iOS Shadow view

iOS can dynamically generate shadows for any UIView

Overview:

1. shadowColor is the color of the shadow & need to be a CGColor.
2. shadowRadius is the width of the shadow along the shadow path.
3. shadowOpacity determines the opacity of the shadow.
4. shadowOffset is a CGSize representing how far to offset the shadow from the path.

//MARK:- ShadowView
extension UIView {
    //Shadow view
    func dropShadow(color: UIColor, opacity: Float = 0.5, offSet: CGSize, radius: CGFloat = 1, scale: Bool = true) {
        self.layer.masksToBounds = false
        self.layer.shadowColor = color.cgColor
        self.layer.shadowOpacity = opacity
        self.layer.shadowOffset = offSet
        self.layer.shadowRadius = radius
        self.layer.shadowPath = UIBezierPath(rect: self.bounds).cgPath
        self.layer.shouldRasterize = true
        self.layer.rasterizationScale = scale ? UIScreen.main.scale : 1
    }
}

You can use inside viewDidLayoutSubviews, its due to update constraints properly for shadow view.

Example:

//MARK:- viewDidLayoutSubviews
override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()
    self.yourView.dropShadow(color: .black, opacity: 1, offSet: CGSize(width: -1, height: 1), radius: 3, scale: true)
}

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Cheers 🍻