add Shadow on UIView using swift 3

IosSwift3

Ios Problem Overview

prior swift 3 i was adding shadow in my UIView like this :

//toolbar is an UIToolbar (UIView)
toolbar.layer.masksToBounds = false
toolbar.layer.shadowOffset = CGSize(width: -1, height: 1)
toolbar.layer.shadowRadius = 1
toolbar.layer.shadowOpacity = 0.5

but the above code is not working in swift 3 , instead of shadow my whole View's color is turned to ugly gray

anyone knows how can we add shadow in swift 3 ?

Ios Solutions

Solution 1 - Ios

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()

enter image description here

OUTPUT 2:

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

enter image description here

> 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.

Solution 2 - Ios

Shadow using UIView Extension Swift 4

I would like to add one more line with selected answer! When we rasterizing the layer, It needs to be set to 2.0 for retina displays. Otherwise label text or images on that view will be blurry. So we need to add rasterizationScale also.

  extension UIView {

    func dropShadow() {
        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: self.bounds).cgPath
        layer.shouldRasterize = true
        layer.rasterizationScale = UIScreen.main.scale
    }
}

Solution 3 - Ios

Very simple and few lines of code:

let viewShadow = UIView(frame: CGRect(x: 0, y: 0, width: 200, height: 200))
viewShadow.center = self.view.center
viewShadow.backgroundColor = UIColor.yellow
viewShadow.layer.shadowColor = UIColor.red.cgColor
viewShadow.layer.shadowOpacity = 1
viewShadow.layer.shadowOffset = CGSize.zero
viewShadow.layer.shadowRadius = 5
self.view.addSubview(viewShadow)

Look like : enter image description here

Solution 4 - Ios

This works for me (Swift 3 and 4)

yourView.layer.shadowColor = UIColor.gray.cgColor
yourView.layer.shadowOpacity = 0.3
yourView.layer.shadowOffset = CGSize.zero
yourView.layer.shadowRadius = 6

Solution 5 - Ios

Very easy to use extension for UIView, editable directly from storyboard. Swift 4+

@IBDesignable extension UIView {
    @IBInspectable var shadowColor: UIColor?{
        set {
            guard let uiColor = newValue else { return }
            layer.shadowColor = uiColor.cgColor
        }
        get{
            guard let color = layer.shadowColor else { return nil }
            return UIColor(cgColor: color)
        }
    }
    
    @IBInspectable var shadowOpacity: Float{
        set {
            layer.shadowOpacity = newValue
        }
        get{
            return layer.shadowOpacity
        }
    }
    
    @IBInspectable var shadowOffset: CGSize{
        set {
            layer.shadowOffset = newValue
        }
        get{
            return layer.shadowOffset
        }
    }
    
    @IBInspectable var shadowRadius: CGFloat{
        set {
            layer.shadowRadius = newValue
        }
        get{
            return layer.shadowRadius
        }
    }
}

Solution 6 - Ios

Although the accepted answer is great and it works as it should, I've modified it to split offSet: CGSize to offsetX: CGFloat and offsetY: CGFloat.

extension UIView {
  func dropShadow(offsetX: CGFloat, offsetY: CGFloat, color: UIColor, opacity: Float, radius: CGFloat, scale: Bool = true) {
    layer.masksToBounds = false
    layer.shadowOffset = CGSize(width: offsetX, height: offsetY)
    layer.shadowColor = color.cgColor
    layer.shadowOpacity = opacity
    layer.shadowRadius = radius
    layer.shadowPath = UIBezierPath(rect: self.bounds).cgPath
    layer.shouldRasterize = true
    layer.rasterizationScale = scale ? UIScreen.main.scale : 1
  }
}

Solution 7 - Ios

Swift 5 Just call this function and pass your view

public func setViewSettingWithBgShade(view: UIView)
{
    view.layer.cornerRadius = 8
    view.layer.borderWidth = 1
    view.layer.borderColor = UIColor.red.cgColor
    
    //MARK:- Shade a view
    view.layer.shadowOpacity = 0.5
    view.layer.shadowOffset = CGSize(width: 1.0, height: 1.0)
    view.layer.shadowRadius = 3.0
    view.layer.shadowColor = UIColor.black.cgColor
    view.layer.masksToBounds = false
}

Solution 8 - Ios

Please Try this

func applyShadowOnView(_ view: UIView) {
    view.layer.cornerRadius = 8
    view.layer.shadowColor = UIColor.darkGray.cgColor
    view.layer.shadowOpacity = 1
    view.layer.shadowOffset = .zero
    view.layer.shadowRadius = 5
}

Solution 9 - Ios

If you need rounded shadow. Works for swift 4.2

extension UIView {
        
        func dropShadow() {
    
            var shadowLayer: CAShapeLayer!
            let cornerRadius: CGFloat = 16.0
            let fillColor: UIColor = .white
    
            if shadowLayer == nil {
                shadowLayer = CAShapeLayer()
                
                shadowLayer.path = UIBezierPath(roundedRect: bounds, cornerRadius: cornerRadius).cgPath
                shadowLayer.fillColor = fillColor.cgColor
                
                shadowLayer.shadowColor = UIColor.black.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)
            }
        }
    }

Swift 4 rounded UIView with shadow

Solution 10 - Ios

We can apply drop shadow by following way also

    cell.view1.layer.masksToBounds = false
    cell.view1.layer.shadowColor = UIColor.lightGray.cgColor
    cell.view1.backgroundColor = UIColor.white
    cell.view1.layer.shadowOffset = CGSize(width: 1.0, height: 1.0)
    cell.view1.layer.shadowOpacity = 0.5

Result will be : http://prntscr.com/nhhv2s

Solution 11 - Ios

Please try this, it's working for me.

extension UIView {

    func dropShadow() {
    
        layer.shadowColor = UIColor.black.cgColor
        layer.shadowOffset = CGSize(width: 2, height: 3)
        layer.masksToBounds = false
    
        layer.shadowOpacity = 0.3
        layer.shadowRadius = 3
        //layer.shadowPath = UIBezierPath(rect: bounds).cgPath
        layer.rasterizationScale = UIScreen.main.scale
        layer.shouldRasterize = true
    }
}

Solution 12 - Ios

    func shadow(Vw : UIView)
    {
        Vw.layer.masksToBounds = false
        Vw.layer.shadowColor =  colorLiteral(red: 0.5058823529, green: 0.5333333333, blue: 0.6117647059, alpha: 1)
        Vw.layer.shadowOffset = CGSize(width: 0, height: 1)
        Vw.layer.shadowRadius = 5.0
        Vw.layer.shadowOpacity = 15.0
        Vw.layer.cornerRadius = 5.0
    }

Solution 13 - Ios

loginView.layer.shadowOpacity = 1.0

Solution 14 - Ios

I will suggest you to use below the library because it allows you to set default values in one file and you can use it everywhere in the project without making one line of change. https://github.com/Shahbaz89khan/ShadowView

Solution 15 - Ios

Swift 4

toolbar.layer.shadowColor = UIColor.hex(hexColor: "#000000", withAlpha: 1.0).cgColor
toolbar.layer.shadowOffset = CGSize.zero
toolbar.layer.shadowRadius = 1
toolbar.layer.shadowOpacity = 1
toolbar.layer.shouldRasterize = true
toolbar.layer.masksToBounds = false

Solution 16 - Ios

If you want to use it as a IBInspectable property for your views you can add this extension

import UIKit

extension UIView {
    
    private static var _addShadow:Bool = false
    
    @IBInspectable var addShadow:Bool {
        get {
            return UIView._addShadow
        }
        set(newValue) {
            if(newValue == true){
                layer.masksToBounds = false
                layer.shadowColor = UIColor.black.cgColor
                layer.shadowOpacity = 0.075
                layer.shadowOffset = CGSize(width: 0, height: -3)
                layer.shadowRadius = 1
                
                layer.shadowPath = UIBezierPath(rect: bounds).cgPath
                layer.shouldRasterize = true
                layer.rasterizationScale =  UIScreen.main.scale
            }
        }
    }
    
}

Solution 17 - Ios

After spent lot of hours, I just find out the solution, just add this simple line.

backgroundColor = .white

Hope this help you!

Solution 18 - Ios

Applies shadow over the View

func applyShadowOnView(_ view:UIView) {
        
        view.layer.cornerRadius = 8
        view.layer.shadowColor = UIColor.darkGray.cgColor
        view.layer.shadowOpacity = 1
        view.layer.shadowOffset = CGSize.zero
        view.layer.shadowRadius = 5

}
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