uiwebview和js交互

NSString *jsCode = @"document.getElementById('someElement').innerHTML;";
NSString *result = [webView stringByEvaluatingJavaScriptFromString:jsCode];
NSLog(@"Result from JS: %@", result);

WKWebViewConfiguration *configuration = [[WKWebViewConfiguration alloc] init];
WKUserContentController *userContentController = [[WKUserContentController alloc] init];
[userContentController addScriptMessageHandler:self name:@"nativeHandler"];
configuration.userContentController = userContentController;
WKWebView *webView = [[WKWebView alloc] initWithFrame:self.view.frame configuration:configuration];
[self.view addSubview:webView];

- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message {
    if ([message.name isEqualToString:@"nativeHandler"]) {
        NSLog(@"Received message from JS: %@", message.body);
        // 处理从JS发送过来的消息
    }
}

window.webkit.messageHandlers.nativeHandler.postMessage("Hello from JS!");