创建一个带有圆形底边的 UIView答案

【问题标题】：Create a UIView with rounded bottom edge创建一个带有圆形底边的 UIView
【发布时间】：2019-09-09 17:57:27
【问题描述】：

【问题讨论】：

【解决方案1】：

我认为这真的很接近你想要的：

rectView 是您的初始视图；您可以使用四边形曲线高度的 + 50 来调整曲线

let rectView = UIView(frame: CGRect(x: 50, y: 100, width: 200, height: 200))
    rectView.backgroundColor = .red
    view.addSubview(rectView)

    let arcBezierPath = UIBezierPath()
    arcBezierPath.move(to: CGPoint(x: 0, y: rectView.frame.height))
    arcBezierPath.addQuadCurve(to: CGPoint(x: rectView.frame.width, y: rectView.frame.height), controlPoint: CGPoint(x: rectView.frame.width / 2 , y: rectView.frame.height + 50 ))
    arcBezierPath.close()

    let shapeLayer = CAShapeLayer()

    shapeLayer.path = arcBezierPath.cgPath

    shapeLayer.fillColor = UIColor.red.cgColor

    rectView.layer.insertSublayer(shapeLayer, at: 0)
    rectView.layer.maskedCorners = [.layerMinXMinYCorner, .layerMaxXMinYCorner]
    rectView.layer.cornerRadius = 10
    rectView.layer.shadowRadius = 3
    rectView.layer.shadowColor = UIColor.black.cgColor
    rectView.layer.shadowOffset = CGSize(width: 0, height: 0)
    rectView.layer.shadowOpacity = 0.25

也许，更好：您可以创建自己的视图：

let rectView = UIView(frame: CGRect(x: 50, y: 100, width: 200, height: 200))
view.addSubview(rectView)

扩展 UIView

extension UIView {
    func addBottomArc(ofHeight height: CGFloat, topCornerRadius: CGFloat) {
       let arcBezierPath = UIBezierPath()
       arcBezierPath.move(to: CGPoint(x: 0, y: frame.height))
       arcBezierPath.addQuadCurve(to: CGPoint(x: frame.width, y: frame.height), controlPoint: CGPoint(x: frame.width / 2 , y: frame.height + height ))
       arcBezierPath.close()

       let shapeLayer = CAShapeLayer()

       shapeLayer.path = arcBezierPath.cgPath
       shapeLayer.fillColor = UIColor.red.cgColor

       layer.insertSublayer(shapeLayer, at: 0)
       layer.maskedCorners = [.layerMinXMinYCorner, .layerMaxXMinYCorner]
       layer.cornerRadius = topCornerRadius
    }
}

所以你可以像这样设置高度和圆角半径：

rectView.addBottomArc(ofHeight: 50, topCornerRadius: 15)

然后将您需要的阴影添加到您的视图中：

    rectView.layer.shadowRadius = 3
    rectView.layer.shadowColor = UIColor.black.cgColor
    rectView.layer.shadowOffset = CGSize(width: 0, height: 0)
    rectView.layer.shadowOpacity = 0.25

【讨论】：