: View Shadow
func viewShadow(myView: UIView) -> UIView {
myView.layer.shadowColor = UIColor.black.cgColor
myView.layer.shadowOpacity = 1
myView.layer.shadowOffset = CGSize.zero
myView.layer.shadowRadius = 1
myView.layer.shadowPath = UIBezierPath(rect: myView.bounds).cgPath
myView.layer.shouldRasterize = true
return myView
}