How can I add shadow to a circle UIImageView or UIView?

Question

I am trying to make a circle UIImageView, and it works. Below is the way I use to make it:

[self.pic.layer setMasksToBounds:YES];
[self.pic.laye         


        

Answer 1

Without a container but with a background view here is my 2 cents

As a swift 2.2 extension

    image?.applyCircleShadow(5, shadowOpacity: 1)

extension UIView {
    func applyCircleShadow(shadowRadius: CGFloat = 2,
                           shadowOpacity: Float = 0.3,
                           shadowColor: CGColor = UIColor.blackColor().CGColor,
                           shadowOffset: CGSize = CGSize.zero) {
        layer.cornerRadius = frame.size.height / 2
        layer.masksToBounds = false
        layer.shadowColor = shadowColor
        layer.shadowOffset = shadowOffset
        layer.shadowRadius = shadowRadius
        layer.shadowOpacity = shadowOpacity
    }
}
extension UIImageView {
    override func applyCircleShadow(shadowRadius: CGFloat = 2,
                                    shadowOpacity: Float = 0.3,
                                    shadowColor: CGColor = UIColor.blackColor().CGColor,
                                    shadowOffset: CGSize = CGSize.zero) {

        // Use UIImageView.hashvalue as background view tag (should be unique)
        let background: UIView = superview?.viewWithTag(hashValue) ?? UIView()
        background.frame = frame
        background.backgroundColor = backgroundColor
        background.tag = hashValue
        background.applyCircleShadow(shadowRadius, shadowOpacity: shadowOpacity, shadowColor: shadowColor, shadowOffset: shadowOffset)
        layer.cornerRadius = background.layer.cornerRadius
        layer.masksToBounds = true
        superview?.insertSubview(background, belowSubview: self)
    }
}