Swift-拐角半径和阴影问题

85

我正在尝试创建一个带有圆角和阴影的按钮。无论我如何切换，该按钮都将无法正确显示。我尝试了masksToBounds = false和masksToBounds = true，但是要么拐角半径有效，阴影不起作用，要么阴影起作用，并且拐角半径不限制按钮的拐角。

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
    }
}
ios  swift  shadow  xcode6  cornerradius 
— 杰克
source
您需要将阴影和裁剪放置在不同的图层上。设置图层属性drawRect并不是一个好主意。最好把它们放进去initWithCoder。
— David Berry 2014年
对于任何在这里使用谷歌搜索功能的人（就像很老的问题经常发生的那样），这里的最高答案虽然通常都正确，但现在却存在一些严重的错误。（我给出了正确的答案。）大多数人，尤其是我，总是从头至尾盲目地复制和粘贴-请注意，如果这是一个非常古老的质量检查！（现在是2020年-有人将不得不在5年后替换我的答案！）
— Fattie

Answers:

144

以下Swift 5 / iOS 12代码显示了如何设置其子类，UIButton以允许创建带有圆角和阴影的实例：

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
        }        
    }

}

根据您的需要，您可以UIButton在Storyboard中添加一个并将其类设置为CustomButton，也可以以CustomButton编程方式创建一个实例。以下UIViewController实现显示了如何以CustomButton编程方式创建和使用实例：

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])
    }

}

前面的代码在iPhone模拟器中产生以下图像：

在此处输入图片说明

— 伊马努·佩蒂（Imanou Petit）
source
使用iOS，我以前的实现存在问题，现在可以使用了。谢谢！
— carlodonz 2014年
1
您如何从主视图控制器@POB调用该类？
— 2014年
1
有没有办法修剪阴影层，只保留可见部分？
— Johan Tingbacke'2
4
由于masksToBounds = YES阴影层是按钮自身层的子层，该层必须显示圆角，所以阴影也不会被剪切掉吗？
— mattsson
3
可以正常工作，但我无法再更改按钮背景。这可能是因为shadowLayer.fillColor。你有什么建议？谢谢 ！
— GrayFox
34

我的自定义按钮带有一些阴影和圆角，可以直接在中使用它，Storyboard而无需以编程方式进行触摸。

斯威夫特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
    }
}

在此处输入图片说明

— 范围
source
快捷方便。
— Devbot10
1
对我来说，当我将代码重新放置在中时，它就成功了layoutSubviews()。
— Yash Bedi
14

为了扩展Imanou的帖子，可以以编程方式在自定义按钮类中添加阴影层

@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)
    }
}
— 马特·平克斯顿
source
2
您正在遮盖图层的阴影，我真的不建议您将阴影视图放在按钮的超级视图上。
— mattsson
13

获得更多可用和一致按钮的另一种方法。

斯威夫特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

斯威夫特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
— 艾泰克
source
1
最好使用此方法，因为您可以为.normal和高亮显示设置不同的背景颜色
— Ryan Heitner
1
真好 尝试了多种方法来使背景颜色，拐角半径和阴影在我的按钮中起作用，但这是唯一起作用的方法！谢谢！
— 哈里·布鲁姆
这是完美的解决方案，谢谢！请注意，如果以编程方式在UITableViewCell中使用UIButton，则必须将其放置在layoutSubviews（）中。
— bra.Scene
4

重构它以支持任何视图。从此子类化您的视图，它应该具有圆角。如果将类似UIVisualEffectView的内容添加为该视图的子视图，则可能需要在该UIVisualEffectView上使用相同的圆角，否则将不会有圆角。

UIView带有阴影的圆角-屏幕快照还使用了模糊，这是普通的UIVisualEffectView，也具有圆角

/// 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)
        }
    }
}
— 强尼
source
4

Swift 5， 无需“ UIBezierPath”

    view.layer.cornerRadius = 15
    view.clipsToBounds = true
    view.layer.masksToBounds = false
    view.layer.shadowRadius = 7
    view.layer.shadowOpacity = 0.6
    view.layer.shadowOffset = CGSize(width: 0, height: 5)
    view.layer.shadowColor = UIColor.red.cgColor
— 哈里·克里希纳
source
1
它从不向视图添加任何拐角半径，之所以需要这样做UIBezierPath是出于性能方面的考虑，以防您需要重用该特定视图。
— Sharkes Monken
@SharkesMonken“从不”真的！！？请再次检查。我在整个项目中都使用这种方法。如果您有任何疑问，请观看此视频 youtu.be/5qdF5ocDU7w
— Hari R Krishna
不工作；cornerRadius没有影响
— Amr Angry
请查看视频
— Hari R Krishna
2

在Swift 3中，使用圆形按钮改善PiterPan的答案并显示真实的阴影（不仅是没有模糊的背景）：

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)
}
— 顽强的
source
1

这是可行的解决方案！


extension UIView {

    func applyShadowWithCornerRadius(color:UIColor, opacity:Float, radius: CGFloat, edge:AIEdge, shadowSpace:CGFloat)    {

        var sizeOffset:CGSize = CGSize.zero
        switch edge {
        case .Top:
            sizeOffset = CGSize(width: 0, height: -shadowSpace)
        case .Left:
            sizeOffset = CGSize(width: -shadowSpace, height: 0)
        case .Bottom:
            sizeOffset = CGSize(width: 0, height: shadowSpace)
        case .Right:
            sizeOffset = CGSize(width: shadowSpace, height: 0)


        case .Top_Left:
            sizeOffset = CGSize(width: -shadowSpace, height: -shadowSpace)
        case .Top_Right:
            sizeOffset = CGSize(width: shadowSpace, height: -shadowSpace)
        case .Bottom_Left:
            sizeOffset = CGSize(width: -shadowSpace, height: shadowSpace)
        case .Bottom_Right:
            sizeOffset = CGSize(width: shadowSpace, height: shadowSpace)


        case .All:
            sizeOffset = CGSize(width: 0, height: 0)
        case .None:
            sizeOffset = CGSize.zero
        }

        self.layer.cornerRadius = self.frame.size.height / 2
        self.layer.masksToBounds = true;

        self.layer.shadowColor = color.cgColor
        self.layer.shadowOpacity = opacity
        self.layer.shadowOffset = sizeOffset
        self.layer.shadowRadius = radius
        self.layer.masksToBounds = false

        self.layer.shadowPath = UIBezierPath(roundedRect:self.bounds, cornerRadius:self.layer.cornerRadius).cgPath
    }
}

enum AIEdge:Int {
    case
    Top,
    Left,
    Bottom,
    Right,
    Top_Left,
    Top_Right,
    Bottom_Left,
    Bottom_Right,
    All,
    None
}

最后，按如下所示应用带有圆角半径的阴影：

viewRounded.applyShadowWithCornerRadius(color: .gray, opacity: 1, radius: 15, edge: AIEdge.All, shadowSpace: 15)

结果图像

在此处输入图片说明

更新：如果您没有看到预期的输出，请尝试从Main Thread调用扩展方法，这肯定会起作用！

DispatchQueue.main.async {
    viewRounded.applyShadowWithCornerRadius(color: .gray, opacity: 1, radius: 15, edge: AIEdge.All, shadowSpace: 15)
}
— 达瓦尔·H·内娜
source
0

如果有人需要在Swift 3.0中为圆形按钮添加阴影，这是一个很好的方法。

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)
}

在func viewDidLayoutSubviews()下面使用此方法：

override func viewDidLayoutSubviews() {
    addShadowForRoundedButton(view: self.view, button: button, shadowColor: .black, shadowOffset: CGSize(width: 2, height: 2), opacity: 0.5)
}

此方法的效果是： 在此处输入图片说明

— 皮特潘
source
0

扩展阴影和角半径

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)
}

}
— 安吉
source
0

2020年语法的精确解决方案

import UIKit
class ColorAndShadowButton: UIButton {
    override init(frame: CGRect) { super.init(frame: frame), common() }
    required init?(coder aDecoder: NSCoder) { super.init(coder: aDecoder), common() }
    private func common() {
        // UIButton is tricky: you MUST set the clear bg in bringup;  NOT in layout
        backgroundColor = .clear
        clipsToBounds = false
        self.layer.insertSublayer(backgroundAndShadow, below: layer)
    }
    
   lazy var colorAndShadow: CAShapeLayer = {
        let s = CAShapeLayer()
        // set your button color HERE (NOT on storyboard)
        s.fillColor = UIColor.black.cgColor
        // now set your shadow color/values
        s.shadowColor = UIColor.red.cgColor
        s.shadowOffset = CGSize(width: 0, height: 10)
        s.shadowOpacity = 1
        s.shadowRadius = 10
        // now add the shadow
        layer.insertSublayer(s, at: 0)
        return s
    }()
    
    override func layoutSubviews() {
        super.layoutSubviews()
        // you MUST layout these two EVERY layout cycle:
        colorAndShadow = bounds
        colorAndShadow = UIBezierPath(roundedRect: bounds, cornerRadius: 12).cgPath
    }
}

在此处输入图片说明

  • 请注意，这里最老的答案是正确的，但有严重错误

请注意，UIButton不幸的是，这UIView与iOS中的完全不同。

  • 由于iOS中的异常行为，您必须在初始化而不是layout中设置背景颜色（在这种情况下，当然必须是透明的）。您可以在情节提要中将其设置为清晰（但通常只需将其单击为纯色即可，以便在情节提要中工作时可以看到它。）

通常，阴影/舍入组合是iOS中的真正难题。类似的解决方案：

https://stackoverflow.com/a/57465440/294884-图像+圆角+阴影
https://stackoverflow.com/a/41553784/294884-两角问题
https://stackoverflow.com/a/59092828/294884 -“阴影+孔”或“发光盒”问题
https://stackoverflow.com/a/57400842/294884- “边界和间隙”问题
https://stackoverflow.com/a/57514286/294884-基本的“添加”贝济耶

— 胖子
source
-1

您可以创建一个协议并使它符合您的UIView，UIButton，Cell或类似您想要的任何东西：

protocol RoundedShadowable: class {
    var shadowLayer: CAShapeLayer? { get set }
    var layer: CALayer { get }
    var bounds: CGRect { get }
}
​
extension RoundedShadowable {
    func applyShadowOnce(withCornerRadius cornerRadius: CGFloat, andFillColor fillColor: UIColor) {
        if self.shadowLayer == nil {
            let 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: 0.0, height: 2.0)
            shadowLayer.shadowOpacity = 0.2
            shadowLayer.shadowRadius = 3
            self.layer.insertSublayer(shadowLayer, at: 0)
            self.shadowLayer = shadowLayer
        }
    }
}
​
class RoundShadowView: UIView, RoundedShadowable {

    var shadowLayer: CAShapeLayer?
    private let cornerRadius: CGFloat
    private let fillColor: UIColor

    init(cornerRadius: CGFloat, fillColor: UIColor) {
        self.cornerRadius = cornerRadius
        self.fillColor = fillColor
        super.init(frame: .zero)
    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override func layoutSubviews() {
        super.layoutSubviews()
        self.applyShadowOnce(withCornerRadius: self.cornerRadius, andFillColor: self.fillColor)
    }
}
​
class RoundShadowButton: UIButton, RoundedShadowable {

    var shadowLayer: CAShapeLayer?
    private let cornerRadius: CGFloat
    private let fillColor: UIColor

    init(cornerRadius: CGFloat, fillColor: UIColor) {
        self.cornerRadius = cornerRadius
        self.fillColor = fillColor
        super.init(frame: .zero)
    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override func layoutSubviews() {
        super.layoutSubviews()
        self.applyShadowOnce(withCornerRadius: self.cornerRadius, andFillColor: self.fillColor)
    }
}
— 亚当·斯马卡（Adam Smaka）
source
-1

使用CAShapeLayer和UIBezierPath，我们可以轻松地向UIView和从其派生的类（如UIButton，UIImageView，UILabel等）添加阴影和角半径。

我们将添加UIView Extension，这样做的好处是，您只需要编写一行代码即可实现此目的。

您也可以绕特定的角落。只需在项目中的UIView Extension下面添加：

 extension UIView {

  func addShadow(shadowColor: UIColor, offSet: CGSize, opacity: Float, shadowRadius: 
  CGFloat, cornerRadius: CGFloat, corners: UIRectCorner, fillColor: UIColor = .white) {

    let shadowLayer = CAShapeLayer()
    let size = CGSize(width: cornerRadius, height: cornerRadius)
    let cgPath = UIBezierPath(roundedRect: self.bounds, byRoundingCorners: corners, cornerRadii: size).cgPath //1
    shadowLayer.path = cgPath //2
    shadowLayer.fillColor = fillColor.cgColor //3
    shadowLayer.shadowColor = shadowColor.cgColor //4
    shadowLayer.shadowPath = cgPath
    shadowLayer.shadowOffset = offSet //5
    shadowLayer.shadowOpacity = opacity
    shadowLayer.shadowRadius = shadowRadius
    self.layer.addSublayer(shadowLayer)
  }
}

现在只需编写以下代码即可添加阴影和拐角半径

  self.myView.addShadow(shadowColor: .black, offSet: CGSize(width: 2.6, height: 2.6), 
  opacity: 0.8, shadowRadius: 5.0, cornerRadius: 20.0, corners: [.topRight, .topLeft], 
  fillColor: .red)
— Paresh Mangukiya
source
-1

暗角半径

简短的方法!!!!!

extension CALayer {
    func applyCornerRadiusShadow(
        color: UIColor = .black,
        alpha: Float = 0.5,
        x: CGFloat = 0,
        y: CGFloat = 2,
        blur: CGFloat = 4,
        spread: CGFloat = 0,
        cornerRadiusValue: CGFloat = 0)
    {
        cornerRadius = cornerRadiusValue
        shadowColor = color.cgColor
        shadowOpacity = alpha
        shadowOffset = CGSize(width: x, height: y)
        shadowRadius = blur / 2.0
        if spread == 0 {
            shadowPath = nil
        } else {
            let dx = -spread
            let rect = bounds.insetBy(dx: dx, dy: dx)
            shadowPath = UIBezierPath(rect: rect).cgPath
        }
    }

使用代码

btn.layer.applyCornerRadiusShadow(color: .black, 
                            alpha: 0.38, 
                            x: 0, y: 3, 
                            blur: 10, 
                            spread: 0, 
                            cornerRadiusValue: 24)

不需要maskToBound

请确认clipsToBounds为假。

输出值

在此处输入图片说明

— 潘卡·巴拉拉（Pankaj Bhalala）
source
感谢您提供的代码，但对我不起作用，为什么？请查看图片：imgur.com/dY5M3BL
— Mc.Lover
@ Mc.Lover您是否使用maskToBound？或clipsToBounds？
— Pankaj Bhalala
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