Swift - Problems with Corner Radius and Drop Shadow

Swift - Problems with corner radius and drop shadow

The following Swift 5 / iOS 12 code shows how to set a subclass of UIButton that allows to create instances with rounded corners and shadow around it:

import UIKit

final class CustomButton: UIButton {

    private var shadowLayer: CAShapeLayer!

    override func layoutSubviews() {
        super.layoutSubviews()

        if shadowLayer == nil {
            shadowLayer = CAShapeLayer()
            shadowLayer.path = UIBezierPath(roundedRect: bounds, cornerRadius: 12).cgPath
            shadowLayer.fillColor = UIColor.white.cgColor

            shadowLayer.shadowColor = UIColor.darkGray.cgColor
            shadowLayer.shadowPath = shadowLayer.path
            shadowLayer.shadowOffset = CGSize(width: 2.0, height: 2.0)
            shadowLayer.shadowOpacity = 0.8
            shadowLayer.shadowRadius = 2

            layer.insertSublayer(shadowLayer, at: 0)
            //layer.insertSublayer(shadowLayer, below: nil) // also works
        }        
    }

}

According to your needs, you may add a UIButton in your Storyboard and set its class to CustomButton or you may create an instance of CustomButton programmatically. The following UIViewController implementation shows how to create and use a CustomButton instance programmatically:

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        let button = CustomButton(type: .system)
        button.setTitle("Button", for: .normal)
        view.addSubview(button)

        button.translatesAutoresizingMaskIntoConstraints = false
        let horizontalConstraint = button.centerXAnchor.constraint(equalTo: view.centerXAnchor)
        let verticalConstraint = button.centerYAnchor.constraint(equalTo: view.centerYAnchor)        
        let widthConstraint = button.widthAnchor.constraint(equalToConstant: 100)
        let heightConstraint = button.heightAnchor.constraint(equalToConstant: 100)
        NSLayoutConstraint.activate([horizontalConstraint, verticalConstraint, widthConstraint, heightConstraint])
    }

}

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The previous code produces the image below in the iPhone simulator:

UIView with rounded corners and drop shadow?

The following code snippet adds a border, border radius, and drop shadow to v, a UIView:

// border radius
[v.layer setCornerRadius:30.0f];

// border
[v.layer setBorderColor:[UIColor lightGrayColor].CGColor];
[v.layer setBorderWidth:1.5f];

// drop shadow
[v.layer setShadowColor:[UIColor blackColor].CGColor];
[v.layer setShadowOpacity:0.8];
[v.layer setShadowRadius:3.0];
[v.layer setShadowOffset:CGSizeMake(2.0, 2.0)];

Swift 5 Version :

// border radius
v.layer.cornerRadius = 30.0

// border
v.layer.borderColor = UIColor.lightGray.cgColor
v.layer.borderWidth = 1.5

// drop shadow
v.layer.shadowColor = UIColor.black.cgColor
v.layer.shadowOpacity = 0.8
v.layer.shadowRadius = 3.0
v.layer.shadowOffset = CGSize(width: 2.0, height: 2.0)

You can adjust the settings to suit your needs.

Also, add the QuartzCore framework to your project and:

#import 

See my other answer regarding masksToBounds.

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Note

This may not work in all cases. If you find that this method interferes with other drawing operations that you are performing, please see this answer.

UIView shadow, cornerradius not working

your code is fine but you forget to set the opacity, if you need the more information you can get the another answer in SO, for e.g

 selectorSemiView.layer.cornerRadius = 15
    selectorSemiView.layer.shadowColor = UIColor.gray.cgColor
    selectorSemiView.layer.shadowOffset = CGSize.zero  
    selectorSemiView.layer.shadowOpacity = 1.0
    selectorSemiView.layer.shadowRadius = 7.0
    selectorSemiView.layer.masksToBounds =  false

output

How to add shadow for 3 sides only with corner radius in swift?

The answer of Ryan Pools here should work for you. The topic is similar.

rounded edges with a shadow

Add dummy container view and assign it the shadow, after that put inside of it the image view like this:
Declare your objects under your class controller:

let imgV = UIImageView()
let dummyView = UIView()

after that in viewdidLoad set property and constraints:

imgV.image = UIImage(named: "yourImage")
imgV.contentMode = .scaleToFill
imgV.layer.cornerRadius = 20
imgV.clipsToBounds  = true
imgV.translatesAutoresizingMaskIntoConstraints = false
    
dummyView.center = self.view.center
dummyView.backgroundColor = UIColor.yellow
dummyView.layer.shadowColor = UIColor.gray.cgColor
dummyView.layer.shadowOpacity = 1
dummyView.layer.shadowOffset = CGSize(width: 2, height: 2)
dummyView.layer.shadowRadius = 5
dummyView.layer.cornerRadius = 20
dummyView.translatesAutoresizingMaskIntoConstraints = false
    
view.addSubview(dummyView)
dummyView.heightAnchor.constraint(equalToConstant: 200).isActive = true
dummyView.widthAnchor.constraint(equalToConstant: 200).isActive = true
dummyView.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
dummyView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
    
dummyView.addSubview(imgV)
imgV.topAnchor.constraint(equalTo: dummyView.topAnchor).isActive = true
imgV.bottomAnchor.constraint(equalTo: dummyView.bottomAnchor).isActive = true
imgV.leadingAnchor.constraint(equalTo: dummyView.leadingAnchor).isActive = true
imgV.trailingAnchor.constraint(equalTo: dummyView.trailingAnchor).isActive = true

this is the result

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