按钮的圆角半径和阴影问题

问题描述 投票：0回答：15

我正在尝试创建一个带有 圆角 和 投影 的按钮。无论我如何切换，该按钮都无法正确显示。我尝试过 

masksToBounds = false
和 
masksToBounds = true
，但要么是圆角半径起作用而阴影不起作用，要么是阴影起作用而圆角半径不会剪切按钮的角。

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 uibutton shadow cornerradius
15个回答
172
投票

以下 Swift 5 / iOS 12 代码显示了如何设置 

UIButton
的子类，该子类允许创建带有圆角和周围阴影的实例：

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，您可以在 Storyboard 中添加 

UIButton
并将其类设置为 
CustomButton
，或者您可以通过编程方式创建 
CustomButton
的实例。以下 
UIViewController
实现展示了如何以编程方式创建和使用 
CustomButton
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 模拟器中生成下面的图像：

48
投票

我的自定义按钮带有一些阴影和圆角，我直接在

Storyboard
中使用它，无需以编程方式触摸它。

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
    }
}

18
投票

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)
    }
}
15
投票

获得更可用且一致的按钮的另一种方法。

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
13
投票

斯威夫特 5 & 不需要“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
4
投票

重构了this以支持任何视图。从此视图子类化，它应该有圆角。如果您将 UIVisualEffectView 之类的内容添加为该视图的子视图，您可能需要在该 UIVisualEffectView 上使用相同的圆角，否则它将不会有圆角。

/// 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)
        }
    }
}
3
投票

2020语法精确解

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
        layer.insertSublayer(colorAndShadow, 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.frame = bounds
        colorAndShadow.path = UIBezierPath(roundedRect: bounds, cornerRadius: 12).cgPath
    }
}

  • 请注意，这里非常旧的最佳答案是正确的，但有一个严重错误

请注意，不幸的是，
UIButton
与 iOS 中的 
UIView
有很大不同。

  • 由于 iOS 中的奇怪行为，您必须在初始化中设置背景颜色（在这种情况下当然必须清晰），而不是在布局中。您可以在故事板中将其设置为清晰（但您通常将其单击为某种纯色，以便您在故事板中工作时可以看到它。）
总的来说，阴影/舍入的组合在 iOS 中是一个真正的痛苦。类似解决方案：

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+洞”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“添加”贝塞尔曲线

3
投票

带阴影的圆角半径

简短而简单的方法！！！！！！

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 } } } 
代码的使用


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



无需 maskToBound




请验证 ClipsToBounds 是否为 false。


输出


    



      

      
      
      

      

        

          

            

              
2
投票

              
            

          

        

        
为了改进 PiterPan 的答案并在 Swift 3 中使用圆形按钮显示真实的阴影（不仅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)
}

    



      

      
      
      

      

        

          

            

              
0
投票

              
            

          

        

        
扩展阴影和圆角半径



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)
}

}

    



      

      
      
      

      

        

          

            

              
0
投票

              
            

          

        

        
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，应用带有角半径的阴影，如下所示：



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




结果图






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


DispatchQueue.main.async {
    viewRounded.applyShadowWithCornerRadius(color: .gray, opacity: 1, radius: 15, edge: AIEdge.All, shadowSpace: 15)
}

    



      

      
      
      

      

        

          

            

              
0
投票

              
            

          

        

        
UIButton 扩展


许多人建议使用 
UIButton
 的自定义类，这完全没问题。万一你像我一样想要延期，这里有一个。 
用 Swift 5 编写。

extension UIButton {
    /// Adds a shadow to the button, with a corner radius
    /// - Parameters:
    ///   - corner: The corner radius to apply to the shadow and button
    ///   - color: The color of the shaodw
    ///   - opacity: The opacity of the shadow
    ///   - offset: The offset of the shadow
    ///   - radius: The radius of the shadow
    func addShadow(corner: CGFloat = 20, color: UIColor = .black, opacity: Float = 0.3, offset: CGSize = CGSize(width: 0, height: 5), radius: CGFloat = 5) {
        let shadowLayer = CAShapeLayer()
        layer.cornerRadius = corner
        shadowLayer.path = UIBezierPath(roundedRect: bounds, cornerRadius: corner).cgPath
        shadowLayer.fillColor = UIColor.clear.cgColor
        shadowLayer.shadowColor = color.cgColor
        shadowLayer.shadowPath = shadowLayer.path
        shadowLayer.shadowOffset = offset
        shadowLayer.shadowOpacity = opacity
        shadowLayer.shadowRadius = radius
        
        layer.insertSublayer(shadowLayer, at: 0)
    }
}

    



      

      
      
      

      

        

          

            

              
0
投票

              
            

          

        

        
对于那些正在搜索带有阴影的圆形图像的人，您可以使用新的

填充按钮与胶囊cornerStyle并应用阴影与代码之后，您也可以尝试使用菜单中不同的cornerStyle尺寸：

    backButton.layer.shadowOpacity = 1.0
    backButton.layer.shadowOffset = CGSize(width: 1, height: 1)
    backButton.layer.shadowColor = UIColor.black.cgColor
    backButton.layer.masksToBounds = false




    



      

      
      
      

      

        

          

            

              
-1
投票

              
            

          

        

        
如果有人需要在 Swift 3.0 中为
rounded按钮添加阴影，这里是一个很好的方法。


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()
中使用此方法如下：



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



该方法的效果是：


    



      

      
      
      

      

        

          

            

              
-1
投票

              
            

          

        

        
您可以创建一个协议并使其符合您的 UIView、UIButton、Cell 或任何您想要的内容：



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)
    }
}

    



      

      
    

  

  

    
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