问带渐变的CoreGraphice描边文本

EN

class CustomV: UIView{
     override func draw(_ rect: CGRect) {
       
        // Create a gradient from white to red
        let colors: [CGFloat] = [
            1.0, 1.0, 1.0, 1.0,
            1.0, 0.0, 0.0, 1.0]
        let baseSpace = CGColorSpaceCreateDeviceRGB()
        guard let context = UIGraphicsGetCurrentContext(), let gradient =
                CGGradient(colorSpace: baseSpace, colorComponents: colors, locations: nil, count: 2) else{ return }
        
        context.saveGState()
        let offset: CGFloat = 10
        let startPoint = CGPoint(x: rect.maxX - offset, y: rect.minY)
        let endPoint = CGPoint(x: rect.maxX - offset, y: rect.maxY)
        let p = CGMutablePath()
        p.move(to: startPoint)
        p.addLine(to: endPoint)
        context.addPath(p)
        context.clip(to: CGRect(origin: startPoint, size: CGSize(width: 3, height: 800)))
        context.setLineWidth(offset)
        
        context.drawLinearGradient(gradient, start: startPoint, end: endPoint, options: [])
        context.restoreGState()

    }
}