Swift Webview：如何从JavaScript正确调用Swift代码？

小编典典

Swift Webview：如何从JavaScript正确调用Swift代码？

swift

我正在尝试使我的javascript与快速代码交互，但不幸的是我没有成功。

目前，我只是尝试更改标题的颜色并显示一条消息，如下面的代码所示。

这是我的（ index.html ）代码：

<!DOCTYPE html>
<html>
    <head>
        <title>Test</title>
        <meta charset="UTF-8">
    </head>
    <body>
        <h1>WebView Test</h1>
        <script type="text/javascript" src="main.js"></script>
    </body>
</html>

这是我的（ main.js -JavaScript ）代码：

function callNativeApp () {
    try {
        webkit.messageHandlers.callbackHandler.postMessage("Send from JavaScript");
    } catch(err) {
        console.log('error');
    }
}

setTimeout(function () {
    callNativeApp();
}, 5000);

function redHeader() {
    document.querySelector('h1').style.color = "red";
}

这是我的（ ViewController.swift ）代码：

import UIKit
import WebKit

class ViewController: UIViewController, WKScriptMessageHandler {

    @IBOutlet var containerView : UIView! = nil

    var webView: WKWebView?

    override func loadView() {
        super.loadView()

        var contentController = WKUserContentController();
        var userScript = WKUserScript(
            source: "redHeader()",
            injectionTime: WKUserScriptInjectionTime.AtDocumentEnd,
            forMainFrameOnly: true
        )
        contentController.addUserScript(userScript)
        contentController.addScriptMessageHandler(
            self,
            name: "callbackHandler"
        )

        var config = WKWebViewConfiguration()
        config.userContentController = contentController

        self.webView = WKWebView()
        self.view = self.webView!
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        var url = NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("index", ofType: "html")!)
        var req = NSURLRequest(URL: url)
        self.webView!.loadRequest(req)
    }

    func userContentController(userContentController: WKUserContentController!,didReceiveScriptMessage message: WKScriptMessage!) {
            if(message.name == "callbackHandler") {
            println("JavaScript is sending a message \(message.body)")
            } }

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


}

阅读 301

2020-07-07

共1个答案

小编典典

您已正确设置了所有内容，但没有将WKWebViewConfiguration实例分配给WKWebView。由于配置包含Javascript /
Swift桥的详细信息，因此您无法来回交谈。

override func loadView() {
    // ...
    var config = WKWebViewConfiguration()
    config.userContentController = contentController

    self.webView = WKWebView(frame: self.view.frame, configuration: config)
    self.view = self.webView!
}

2020-07-07