The Objective-C ViewController from my blog entry An iOS5 Ready Native Web App Template http://www.bitwit.ca/blog/an-ios5-ready-native-web-app-template/

ViewController.h

#import <UIKit/UIKit.h>
#import "WebViewController.h"

@interface ViewController : WebViewController

@end

ViewController.m

#import "ViewController.h"

@implementation ViewController

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
}

#pragma mark - View lifecycle
/* We are ready to load a page using our new webview functionality */
- (void)viewDidLoad
{
    [super viewDidLoad];

    [self loadPageFromFile:@"index.html"];
    //[self loadPageWithURL:@"http://www.google.ca"];
}

- (void)viewDidUnload
{
    [super viewDidUnload];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
        return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
    } else {
        return YES;
    }
}

@end