是否可以创建具有弯曲底边的UIView。

class CurvedBottomView: UIView {
    override func draw(_ rect: CGRect) {
        let shapeLayer = CAShapeLayer()
        let path = UIBezierPath()
        
        // 绘制底边曲线
        path.move(to: CGPoint(x: 0, y: rect.height))
        path.addQuadCurve(to: CGPoint(x: rect.width, y: rect.height), controlPoint: CGPoint(x: rect.width / 2, y: rect.height - 50))
        path.addLine(to: CGPoint(x: rect.width, y: 0))
        path.addLine(to: CGPoint(x: 0, y: 0))
        path.close()
        
        shapeLayer.path = path.cgPath
        self.layer.mask = shapeLayer
    }
}

class CurvedBottomView: UIView {
    override class var layerClass: AnyClass {
        return CAGradientLayer.self
    }
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        
        let gradientLayer = self.layer as! CAGradientLayer
        gradientLayer.colors = [UIColor.red.cgColor, UIColor.blue.cgColor]
        gradientLayer.startPoint = CGPoint(x: 0, y: 0)
        gradientLayer.endPoint = CGPoint(x: 1, y: 0)
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}