Swift webview：如何从javascript中正确调用swift代码？ [英] Swift webview: How to call correctly swift code from javascript?
问题描述
我正在尝试让我的javascript与swift代码进行交互但不幸的是我没有成功。
I'm trying to make my javascript interact with swift code but unfortunately i didn't succeed.
目前，我只是尝试更改标题颜色并显示一条消息，就像您将在下面的代码中看到的那样。
For the moment, i just tried to change the headers colors and display a message like you will see in the code below.
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.
}
}
推荐答案
您已正确设置所有内容，但未将 WKWebViewConfiguration 实例提供给 WKWebView 。由于配置具有Javascript / Swift桥的详细信息，因此无法来回通话。
You have everything set up properly, but you aren't giving your WKWebViewConfiguration instance to the WKWebView. Since the configuration has the details of the Javascript/Swift bridge, you can't talk back and forth.
override func loadView() {
// ...
var config = WKWebViewConfiguration()
config.userContentController = contentController
self.webView = WKWebView(frame: self.view.frame, configuration: config)
self.view = self.webView!
}
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