注入JavaScript到UIWebView [英] Injecting JavaScript into UIWebView

问题描述

我试图使用 stringByEvaluatingJavaScriptFromString：来修改一个WebView，它没有按预期执行。

I am trying to use the stringByEvaluatingJavaScriptFromString: to alter a WebView and it's not executing as I expect.

这里是代码，这个JS不执行。任何想法为什么？

Here is the code, this JS doesn't execute though. Any idea why?

UIWebView *wv = [UIWebView alloc] init];

NSURL *url = [[NSURL alloc] initWithString:@"http://www.google.com"];

NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];

[wv loadRequest:request];

[wv stringByEvaluatingJavaScriptFromString:@"document.write('This Works')"];

推荐答案

可能需要等待请求完成后，您可以使用 stringByEvaluatingJavaScriptFromString 。设置 wv.delegate = self; 然后实现 -webViewDidFinishLoad 像这样

Probably you'll have to wait for the request to finish before you can use stringByEvaluatingJavaScriptFromString. Set wv.delegate = self; and then implement -webViewDidFinishLoad like this

-(void)webViewDidFinishLoad:(UIWebView *)webView {
    [webView stringByEvaluatingJavaScriptFromString:@"document.write('This Works')"];
}

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