使用 JavaScript 的 UIWebView CSS 注入

问题描述

我正在尝试将本地 css 文件注入完成加载网站(如 google 等)的 UIWebView.

I'm trying to inject a local css file into an UIWebView that finished loading website such as google etc.

我正在尝试使用 JavaScript，但没有成功.

I'm trying with JavaScript but with no success.

- (void)webViewDidFinishLoad:(UIWebView *)webView {
    NSString *cssPath = [[NSString alloc] initWithString:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"styles.css"]];
    NSURL *baseURL = [NSURL fileURLWithPath:cssPath];

    NSString *js = [NSString stringWithFormat:@"var fileref = document.createElement('link');
                    fileref.setAttribute('rel', 'stylesheet');
                    fileref.setAttribute('type', 'text/css');
                    fileref.setAttribute('href', %@);", baseURL];

    [webView stringByEvaluatingJavaScriptFromString:js];
}

谢谢，

推荐答案

要将 javascript 注入 Web 视图，您必须在 html 中显式编写.

To inject javascript into a web view you must explicitly write in the html.

我在 javascript scrollTo 函数中写了一个例子:

An example of this is here where I wrote in a javascript scrollTo function:

- (void)webViewDidFinishLoad:(UIWebView *)webView {
 [webView stringByEvaluatingJavaScriptFromString:@"var script = document.createElement('script');"  
 "script.type = 'text/javascript';"  
 "script.text = "function myFunction() { "  
 "window.scrollTo(100,100)"
 "}";"  
 "document.getElementsByTagName('head')[0].appendChild(script);"];  

 [webView stringByEvaluatingJavaScriptFromString:@"myFunction();"];}

此代码将整个脚本标签和 myFunction 写入 HTML 的头部

This code writes the entire script tags and the myFunction into the head of the HTML

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