脚本消息处理程序不起作用

Question

我试图注入一个自定义WebKit脚本消息处理程序.我的控制器已正确加载和视图.但是,在JS端(来自Safari控制台),window.webkit.messageHandlers是空的.知道为什么吗？我的应用程序使用的是iOS 8.1,但即使升级到9.2,也无效.

import Foundation
import UIKit
import WebKit

public class FooController: UIViewController, WKScriptMessageHandler {
    private var wkWebView: WKWebView?

    public override func viewDidLoad() {
        super.viewDidLoad()

        let o = WKUserContentController()
        o.addScriptMessageHandler(self, name: "foo")
        let config = WKWebViewConfiguration()
        config.userContentController = o

        self.wkWebView = WKWebView(frame: self.view.bounds, configuration: config)
        self.view.addSubview(self.wkWebView!)

        self.wkWebView!.loadRequest(NSURLRequest(URL: NSBundle.mainBundle().URLForResource("foo", withExtension: "html")!))
    }

    public func userContentController(userContentController: WKUserContentController, didReceiveScriptMessage message: WKScriptMessage) {
        print("foo")
    }
}

Answer 1

webkit.messageHandlers不是数组.这是一个UserMessageHandlersNamespace.

尝试

var message = {"key1":"value1", "key2":"value2", "dictionary": {"name": "foo"}}
webkit.messageHandlers.foo.postMessage(message);

在您的消息处理程序中

public func userContentController(userContentController: WKUserContentController, didReceiveScriptMessage message: WKScriptMessage) {
    let body = message.body
    if let dict = body as? Dictionary<String, AnyObject> {
        print(dict)
    }
}