Progress bar in UIWebView - ios

Question

How to determine progress in UIWebView?
Few Observations:
1. To determine the progress of downloaded content, we need to make a NSURLConnection object and fetch data twice: one with the UIWebView and the other with NSURLConnection
2. If we just fetch data once using NSURLConnection and load the webview with that data text/html then that data renders poorly
Difficulties:
a) As fetching data twice can largely slow down the process, is it feasible (appstore safe?) to use private api's like the one given here: https://github.com/petr-inmite/imtwebview
b) If we cannot, then how we may display a progress bar?
c) Also will downloading the data asynchronously using NSURLConnection mirror the progress of UIWebView loading? How bad the performance of fetching data twice would be?
There are some browsers like safari, dolphin which are displaying progress bar...any ideas on how to do this???

Answer 1

Use the UIWebView delegates for it.First set your webview's delegate to be self and then utilize these methods.Prior to this create and add a spinner to the view which shall indicate the progress of uiwebview e.g UIActivityIndicatorView *spinner
- (void)webViewDidStartLoad:(UIWebView *)localWebView {
[ spinner performSelectorInBackground: #selector(startAnimating) withObject: nil];
}
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error {
[ spinner performSelectorInBackground: #selector(stopAnimating) withObject: nil];
}
- (void)webViewDidFinishLoad:(UIWebView *)localWebView {
[ spinner performSelectorInBackground: #selector(stopAnimating) withObject: nil];
}