Ios 如何设置Kanna来解析xPath？

下面是我的视图控制器代码的样子，我不明白为什么会出现错误。在此方面的任何帮助都将不胜感激！谢谢

    import UIKit
    import Kanna


    let url = NSURL (string: "my website")
    let data = NSData (contentsOfURL: url!)
    let doc = HTML (html: data !, encoding: NSUTF8StringEncoding)

    let doc = Kanna.HTML(url: (NSURL(string: "the_site_url")!),     encoding: NSUTF8StringEncoding) {


// Search for nodes by XPath
for link in doc.xpath("//*[@id="hp-content"]/div[3]") {
    print(link.text)
    print(link["href"])
   }
}


class ViewController: UIViewController {


override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
 ] }


}

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为什么你的代码在UIViewController之外？我刚刚做了一个新的测试项目，所以所有东西都是默认的。你找到解决方案了吗？