在本地safari应用程序扩展中，我们如何调用javascript函数？

Question

我只想在safari应用程序扩展名中调用一个快速文件中的javascript函数，我经常打结。我是新来的，我不知道该怎么做，请帮帮我：

import SafariServices
import JavaScriptCore
import WebKit
class SafariExtensionHandler: SFSafariExtensionHandler,WKNavigationDelegate {

    override func messageReceived(withName messageName: String, from page: SFSafariPage, userInfo: [String : Any]?) {
        // This method will be called when a content script provided by your extension calls safari.extension.dispatchMessage("message").

        SFSafariApplication.getActiveWindow { (window) in
            window?.getActiveTab { (tab) in
                tab?.getActivePage(completionHandler: { (page1) in
                    page1?.webFrame.javaScriptContext.evaluateScript("myFunction('123')");
                })
            }
        }
    }
}

我正在犯错误：

SFSafariPage webFrame:发送到实例的未识别选择器

Answer 1

我认为在苹果文档中描述它的方式是使用主类调用文件中的dispatchMessageToScript函数，也就是SafariExtensionHandler类，并在javascript文件上设置一个侦听器来侦听发送的消息并根据消息对其进行操作。

因此，带有主类的文件(在我的例子中是SafariExtensionHandler.swift)将如下所示。

import SafariServices

class SafariExtensionHandler: SFSafariExtensionHandler {

    override func messageReceived(withName messageName: String, from page: SFSafariPage, userInfo: [String : Any]?) {
        // This method will be called when a content script provided by your extension calls safari.extension.dispatchMessage("message").
        if messageName == "GetWebsiteUrl" {
            page.dispatchMessageToScript(withName: "WebsiteUrl")
        }
    }
}

你要注入的javascript文件看起来会像这样。

// Wait for the DOM to load before dispatching a message to the app extension's Swift code.
document.addEventListener("DOMContentLoaded", function(event) {
    safari.extension.dispatchMessage("GetWebsiteUrl");
});

// Listens for messages sent from the app extension's Swift code.
safari.self.addEventListener("message", messageHandler);

function messageHandler(event) {
    if(event.name === "WebsiteUrl"){
        console.log("WebsiteUrl >>>", document.URL)
    }
}