Question

我需要在视图的左下角和右下角四舍五入，并根据我在Internet上在UIview扩展内创建此函数的结果：

func setRoundedCorner(withRadius radius: CGSize, forCorners corners: UIRectCorner ) {

    let viewShape = CAShapeLayer()
    viewShape.bounds = CGRect(x: self.frame.origin.x, y: self.frame.origin.y, width: self.bounds.width, height: self.bounds.height)
    viewShape.position = self.center
    viewShape.path = UIBezierPath(roundedRect: self.bounds, byRoundingCorners: corners, cornerRadii: radius).cgPath
    self.layer.mask = viewShape

}

现在，此解决方案遇到了两个问题；尽管它非常适合静态视图，但我的视图以编程方式更改其高度，导致视图被截断；我找到了解决该问题的解决方法，每次使用setRoundedCorner方法时都会想起，但是在我看来，这非常不舒服；还有其他解决方法吗？我很难解决的另一个问题是阴影设置。我通常使用这种方法：

func setShadow(height: CGFloat, width: CGFloat, opacity: Float, radius: CGFloat) {
    self.layer.shadowPath = UIBezierPath(roundedRect: self.bounds, cornerRadius: self.layer.cornerRadius).cgPath
    self.layer.shadowColor = UIColor.black.cgColor
    self.layer.shadowOpacity = opacity
    self.layer.shadowOffset = CGSize(width: width, height: height)
    self.layer.cornerRadius = radius
    self.layer.masksToBounds = false
}

相反，视图在其下应具有阴影时会以这种方式出现：

但是在这种情况下，似乎根本不显示任何阴影似乎不起作用。谁能给我一些建议？

Answer 1

在这里，我与您分享我的类别（添加边角半径）（使用BezierPath），同时支持添加阴影。

import UIKit

/// A category for all views.
extension UIView {
    /// Setups the layer of a view.
    public func setupLayer(
        cornerRadius: CGFloat = 22,
        borderWidth: CGFloat = 0,
        borderColor: UIColor = .clear,
        shadowOffSet: CGSize = CGSize(width: 0, height: 1),
        shadowColor: UIColor = UIColor(red:0, green:0, blue:0, alpha:0.15),
        shadowOpacity: Float = 1,
        shadowRadius: CGFloat = 2,
        shouldClipToBounds: Bool = false
        ) {

        self.layer.cornerRadius     = cornerRadius
        self.layer.borderWidth      = borderWidth
        self.layer.borderColor      = borderColor.cgColor
        self.layer.shadowOffset     = shadowOffSet
        self.layer.shadowColor      = shadowColor.cgColor
        self.layer.shadowOpacity    = shadowOpacity
        self.layer.shadowRadius     = shadowRadius
        self.clipsToBounds = shouldClipToBounds
    }

    /// Round the corner radius with bezier path.
    func roundCorners(_ corners: UIRectCorner, radius: CGFloat) {
        let path = UIBezierPath(roundedRect: self.bounds, byRoundingCorners: corners, cornerRadii: CGSize(width: radius, height: radius))
        let mask = CAShapeLayer()
        mask.path = path.cgPath
        self.layer.mask = mask
    }
}

随时编辑所有内容。现在，让我们谈谈您的问题。顺便说一下，我在生产项目中使用了此代码。有时，您需要在viewDidLayoutSubviews，viewWillLayoutSubviews中四舍五入。而且，如果您使用的是UIView或UITableViewCell或类似类的子类，则可以在其draw函数内添加圆角代码。

override func draw(_ rect: CGRect) {
        super.draw(rect)
    // Round corners here...
}

最后，为了设置图层，我通常在控件的惰性初始化声明（例如按钮，textFields ...）中调用它。知道使用bezierPath和简单的layer.cornerRadius添加角的区别。：）

我希望这会有所帮助！

Answer 2

您可以简单地添加此扩展名

extension UIView 
{ 
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
}

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
}


 }

添加上述扩展名后，您可以像以下使用

  priceview.layer.cornerRadius = 5
  priceview.dropShadow(color: UIColor.darkGray, opacity: 0.5, offSet: CGSize(width: 1, height: 1), radius: 3, scale: true)

希望它能对您有所帮助。

设置视图的圆角和阴影

2 个答案: