add Shadow on UIView using swift 3

Question

prior swift 3 i was adding shadow in my UIView like this :

//toolbar is an UIToolbar (UIView)
toolbar.layer.masksToBounds = false
toolbar.layer.shadowOffset = CGSize(width: -1, height: 1)
toolbar.layer.shadowRadius = 1
toolbar.layer.shadowOpacity = 0.5

but the above code is not working in swift 3 , instead of shadow my whole View's color is turned to ugly gray

anyone knows how can we add shadow in swift 3 ?

Answer 1

/* Applies shadow over the View */

func applyShadowOnView(_ view:UIView) {

        view.layer.cornerRadius = 8
        view.layer.shadowColor = UIColor.darkGray.cgColor
        view.layer.shadowOpacity = 1
        view.layer.shadowOffset = CGSize.zero
        view.layer.shadowRadius = 5

}

Answer 2

Although the accepted answer is great and it works as it should, I've modified it to split offSet: CGSize to offsetX: CGFloat and offsetY: CGFloat.

extension UIView {
  func dropShadow(offsetX: CGFloat, offsetY: CGFloat, color: UIColor, opacity: Float, radius: CGFloat, scale: Bool = true) {
    layer.masksToBounds = false
    layer.shadowOffset = CGSize(width: offsetX, height: offsetY)
    layer.shadowColor = color.cgColor
    layer.shadowOpacity = opacity
    layer.shadowRadius = radius
    layer.shadowPath = UIBezierPath(rect: self.bounds).cgPath
    layer.shouldRasterize = true
    layer.rasterizationScale = scale ? UIScreen.main.scale : 1
  }
}

Answer 3

Swift 4

toolbar.layer.shadowColor = UIColor.hex(hexColor: "#000000", withAlpha: 1.0).cgColor
toolbar.layer.shadowOffset = CGSize.zero
toolbar.layer.shadowRadius = 1
toolbar.layer.shadowOpacity = 1
toolbar.layer.shouldRasterize = true
toolbar.layer.masksToBounds = false

Answer 4

This works for me (Swift 3 and 4)

yourView.layer.shadowColor = UIColor.gray.cgColor
yourView.layer.shadowOpacity = 0.3
yourView.layer.shadowOffset = CGSize.zero
yourView.layer.shadowRadius = 6

Answer 5

Here's how to add a shadow to a UIView in Swift 4.1:

extension UIView {
 func dropShadow(scale: Bool = true) {
    layer.masksToBounds = false
    layer.shadowColor = UIColor.black.cgColor
    layer.shadowOpacity = 0.2
    layer.shadowOffset = .zero
    layer.shadowRadius = 1

    layer.shouldRasterize = true
    layer.rasterizationScale = scale ? UIScreen.main.scale : 1
  }
}