class SearchTextField: UITextField {

    override func awakeFromNib() {
        super.awakeFromNib()

        // left view
        leftViewMode = .always
        let imageView = UIImageView(image: UIImage(named: "sousuo"))
        leftView = imageView

        // 圆角
        layer.cornerRadius = 15
        layer.masksToBounds = true
    }

    // 图片距离左边的距离
    override func leftViewRect(forBounds bounds: CGRect) -> CGRect {
        var rect = super.leftViewRect(forBounds: bounds)
        rect.origin.x += 13
        return rect
    }

    // 文本距离左边框的距离
    override func textRect(forBounds bounds: CGRect) -> CGRect {
        return bounds.insetBy(dx: 39, dy: 0)
    }

}