iOS Swift how to add a shadow to a transparent UIView

Question

Im using an UIView as an overlay with a drop shadow, however once I set the UIView background color to .clear, I no longer see the shadow, is there a way to add shadows to an UIView with clear background color?

Transparent objects don't cast shadows. Try using an image instead — Leo Dabus, Oct 22 '17 at 04:11
That makes sense, I figured out another way to do the overlay which doesnt use transparent UIViews — mding5692, Oct 22 '17 at 04:20
@mding5692 did you managed to find a solution to this? If so then post your solution so others can use it in the future — sam_smith, Mar 21 '18 at 03:14
Please find my answer to this question here: https://stackoverflow.com/a/56194429/8903877 — Ross Krasner, May 17 '19 at 22:53
the correct way to add shadows with a hole in the middle: https://stackoverflow.com/a/59092828/294884 — Fattie, Nov 25 '22 at 14:11

score -3 · Answer 1 · answered Apr 28 '18 at 10:37

Yes It is work by giving opacity layer less than 10

@IBInspectable var shadowOffsetX : CGFloat = 0

@IBInspectable var shadowOffsetY : CGFloat = 0

@IBInspectable var shadowColor : UIColor? {
    didSet{
        self.layer.shadowColor = shadowColor?.cgColor
    }
}

@IBInspectable var shadowOpacity : Float = 0 {
    didSet{
        self.layer.shadowOpacity = shadowOpacity
    }
}

@IBInspectable var shadowRadius : CGFloat = 0 {
    didSet{
        self.layer.shadowRadius = shadowRadius
    }
}

@IBInspectable var cornerRadius : CGFloat = 0 {
    didSet{
        layer.cornerRadius = cornerRadius
        layer.masksToBounds = true
    }
}

@IBInspectable var borderWidth : CGFloat = 0 {
    didSet{
        layer.borderWidth = borderWidth
    }
}

@IBInspectable var borderColor : UIColor? {
    didSet{
        layer.borderColor = borderColor?.cgColor
    }
}

@IBInspectable var layerOpacity : Float = 0 {
    didSet{
        self.layer.opacity = layerOpacity
    }
}

override func awakeFromNib() {
    super.awakeFromNib()
    self.layer.shadowOffset = CGSize(width: shadowOffsetX, height: shadowOffsetY)
}

pls add some information about why your answer is correct or what you do — tung, Apr 28 '18 at 10:50

iOS Swift how to add a shadow to a transparent UIView

1 Answers1