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.layer setCornerRadius:50.0];

I would like to add some shadow to the UIImageView. The below code does add some shadow to my image view, however, the image view changes back to square shape. Can someone give me some pointers to solve this problem? Below is the code I use to add the shadow:

self.pic.layer.shadowColor = [UIColor purpleColor].CGColor;
self.pic.layer.shadowOffset = CGSizeMake(0, 1);
self.pic.layer.shadowOpacity = 1;
self.pic.layer.shadowRadius = 1.0;
self.pic.clipsToBounds = NO;

Solution 1

Use the CALayer's shadowPath property and add a UIBezierPath with rounded rect

self.pic.layer.shadowPath = [UIBezierPath bezierPathWithRoundedRect:self.pic.frame cornerRadius:50.0].CGPath;

EDIT

For a square-ish image view this technique does not work directly because, as you said, the image view goes back to square. Reason: You set clipsToBounds = NO to show the shadow which removes the clipping for corner radius, where imageView is subview of container.

Workaround:
Add your imageview in a container view and then apply the layer shadow to this container. Following is the code I tried.

[self.imageView.layer setCornerRadius:60.0];
[self.imageView.layer setMasksToBounds:YES];
self.imageView.clipsToBounds = YES;

self.container.backgroundColor = [UIColor clearColor];
self.container.layer.shadowColor = [UIColor blackColor].CGColor;
self.container.layer.shadowOffset = CGSizeMake(5,15);
self.container.layer.shadowOpacity = 0.5;
self.container.layer.shadowRadius = 2.0;
self.container.layer.shadowPath = [UIBezierPath bezierPathWithRoundedRect:self.container.bounds cornerRadius:100.0].CGPath;

The resultant effect is as shown in the screenshot,

Solution 2

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)
    }
}

Solution 3

In case anyone looks for Swift 3 or 4 working solution:

    let imageSize: CGFloat = 64.0

    // Create a container which has a shadow
    let imageCotainer = UIView(frame: CGRect(x: 0, y: 0, width: imageSize, height: imageSize))
    imageCotainer.clipsToBounds = false
    imageCotainer.layer.shadowColor = UIColor.black.cgColor
    imageCotainer.layer.shadowOpacity = 0.2
    imageCotainer.layer.shadowOffset = CGSize(width: 0, height: 1)
    imageCotainer.layer.shadowRadius = 2

    // Create an image view that will be inserted into the container view
    let imageView = UIImageView(frame: imageCotainer.bounds)
    imageView.image = yourImage
    imageView.clipsToBounds = true
    let cornerRadius = imageView.frame.height / 2
    imageView.layer.cornerRadius = cornerRadius

    // Draw a shadow
    imageCotainer.layer.shadowPath = UIBezierPath(roundedRect: imageCotainer.bounds, cornerRadius: cornerRadius).cgPath
    // Add image into container
    imageCotainer.addSubview(imageView)

Sometimes you also need to set constraints for image inside of the container, but it may work without it too in some cases. But if it's not, add this:

    // Set constraints for the image inside the container view
    imageView.translatesAutoresizingMaskIntoConstraints = false
    imageView.topAnchor.constraint(equalTo: imageCotainer.topAnchor).isActive = true
    imageView.leftAnchor.constraint(equalTo: imageCotainer.leftAnchor).isActive = true
    imageView.rightAnchor.constraint(equalTo: imageCotainer.rightAnchor).isActive = true
    imageView.bottomAnchor.constraint(equalTo: imageCotainer.bottomAnchor).isActive = true
    imageView.heightAnchor.constraint(equalToConstant: imageSize).isActive = true
    imageView.widthAnchor.constraint(equalToConstant: imageSize).isActive = true

Solution 4

I created custom classes (swift 3 or 4) and it works very well :

class RoundShadowImageView: RoundView {

    var imageView = RoundImageView()

    var image: UIImage!  {
        didSet {
            imageView.image = image
        }
    }

    override init(frame: CGRect) {
        super.init(frame: frame)
        addSubview(imageView)
        needsUpdateConstraints()
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        addSubview(imageView)
        needsUpdateConstraints()
    }

    override func layoutSubviews() {
        super.layoutSubviews()

        clipsToBounds = false
        layer.shadowColor = UIColor.black.cgColor
        layer.shadowOpacity = 0.1
        layer.shadowOffset = CGSize(width: 0, height: 10)
        layer.shadowRadius = 10
        layer.shadowPath = UIBezierPath(roundedRect: bounds, cornerRadius: frame.height / 2.0).cgPath
    }

    override func updateConstraints() {
        super.updateConstraints()

        imageView.snp.makeConstraints { (make) -> Void in
            make.height.width.equalTo(self)
            make.center.equalTo(self)
        }
    }
}

class RoundImageView: UIImageView {

    override func layoutSubviews() {
        super.layoutSubviews()
        let radius: CGFloat = self.bounds.size.height / 2.0
        layer.cornerRadius = radius
        clipsToBounds = true
    }
}

class RoundView: UIView {

    override func layoutSubviews() {
        super.layoutSubviews()
        let radius: CGFloat = self.bounds.size.height / 2.0
        layer.cornerRadius = radius
        clipsToBounds = true
    }
}

There are 2 classes to make a container and an image view round. And the main class which combines both of them: the one that you'll call.

Solution 5

I might be a bit late.

You can easily set the required attributes on the storyboard attribute inspector.

The result would be something like this.

View more solutions

Comments

[Newbie]

I have added the line of code that you suggest into my code, but it doesn't work. Can you elaborate more on how to make use of the above code? thank you.

[Amar]

@Newbie Did that help?

[Newbie]

ya, that helps. Thanks a lot.

[mkc842]

Note that when he says "Add your imageview in a container view," he means add it as a subview of a normal UIView; using IB's "Container View" object would complicate things.

[CoderNinja]

how does shadowradius affect the actual circular shadow?

[Fayza Nawaz]

great solution, but i don't know why it's not working in case of 7+

[A. Bandtock]

While this code may answer the question, providing additional context regarding why and/or how this code answers the question improves its long-term value.

[akaralar]

This doesn't answer the question as the author wants to clip the image view to a circle, and this code disables clipping

[Sandeep Rana]

I still can. Please check that you have selected the type as Number

[Shai Balassiano]

I think the use of "isShadowPathAutosizing" requires this pod: github.com/CosmicMind/Material

[Antonio Adrian Chavez]

how to add ring behind the shadow, which means look familiar to SwiftUI style? Thanks.