ios - Xcode 6.1 升级 - ViewController 不再符合 WKScriptMessageHandler 协议(protocol)

Question

我在我的 iOS 应用程序中使用 WKScriptMessageHandler 来接收来自 Webkit 的消息。我正在使用 WKScriptMessageHandler 协议(protocol)，但显然在将 Xcode 升级到最新的 6.1 升级后，我现在收到此错误消息:

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

关于现在应该如何完成的任何想法？为什么苹果要改变这个

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，删除感叹号:

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