[英]How to return boolean to javascript function from swift using wkwebview
This is my function in android : 这是我在android中的功能:
@JavascriptInterface
public boolean GetMobileVersion() {
return true;
}
This is Calling function in JavaScript : 这是JavaScript中的Calling函数:
$(window).load(function () {
IsCallByMobileApp = false;
try {
IsCallByMobileApp = app.GetMobileVersion();/*Is call by android app*/
} catch (e) {
IsCallByMobileApp = false;
}
}
In iOS I am try to achieve same approach using WKWebView
like this but it's not working: 在iOS中,我尝试使用
WKWebView
这样的方法来实现相同的方法,但是它不起作用:
func userContentController(_ userContentController: WKUserContentController,
didReceive message: WKScriptMessage) {
if(message.name == callbackhandler) {
webView.evaluateJavaScript("GetMobileVersion();") { (true, error) in
guard error == nil else {
print("there was an error")
return
}
print(Bool(true))
}
}
}
Can anyone tell me How to send true
to Javascript function? 谁能告诉我如何向Javascript函数发送
true
? Please give me answer in detail because I am new to iOS and Swift. 请给我详细答案,因为我是iOS和Swift的新手。
Not sure if with WKWebView is the same as webview but you could try with plaintext as following: 不知道WKWebView是否与webview相同,但是您可以尝试使用纯文本,如下所示:
func userContentController(_ userContentController: WKUserContentController,
didReceive message: WKScriptMessage) {
if(message.name == callbackhandler) {
webView.evaluateJavaScript("GetMobileVersion(true);") { (true, error) in
guard error == nil else {
print("there was an error")
return
}
print(Bool(true))
}
}
} }
I have created a GitHub project for this.
我为此创建了一个GitHub项目。 https://github.com/BKRApps/WKWebView-JS .
https://github.com/BKRApps/WKWebView-JS 。 check it out for more details.
请查看更多详细信息。
Update the JavaScript: 更新JavaScript:
function getMobileVersion(){
webkit.messageHandlers.VersionHandler.postMessage({})
}
function receivedMobileVersion(mobileVersion){
//here you will be getting the mobile version. Then execute the logic.
// i have added this only to cross check the version. you don't need to add this.
if(mobileVersion === true) {
webkit.messageHandlers.VerifyHandler.postMessage({version:mobileVersion})
}
}
getMobileVersion()
Add the below code to WKWebView Configuration: 将以下代码添加到WKWebView配置中:
configuration.userContentController.add(self, name: "VersionHandler")
// i have added this only to cross check the version. you don't need to add this.
configuration.userContentController.add(self, name: "VerifyHandler")
Update the WKScriptMessageHandler delegate: 更新WKScriptMessageHandler委托:
func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {
switch message.name {
case "VersionHandler":
let mobileVersion = true //write the version logic and send the true or false.
let sendMobileVersionScript = "receivedMobileVersion(\(mobileVersion))"
self.wkWebView?.evaluateJavaScript("\(sendMobileVersionScript)", completionHandler: { (any, error) in
print("hello")
})
case "VerifyHandler":
print(message.body) // i have added this only to cross check the version. you
default:
break;
}
}
for more info : http://igomobile.de/2017/03/06/wkwebview-return-a-value-from-native-code-to-javascript/ 有关更多信息: http : //igomobile.de/2017/03/06/wkwebview-return-a-value-from-native-code-to-javascript/
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