Add Shadow on Uiview Using Swift 3

add Shadow on UIView using swift 3

CODE SNIPPET:

extension UIView {

  // OUTPUT 1
  func dropShadow(scale: Bool = true) {
    layer.masksToBounds = false
    layer.shadowColor = UIColor.black.cgColor
    layer.shadowOpacity = 0.5
    layer.shadowOffset = CGSize(width: -1, height: 1)
    layer.shadowRadius = 1

    layer.shadowPath = UIBezierPath(rect: bounds).cgPath
    layer.shouldRasterize = true
    layer.rasterizationScale = scale ? UIScreen.main.scale : 1
  }

  // OUTPUT 2
  func dropShadow(color: UIColor, opacity: Float = 0.5, offSet: CGSize, radius: CGFloat = 1, scale: Bool = true) {
    layer.masksToBounds = false
    layer.shadowColor = color.cgColor
    layer.shadowOpacity = opacity
    layer.shadowOffset = offSet
    layer.shadowRadius = radius

    layer.shadowPath = UIBezierPath(rect: self.bounds).cgPath
    layer.shouldRasterize = true
    layer.rasterizationScale = scale ? UIScreen.main.scale : 1
  }
}

NOTE: If you don't pass any parameter to that function, then the scale argument will be true by default. You can define a default value for any parameter in a function by assigning a value to the parameter after that parameter’s type. If a default value is defined, you can omit that parameter when calling the function.

OUTPUT 1:

shadowView.dropShadow()

OUTPUT 2:

shadowView.dropShadow(color: .red, opacity: 1, offSet: CGSize(width: -1, height: 1), radius: 3, scale: true)

layer.shouldRasterize = true will make the shadow static and cause a shadow for the initial state of the UIView. So I would recommend not to use layer.shouldRasterize = true in dynamic layouts like view inside a UITableViewCell.

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 <QuartzCore/QuartzCore.h>

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.

How to add shadow to UIView?

The key is to use a "container" view... you add a "shadow layer" as a Sublayer of the container view, and add the masked view as a Subview of the container.

Here is an example you can run in a Playground, that will give you just about what you've shown as your goal (you'll probably want to tweak the color values and shadow radius and offset):

import UIKit
import PlaygroundSupport

class TestViewController : UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        view.backgroundColor = UIColor.init(white: 0.8, alpha: 1.0)

        let myView = UIView(frame: CGRect(x: 0, y: 0, width: 200, height: 200))
        myView.backgroundColor = .white

        let mask = CAShapeLayer()

        let shadowpath = UIBezierPath(roundedRect: CGRect(x: 0, y: 0, width:
            myView.frame.height, height: myView.frame.height), byRoundingCorners:
            [.topRight, .bottomRight], cornerRadii: CGSize(width: 58.0, height: 0.0))

        mask.path = shadowpath.cgPath
        myView.layer.mask = mask

        let shadowLayer = CAShapeLayer()
        shadowLayer.frame = myView.bounds
        shadowLayer.path = shadowpath.cgPath
        shadowLayer.shadowOpacity = 0.5
        shadowLayer.shadowRadius = 5
        shadowLayer.shadowColor = UIColor(red: 0.2, green: 0.5, blue: 1.0, alpha: 1.0).cgColor
        shadowLayer.masksToBounds = false
        shadowLayer.shadowOffset = CGSize(width: 5.0, height: 1.0)

        let container = UIView(frame: CGRect(x: 40, y: 100, width: myView.bounds.width, height: myView.bounds.height))
        container.backgroundColor = .clear
        container.layer.addSublayer(shadowLayer)
        container.addSubview(myView)

        view.addSubview(container)

    }

}

let vc = TestViewController()
PlaygroundPage.current.liveView = vc

Result:

How to give bottom shadow to UIView in Swift 3?

Try creating custom path:

let shadowPath = UIBezierPath()
shadowPath.move(to: CGPoint(x: someView.bounds.origin.x, y: someView.frame.size.height))
shadowPath.addLine(to: CGPoint(x: someView.bounds.width / 2, y: someView.bounds.height + 7.0))
shadowPath.addLine(to: CGPoint(x: someView.bounds.width, y: someView.bounds.height))
shadowPath.close()

shadowView.layer.shadowColor = UIColor.darkGray.cgColor
shadowView.layer.shadowOpacity = 1
shadowView.layer.masksToBounds = false
shadowView.layer.shadowPath = shadowPath.cgPath
shadowView.layer.shadowRadius = 5

This gives similiar results, try to customize points positions and other values to match your needs.

IOS: How to make a shadow for UIView on 4 side (top,right,bottom and left)

Like this:

float shadowSize = 10.0f;
UIBezierPath *shadowPath = [UIBezierPath bezierPathWithRect:CGRectMake(self.avatarImageView.frame.origin.x - shadowSize / 2,
                                                                       self.avatarImageView.frame.origin.y - shadowSize / 2,
                                                                       self.avatarImageView.frame.size.width + shadowSize,
                                                                       self.avatarImageView.frame.size.height + shadowSize)];
self.avatarImageView.layer.masksToBounds = NO;
self.avatarImageView.layer.shadowColor = [UIColor blackColor].CGColor;
self.avatarImageView.layer.shadowOffset = CGSizeMake(0.0f, 0.0f);
self.avatarImageView.layer.shadowOpacity = 0.8f;
self.avatarImageView.layer.shadowPath = shadowPath.CGPath;

Swift 3 version:

    let shadowSize : CGFloat = 5.0
    let shadowPath = UIBezierPath(rect: CGRect(x: -shadowSize / 2,
                                               y: -shadowSize / 2,
                                               width: self.avatarImageView.frame.size.width + shadowSize,
                                               height: self.avatarImageView.frame.size.height + shadowSize))
    self.avatarImageView.layer.masksToBounds = false
    self.avatarImageView.layer.shadowColor = UIColor.black.cgColor
    self.avatarImageView.layer.shadowOffset = CGSize(width: 0.0, height: 0.0)
    self.avatarImageView.layer.shadowOpacity = 0.5
    self.avatarImageView.layer.shadowPath = shadowPath.cgPath

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.

How to add shadow to UIView that has round corners

I do believe the issue is with clipping the bounds. If you want to have the view clip the bounds, you should have two views - one for the shadow and one for the content.

Does this work for you?

// corner radius
featureOneView.layer.cornerRadius = 10

// shadow
featureOneView.layer.shadowColor = UIColor.black.cgColor
featureOneView.layer.shadowOffset = CGSize(width: 3, height: 3)
featureOneView.layer.shadowOpacity = 0.6
featureOneView.layer.shadowRadius = 3.0

A quick google search provided: https://stackoverflow.com/a/34984063/6885097

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