Can't set cornerRadius AND shadow on layer that has an image view stretched to its bounds?

Question

This is stumping me. I have a UIView (call it \"parent\"). The bottommost subview of that view is a UIImageView (call it \"child\"), whose frame occupies the entirety of the

Answer 1

With Swift 3, you can choose one of the two following code snippets in order to set cornerRadius and shadow on an image view or on a view that contains an image layer.

---

#1. Using UIView, CALayer and Spring and Struts

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // constants
        let radius: CGFloat = 20, dimension: CGFloat = 200, offset = 8
        let frame = CGRect(x: 0, y: 0, width: 200, height: 200)

        // custom view
        let customView = UIView(frame: frame)
        customView.contentMode = .scaleAspectFill

        // image layer
        let imageLayer = CALayer()
        imageLayer.contentsGravity = kCAGravityResizeAspectFill
        imageLayer.contents = UIImage(named: "image")!.cgImage
        imageLayer.masksToBounds = true
        imageLayer.frame = frame
        imageLayer.cornerRadius = radius
        imageLayer.masksToBounds = true

        // rounded layer
        let roundedLayer = CALayer()
        roundedLayer.shadowColor = UIColor.darkGray.cgColor
        roundedLayer.shadowPath = UIBezierPath(roundedRect: CGRect(x: 0, y: 0, width: dimension, height: dimension), cornerRadius: radius).cgPath
        roundedLayer.shadowOffset = CGSize(width: offset, height: offset)
        roundedLayer.shadowOpacity = 0.8
        roundedLayer.shadowRadius = 2
        roundedLayer.frame = frame

        // views and layers hierarchy
        customView.layer.addSublayer(imageLayer)
        customView.layer.insertSublayer(roundedLayer, below: imageLayer)
        view.addSubview(customView)

        // layout
        customView.center = CGPoint(x: view.bounds.midX, y: view.bounds.midY)
        customView.autoresizingMask = [UIViewAutoresizing.flexibleLeftMargin, .flexibleRightMargin, .flexibleTopMargin, .flexibleBottomMargin]
    }

}

---

#2. Using UIView, UIImageView, CALayer and Auto Layout

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // constants
        let radius: CGFloat = 20, dimension: CGFloat = 200, offset = 8

        // image view
        let imageView = UIImageView(image: UIImage(named: "image"))
        imageView.contentMode = .scaleAspectFill
        imageView.layer.cornerRadius = radius
        imageView.layer.masksToBounds = true

        // rounded view
        let roundedView = UIView()
        roundedView.layer.shadowColor = UIColor.darkGray.cgColor
        roundedView.layer.shadowPath = UIBezierPath(roundedRect: CGRect(x: 0, y: 0, width: dimension, height: dimension), cornerRadius: radius).cgPath
        roundedView.layer.shadowOffset = CGSize(width: offset, height: offset)
        roundedView.layer.shadowOpacity = 0.8
        roundedView.layer.shadowRadius = 2

        // views hierarchy
        roundedView.addSubview(imageView)
        view.addSubview(roundedView)

        // layout
        imageView.translatesAutoresizingMaskIntoConstraints = false
        roundedView.translatesAutoresizingMaskIntoConstraints = false
        roundedView.widthAnchor.constraint(equalToConstant: dimension).isActive = true
        roundedView.heightAnchor.constraint(equalToConstant: dimension).isActive = true
        imageView.widthAnchor.constraint(equalTo: roundedView.widthAnchor).isActive = true
        imageView.heightAnchor.constraint(equalTo: roundedView.heightAnchor).isActive = true
        roundedView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
        roundedView.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
        imageView.centerXAnchor.constraint(equalTo: roundedView.centerXAnchor).isActive = true
        imageView.centerYAnchor.constraint(equalTo: roundedView.centerYAnchor).isActive = true
    }

}

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Both code snippets generate the following display:

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You can find more ways to combine images with rounded corners and shadow on this Github repo.

Answer 2

Normally you have to set clipsToBounds to have rounded corners, but since you want to retain the shadow you have to round the corners of the shadow as well. Have you tried setting the shadow path using a bezier path? Keep clipsToBounds/masksToBounds to the default, NO. Something like:

  [[parent layer] setCornerRadius:6.0f];
  [[parent layer] setShadowPath:
             [[UIBezierPath bezierPathWithRoundedRect:[parent bounds] 
                   cornerRadius:6.0f] CGPath]];

Answer 3

If you want shadow layer with corner radius for imageview is that better solution put imageview a view as subview with 1 point margin.. and

 imgBrandLogo.backgroundColor = UIColor.blue
    imgBrandLogo.layer.cornerRadius = imgBrandLogo.frame.height/2
    imgBrandLogo.clipsToBounds = true
    viewBrandLogo.layer.shadowColor = UIColor(rgb:0x262626,alpha:0.24).cgColor
    viewBrandLogo.layer.shadowOffset = CGSize(width: 0, height: 1)
    viewBrandLogo.layer.shadowOpacity = 1
    viewBrandLogo.layer.shadowPath = UIBezierPath(roundedRect:imgBrandLogo.bounds , cornerRadius: imgBrandLogo.frame.height/2).cgPath
    viewBrandLogo.backgroundColor = UIColor.clear.withAlphaComponent(0.0)

Answer 4

Have you tried setting the bounds of the child UIImageView so that it also has rounded corners? Perhaps then it wouldn't override the shadow of the container view. Just a thought, not sure if it will work.

Answer 5

You will need two nested views, the inner one setting rounded corners and clipping to bound, and the outer view having the shadow (and therefore not clipping). In your case inner and outer view will probably be "child" and "parent", but I guess you didn't set the right clipping values for these views?

See the answer in Why masksToBounds = YES prevents CALayer shadow?.