设置CAGradientLayer框架等于视图

Question

我有一个roundView和上面有渐变的图层，但是大小不同

func layerGradient(view: UIView) {
    let layer : CAGradientLayer = CAGradientLayer()
    layer.startPoint = CGPoint(x: 0.0, y: 0.5)
    layer.endPoint = CGPoint(x: 1.0, y: 0.5)
    layer.cornerRadius = frame.height / 2
    layer.frame = self.bounds
    let leftColor =  UIColor(red: 221.0/255.0, green: 214.0/255.0, blue: 243.0/255.0, alpha: 1.0).cgColor
    let rightColor = UIColor(red: 250.0/255.0, green: 172.0/255.0, blue: 168.0/255.0, alpha: 1.0).cgColor
    layer.colors = [leftColor,rightColor]
    self.layer.insertSublayer(layer, at: 0)
}