Question

I am looking to find out if a web page has changed, I was going to use the content length of the web page but have not seen a way to do so. Any ideas? Or can anyone think of another way to check periodically if a web page has changed?

Answer 1

If you mean with changed wether navigation has occured, you could use a custom UIWebViewDelegate and set a flag when e.g. -(void)webViewDidFinishLoad: occured.

You might want to check UIWebViews property request to check wether the URL actually differs.

If you want to check wether the content has changed you could retrieve it e.g. like this:

NSString* script  = @"document.body.innerHTML";
NSString* content = [webView stringByEvaluatingJavaScriptFromString:script];

Or retrieve the length e.g. like this:

NSString* script = @"document.body.innerHTML.length";
int length = [[webView stringByEvaluatingJavaScriptFromString:script] integerValue];