WKUserScript不起作用

WKUserScript not working

本文关键字：不起作用 WKUserScript      更新时间：2023-09-26

我想使用WKWebview API注入一个脚本。由于某种原因，它不起作用，我想不通。我试过在Safari开发人员控制台中调试，但在那里也找不到JavaScript代码。

实现代码如下：

NSString *js = @"document.body.style.background = '"#FF0000'";";
    NSString *myScriptSource = @"alert('Hello, World!')";

    WKUserScript *s = [[WKUserScript alloc] initWithSource:myScriptSource injectionTime:WKUserScriptInjectionTimeAtDocumentStart forMainFrameOnly:YES];
    WKUserContentController *c = [[WKUserContentController alloc] init];
    [c addUserScript:s];
    WKWebViewConfiguration *conf = [[WKWebViewConfiguration alloc] init];
    conf.userContentController = c;
    WKWebView *webview = [[WKWebView alloc] initWithFrame:self.view.bounds configuration:conf];
    [self.view addSubview:webview];
    webview.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
    // Do any additional setup after loading the view, typically from a nib.
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://google.com"]];
        [webview loadRequest:request];
    });

alert默认情况下不会在WKWebView中实现，因此即使您的用户脚本运行，它也不会明显执行任何操作。您需要实现runJavaScriptAlertPanelWithMessage:

func webView(_ webView: WKWebView, runJavaScriptAlertPanelWithMessage message: String, initiatedByFrame frame: WKFrameInfo, completionHandler: @escaping (() -> Void)) {
  let alert = UIAlertController.create(title: frame.request.url?.host, message: message, preferredStyle: .alert)
  alert.addAction(UIAlertAction(title: "OK", style: .default, handler: { action in
    completionHandler()
  }))
  present(alert, animated: true, completion: nil)
}

我不认为注入的JavaScript实际上出现在DOM的任何地方，它是WKWebView内部的属性。

请使用这样的代码，添加脚本消息处理程序并设置导航委托

NSString *js = @"document.body.style.background = '"#FF0000'";";
NSString *myScriptSource = @"alert('Hello, World!')";

WKUserScript *s = [[WKUserScript alloc] initWithSource:myScriptSource injectionTime:WKUserScriptInjectionTimeAtDocumentStart forMainFrameOnly:YES];
WKUserContentController *c = [[WKUserContentController alloc] init];
[c addUserScript:s];
// Add a script message handler for receiving  "buttonClicked" event notifications posted from the JS document using window.webkit.messageHandlers.buttonClicked.postMessage script message
    [c addScriptMessageHandler:self name:@"buttonClicked"];
WKWebViewConfiguration *conf = [[WKWebViewConfiguration alloc] init];
conf.userContentController = c;
WKWebView *webview = [[WKWebView alloc] initWithFrame:self.view.bounds configuration:conf];
[self.view addSubview:webview];
webview.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
// Do any additional setup after loading the view, typically from a nib.
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://google.com"]];
    [webview loadRequest:request];
});

实现方法名为的脚本消息处理程序"WKScriptMessageHandler"

#pragma mark -WKScriptMessageHandler
- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message {
if ([message.name isEqualToString:@"buttonClicked"]) {
    self.buttonClicked ++;
}
// JS objects are automatically mapped to ObjC objects
id messageBody = message.body;
if ([messageBody isKindOfClass:[NSDictionary class]]) {
    NSString* idOfTappedButton = messageBody[@"ButtonId"];
    [self updateColorOfButtonWithId:idOfTappedButton];
}

}

并像这个一样发布消息表单js

var button = document.getElementById("clickMeButton");
button.addEventListener("click", function() {
        var messgeToPost = {'ButtonId':'clickMeButton'};
        window.webkit.messageHandlers.buttonClicked.postMessage(messgeToPost);
    },false);

您将收到一个回电

相关文章：