Inject a local javascript into UIWebView

Question

Is there a way to inject a local JS file or a JS file that's store on my server into any web page loaded by UIWebView?

Say I navigate to google.com in that UIWebView, it renders that page and also runs my JS file (local or on my webserver)?

Answer 1

The following code will inject javascript locally

- (void)injectJavascript:(NSString *)resource {
    NSString *jsPath = [[NSBundle mainBundle] pathForResource:resource ofType:@"js"];
    NSString *js = [NSString stringWithContentsOfFile:jsPath encoding:NSUTF8StringEncoding error:NULL];

    [self.webView stringByEvaluatingJavaScriptFromString:js];
}

Just pass in the name of the file before the js, eg.

[self injectJavascript:@"script"];

To do inject javascript from your server you can download it first and load it into the web view in a similar manner.