uiweb实现缓存

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

    

    NSURLCache *urlCache = [NSURLCache sharedURLCache];

    

    [urlCache setMemoryCapacity:1*1024*1024];

    

    NSMutableURLRequest *urlRequest=[NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadRevalidatingCacheData timeoutInterval:60.0];

    

    NSCachedURLResponse *response=[urlCache cachedResponseForRequest:urlRequest];

    

    UIWebView *web = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];

    

    if (response !=nil ) {

        [urlRequest setCachePolicy:NSURLRequestReturnCacheDataDontLoad];

    }else

    {

        

    }

    

    [web loadRequest:urlRequest];

    

    [self.view addSubview:web];