使用@IBInspectable Swift 4.2 在 UIView 上使用 CornerRadius 和 Shadow

Question

是否可以在 UIView 上同时具有 CornerRaduis 和阴影？

我为 UIView 设置了自定义 class，它使用 @IBInspectable 来设置 cornerRadius 和 addShadow 可以是 true 或 false。当我设置 cornerRadius 时，阴影不显示，如果我取消 cornerRadius，它会再次显示。提前致谢！

自定义 class:

import UIKit

class CustomUIView: UIView {

    override func awakeFromNib() {
        self.layer.masksToBounds = cornerRadius > 0
    }

    @IBInspectable var useDefaultRadius: Bool = true {
        didSet {
            self.layer.masksToBounds = cornerRadius > 0
        }
    }

    @IBInspectable var cornerRadius: CGFloat {
        set {
            self.layer.cornerRadius = newValue

        }
        get {
            if (useDefaultRadius) {
                    // Set default radius
                    self.layer.cornerRadius = 23
                }

            return self.layer.cornerRadius
        }
    }

    @IBInspectable var addShadow:Bool = true{

        didSet(newValue) {
            if(newValue == true){
                self.layer.masksToBounds = false
                self.layer.shadowColor = UIColor.black.cgColor
                self.layer.shadowOpacity = 0.5
                self.layer.shadowOffset = CGSize(width: 2, height: 3)
                self.layer.shadowRadius = 3

                self.layer.shadowPath = UIBezierPath(rect: bounds).cgPath
                self.layer.shouldRasterize = true
                self.layer.rasterizationScale =  UIScreen.main.scale
                print("trying to use shadow")
            }
        }

    }


}

Answer 1

在addShadow:Bool中设置truemasksToBounds或者不需要在addShadow:BooldidSet方法

中设置masksToBounds

@IBInspectable var addShadow:Bool = true{

        didSet(newValue) {
            if(newValue == true){
                //self.layer.masksToBounds = false
                self.layer.masksToBounds = true
                self.layer.shadowColor = UIColor.black.cgColor
                self.layer.shadowOpacity = 0.5
                self.layer.shadowOffset = CGSize(width: 2, height: 3)
                self.layer.shadowRadius = 3

                self.layer.shadowPath = UIBezierPath(rect: bounds).cgPath
                self.layer.shouldRasterize = true
                self.layer.rasterizationScale =  UIScreen.main.scale
                print("trying to use shadow")
            }
        }

    }

您可以关注：https://medium.com/bytes-of-bits/swift-tips-adding-rounded-corners-and-shadows-to-a-uiview-691f67b83e4a

https://spin.atomicobject.com/2017/07/18/swift-interface-builder/

Answer 2

与其创建自定义类并每次更改 class uiview，我更喜欢扩展它。我通过如下所述扩展 UIView 来实现此目的：

extension UIView {

    @IBInspectable
    var cornerRadius: CGFloat {
        get {
            return layer.cornerRadius
        }
        set {
            layer.cornerRadius = newValue
        }
    }

    @IBInspectable
    var borderWidth: CGFloat {
        get {
            return layer.borderWidth
        }
        set {
            layer.borderWidth = newValue
        }
    }

    @IBInspectable
    var borderColor: UIColor? {
        get {
            let color = UIColor.init(cgColor: layer.borderColor!)
            return color
        }
        set {
            layer.borderColor = newValue?.cgColor
        }
    }

    @IBInspectable
    var shadowRadius: CGFloat {
        get {
            return layer.shadowRadius
        }
        set {

            layer.shadowRadius = shadowRadius
        }
    }
    @IBInspectable
    var shadowOffset : CGSize{

        get{
            return layer.shadowOffset
        }set{

            layer.shadowOffset = newValue
        }
    }

    @IBInspectable
    var shadowColor : UIColor{
        get{
            return UIColor.init(cgColor: layer.shadowColor!)
        }
        set {
            layer.shadowColor = newValue.cgColor
        }
    }
    @IBInspectable
    var shadowOpacity : Float {

        get{
            return layer.shadowOpacity
        }
        set {

            layer.shadowOpacity = newValue

        }
    }        
}

并将情节提要中的属性设置为：

就是这样。

希望对您有所帮助。

Answer 3

诀窍在这里，您必须先将 true 设置为 masksToBounds，然后将 false 设置为 masksToBounds，然后再添加影子代码。你可以检查这个方法来弄清楚：

func addShadow(color: UIColor, bottomOrTop: Bool = false, radius: CGFloat = 2, height: CGFloat = 3) {
        // These below line makes the trick to draw shadow with corner radius
        self.layer.masksToBounds = true
        self.layer.masksToBounds = false
        self.layer.shadowOffset = CGSize(width: height, height:  bottomOrTop ? height : height * -1)
        self.layer.shadowRadius = radius
        self.layer.shadowColor = color.cgColor
        self.layer.shadowOpacity = 0.3
    }

使用@IBInspectable Swift 4.2 在 UIView 上使用 CornerRadius 和 Shadow

CornerRadius and Shadow on a UIView using @IBInspectable Swift 4.2

swift

ibinspectable