I'm trying to create a button with rounded corners and a drop shadow. No matter how I switch up, the button will not display correctly. I've tried masksToBounds = false and masksToBounds = true, but either the corner radius works and the shadow does not or the shadow works and the corner radius doesn't clip the corners of the button.
import UIKit
import QuartzCore
@IBDesignable
class Button : UIButton
{
@IBInspectable var masksToBounds: Bool = false {didSet{updateLayerProperties()}}
@IBInspectable var cornerRadius : CGFloat = 0 {didSet{updateLayerProperties()}}
@IBInspectable var borderWidth : CGFloat = 0 {didSet{updateLayerProperties()}}
@IBInspectable var borderColor : UIColor = UIColor.clearColor() {didSet{updateLayerProperties()}}
@IBInspectable var shadowColor : UIColor = UIColor.clearColor() {didSet{updateLayerProperties()}}
@IBInspectable var shadowOpacity: CGFloat = 0 {didSet{updateLayerProperties()}}
@IBInspectable var shadowRadius : CGFloat = 0 {didSet{updateLayerProperties()}}
@IBInspectable var shadowOffset : CGSize = CGSizeMake(0, 0) {didSet{updateLayerProperties()}}
override func drawRect(rect: CGRect)
{
updateLayerProperties()
}
func updateLayerProperties()
{
self.layer.masksToBounds = masksToBounds
self.layer.cornerRadius = cornerRadius
self.layer.borderWidth = borderWidth
self.layer.borderColor = borderColor.CGColor
self.layer.shadowColor = shadowColor.CGColor
self.layer.shadowOpacity = CFloat(shadowOpacity)
self.layer.shadowRadius = shadowRadius
self.layer.shadowOffset = shadowOffset
}
}
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])
}
}
The previous code produces the image below in the iPhone simulator:
My custom button with some shadow and rounded corners, I use it directly within the Storyboard with no need to touch it programmatically.
Swift 4
class RoundedButtonWithShadow: UIButton {
override func awakeFromNib() {
super.awakeFromNib()
self.layer.masksToBounds = false
self.layer.cornerRadius = self.frame.height/2
self.layer.shadowColor = UIColor.black.cgColor
self.layer.shadowPath = UIBezierPath(roundedRect: self.bounds, cornerRadius: self.layer.cornerRadius).cgPath
self.layer.shadowOffset = CGSize(width: 0.0, height: 3.0)
self.layer.shadowOpacity = 0.5
self.layer.shadowRadius = 1.0
}
}
To expand on Imanou's post, it's possible to programmatically add the shadow layer in the custom button class
@IBDesignable class CustomButton: UIButton {
var shadowAdded: Bool = false
@IBInspectable var cornerRadius: CGFloat = 0 {
didSet {
layer.cornerRadius = cornerRadius
layer.masksToBounds = cornerRadius > 0
}
}
override func drawRect(rect: CGRect) {
super.drawRect(rect)
if shadowAdded { return }
shadowAdded = true
let shadowLayer = UIView(frame: self.frame)
shadowLayer.backgroundColor = UIColor.clearColor()
shadowLayer.layer.shadowColor = UIColor.darkGrayColor().CGColor
shadowLayer.layer.shadowPath = UIBezierPath(roundedRect: bounds, cornerRadius: self.cornerRadius).CGPath
shadowLayer.layer.shadowOffset = CGSize(width: 1.0, height: 1.0)
shadowLayer.layer.shadowOpacity = 0.5
shadowLayer.layer.shadowRadius = 1
shadowLayer.layer.masksToBounds = true
shadowLayer.clipsToBounds = false
self.superview?.addSubview(shadowLayer)
self.superview?.bringSubviewToFront(self)
}
}
An alternative way to get more usable and consistent button.
Swift 2
func getImageWithColor(color: UIColor, size: CGSize, cornerRadius:CGFloat) -> UIImage {
let rect = CGRectMake(0, 0, size.width, size.height)
UIGraphicsBeginImageContextWithOptions(size, false, 1)
UIBezierPath(
roundedRect: rect,
cornerRadius: cornerRadius
).addClip()
color.setFill()
UIRectFill(rect)
let image: UIImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image
}
let button = UIButton(type: .Custom)
button.frame = CGRectMake(20, 20, 200, 50)
button.setTitle("My Button", forState: UIControlState.Normal)
button.setTitleColor(UIColor.blackColor(), forState: UIControlState.Normal)
self.addSubview(button)
let image = getImageWithColor(UIColor.whiteColor(), size: button.frame.size, cornerRadius: 5)
button.setBackgroundImage(image, forState: UIControlState.Normal)
button.layer.shadowRadius = 5
button.layer.shadowColor = UIColor.blackColor().CGColor
button.layer.shadowOpacity = 0.5
button.layer.shadowOffset = CGSizeMake(0, 1)
button.layer.masksToBounds = false
Swift 3
func getImageWithColor(_ color: UIColor, size: CGSize, cornerRadius:CGFloat) -> UIImage? {
let rect = CGRect(x: 0, y: 0, width: size.width, height: size.height)
UIGraphicsBeginImageContextWithOptions(size, false, 0)
color.setFill()
UIBezierPath(roundedRect: rect, cornerRadius: cornerRadius).addClip()
color.setFill()
UIRectFill(rect)
let image: UIImage = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()
return image
}
let button = UIButton(type: .custom)
button.frame = CGRect(x:20, y:20, width:200, height:50)
button.setTitle("My Button", for: .normal)
button.setTitleColor(UIColor.black, for: .normal)
self.addSubview(button)
if let image = getImageWithColor(UIColor.white, size: button.frame.size, cornerRadius: 5) {
button.setBackgroundImage(image, for: .normal)
}
button.layer.shadowRadius = 5
button.layer.shadowColor = UIColor.black.cgColor
button.layer.shadowOpacity = 0.5
button.layer.shadowOffset = CGSize(width:0, height:1)
button.layer.masksToBounds = false
To improve PiterPan's answer and show a real shadow (not just a background with no blur) with a circular button in Swift 3:
override func viewDidLoad() {
super.viewDidLoad()
myButton.layer.masksToBounds = false
myButton.layer.cornerRadius = myButton.frame.height/2
myButton.clipsToBounds = true
}
override func viewDidLayoutSubviews() {
addShadowForRoundedButton(view: self.view, button: myButton, opacity: 0.5)
}
func addShadowForRoundedButton(view: UIView, button: UIButton, opacity: Float = 1) {
let shadowView = UIView()
shadowView.backgroundColor = UIColor.black
shadowView.layer.opacity = opacity
shadowView.layer.shadowRadius = 5
shadowView.layer.shadowOpacity = 0.35
shadowView.layer.shadowOffset = CGSize(width: 0, height: 0)
shadowView.layer.cornerRadius = button.bounds.size.width / 2
shadowView.frame = CGRect(origin: CGPoint(x: button.frame.origin.x, y: button.frame.origin.y), size: CGSize(width: button.bounds.width, height: button.bounds.height))
self.view.addSubview(shadowView)
view.bringSubview(toFront: button)
}
If somebody need add shadows to rounded buttons in Swift 3.0, here is a good method to do it.
func addShadowForRoundedButton(view: UIView, button: UIButton, shadowColor: UIColor, shadowOffset: CGSize, opacity: Float = 1) {
let shadowView = UIView()
shadowView.backgroundColor = shadowColor
shadowView.layer.opacity = opacity
shadowView.layer.cornerRadius = button.bounds.size.width / 2
shadowView.frame = CGRect(origin: CGPoint(x: button.frame.origin.x + shadowOffset.width, y: button.frame.origin.y + shadowOffset.height), size: CGSize(width: button.bouds.width, height: button.bounds.height))
self.view.addSubview(shadowView)
view.bringSubview(toFront: button)
}
Use this method in func viewDidLayoutSubviews() as bellow:
override func viewDidLayoutSubviews() {
addShadowForRoundedButton(view: self.view, button: button, shadowColor: .black, shadowOffset: CGSize(width: 2, height: 2), opacity: 0.5)
}
The effect of this method is:
Refactored this to support any view. Subclass your view from this and it should have rounded corners. If you add something like a UIVisualEffectView as a subview to this view you likely need to use the same rounded corners on that UIVisualEffectView or it won't have rounded corners.
/// Inspiration: https://stackoverflow.com/a/25475536/129202
class ViewWithRoundedcornersAndShadow: UIView {
private var theShadowLayer: CAShapeLayer?
override func layoutSubviews() {
super.layoutSubviews()
if self.theShadowLayer == nil {
let rounding = CGFloat.init(22.0)
let shadowLayer = CAShapeLayer.init()
self.theShadowLayer = shadowLayer
shadowLayer.path = UIBezierPath.init(roundedRect: bounds, cornerRadius: rounding).cgPath
shadowLayer.fillColor = UIColor.clear.cgColor
shadowLayer.shadowPath = shadowLayer.path
shadowLayer.shadowColor = UIColor.black.cgColor
shadowLayer.shadowRadius = CGFloat.init(3.0)
shadowLayer.shadowOpacity = Float.init(0.2)
shadowLayer.shadowOffset = CGSize.init(width: 0.0, height: 4.0)
self.layer.insertSublayer(shadowLayer, at: 0)
}
}
}
Extension to drop shadow and corner radius
extension UIView {
func dropShadow(color: UIColor, opacity: Float = 0.5, offSet: CGSize, shadowRadius: CGFloat = 1, scale: Bool = true, cornerRadius: CGFloat) {
let shadowLayer = CAShapeLayer()
shadowLayer.path = UIBezierPath(roundedRect: bounds, cornerRadius: cornerRadius).cgPath
shadowLayer.fillColor = UIColor.white.cgColor
shadowLayer.shadowColor = color.cgColor
shadowLayer.shadowPath = shadowLayer.path
shadowLayer.shadowOffset = offSet
shadowLayer.shadowOpacity = opacity
shadowLayer.shadowRadius = shadowRadius
layer.insertSublayer(shadowLayer, at: 0)
}
}
Just add the following code for corner radius and shadow,you need to give background color to the view, So the shadow doesn't affect the subviews.
func shadowOnviewWithcornerRadius(YourView:UIView)
{
YourView.layer.shadowColor = UIColor.black.cgColor;
YourView.layer.shadowOpacity = 0.5;
YourView.layer.shadowRadius = 5;
YourView.layer.shadowOffset = CGSize(width :0, height :0)
YourView.layer.masksToBounds = false;
YourView.layer.cornerRadius = 2.0;
YourView.layer.borderWidth = 0.5;
YourView.backgroundColor = UIColor.white;
}
来源：https://stackoverflow.com/questions/24644802/swift-problems-with-corner-radius-and-drop-shadow