Question

我想从java脚本代码调用一个swift函数，它将device id返回给脚本，我添加了当前使用的代码。请告知如何从swift函数返回值java script，提前致谢

代码段：

     super.viewDidLoad()
    {
    self.webView = WKWebView()
    let preferences = WKPreferences()
    preferences.javaScriptEnabled = true
    let configuration = WKWebViewConfiguration()
    configuration.preferences = preferences
    configuration.userContentController = contentController
    configuration.userContentController.addScriptMessageHandler(self,name: "interOp")
    self.webView = WKWebView(frame: self.view.frame, configuration: configuration)
    print(self.view.frame)
    self.view = self.webView
    webView!.navigationDelegate = self
    let url = NSURL(string:"http://softence.com/devTest/vb_ios.html")
    let req = NSURLRequest(URL:url!)
    self.webView!.loadRequest(req)

    }

// did receivescript message is working fine
func userContentController(userContentController: WKUserContentController, didReceiveScriptMessage message: WKScriptMessage)
{
    let sentData = message.body as! NSDictionary
    print(sentData)
    if sentData["name"] as! String == "DeviceInfo"
    {
        self.DeviceInfo()
    }
}
// i want to return the following device info to javascript
func DeviceInfo() -> String
{
let dict = NSMutableDictionary()
    dict.setValue(UIDevice.currentDevice().model, forKey: "model")
    dict.setValue(UIDevice.currentDevice().name, forKey: "name")
    dict.setValue(UIDevice.currentDevice().systemVersion, forKey: "system_version")
    return String(dict)
}

Answer 1

按照here

的说明，试着查看evaluateJavaScript(_:, completionHandler:)上的WKWebView功能

要使用它，您的DeviceInfo函数应定义您要执行的完整JavaScript字符串。

例如，如果你有一个像这样定义的JavaScript函数：

showDeviceInfo(model, name, system_version) {

}

然后你的DeviceInfo函数看起来像这样：

func deviceInfo() {
    let model = UIDevice.currentDevice().model
    let name = UIDevice.currentDevice().name
    let systemVersion = UIDevice.currentDevice().systemVersion

    let javaScriptString = "showDeviceInfo(\(model), \(name), \(systemVersion));" //string your JavaScript string together from the previous info...and no...it aint pretty :)
    webView.evaluateJavaScript(javaScriptString, completionHandler: nil)
}

您还可以从javaScriptString函数返回DeviceInfo，然后在userContentController(userContentController: WKUserContentController, didReceiveScriptMessage message: WKScriptMessage)中调用它，重要的是：

您需要定义要执行的整个JavaScript字符串
您需要致电evaluateJavaScript

希望对你有所帮助。

从使用wk webview返回值的java脚本调用swift函数

1 个答案: