WKScriptMessageHandler 6.1升级- ViewController不再符合Xcode6.1协议

Question

我正在使用我的iOS应用程序中的WKScriptMessageHandler来接收来自Webkit的消息。我使用的是WKScriptMessageHandler协议，但显然在将Xcode升级到最新的6.1版本后，我现在收到以下错误消息：

Type 'ViewController' does not conform to protocol 'WKScriptMessageHandler'

现在该怎么做，有什么想法吗？苹果为什么要改变这一点

下面是我的代码：

import UIKit
import WebKit

class ViewController: UIViewController, WKScriptMessageHandler {

    @IBAction func fourButton(sender: UIButton){
        performSegueWithIdentifier("login", sender: self)
    }

    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.
    }

    func userContentController(userContentController: WKUserContentController!, didReceiveScriptMessage message: WKScriptMessage!){
        println("got message: \(message.body)")
    }

}

Answer 1

函数定义已更改，请删除感叹号：

func userContentController(userContentController: WKUserContentController, didReceiveScriptMessage message: WKScriptMessage)