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

NSURLRequest *request = [NSURLRequest requestWithURL:url];
[webview loadRequest:request];

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

NSURLRequest *request = [NSURLRequest requestWithURL:url];
[webview loadRequest:request];

@interface YourController : UIViewController <UIWebViewDelegate>

self.yourWebView.delegate = self;

- (void)webViewDidFinishLoad:(UIWebView *)webView {
    // Do whatever you want here
    }

// If ARC is used
- (void)dealloc {
    [_webView setDelegate:nil];
    [_webView stopLoading];
}

// If ARC is not used
- (void)dealloc {
    [webView setDelegate:nil];
    [webView stopLoading];
    [webView release];
    [super dealloc];
}

// ARC - Before iOS6 as its deprecated from it.
- (void)viewWillUnload {
    [webView setDelegate:nil];
    [webView stopLoading];
}