How to cache content in UIWebView for faster loading later on?

Question

I notice that the iphone safari caches content so that your page load for later is much faster much like a desktop browser. So take mobile gmail web page for example, the first load is quite slow (5-10 secondS). But if I close the tab and reopen the page again, it's very quick (1 second).

However, this behavior is not the same if you load the content through a UIWebView in your app. Am I missing some settings? How do I make the UIWebView cache the content automatically without going through the hassle of saving the content myself?

Answer 1

The key is: NSURLRequestReturnCacheDataElseLoad

NSData *urlData; NSString *baseURLString =  @"mysite.com"; NSString *urlString = [baseURLString stringByAppendingPathComponent:@"myfile"];  NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:urlString] cachePolicy:NSURLRequestReturnCacheDataElseLoad timeoutInterval: 10.0];  NSURLConnection *connection=[[NSURLConnection alloc] initWithRequest:request delegate:nil];   if (connection) {      urlData = [NSURLConnection sendSynchronousRequest: request];      NSString *htmlString = [[NSString alloc] initWithData:urlData encoding:NSUTF8StringEncoding];     [webView loadHTMLString:htmlString baseURL:baseURLString];     [htmlString release]; }  [connection release]; 

Answer 2

NSString *stringurl=[NSString stringWithFormat:@"http://www.google.com"]; NSURL *url=[NSURL URLWithString:stringurl]; NSMutableURLRequest *theRequest = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestReturnCacheDataElseLoad timeoutInterval:15.0]; [uiwebview loadRequest:theRequest]; 

It will load a url first time then looks for for only the content changes..,if there is no updates in the url content it will load from the cache(local storage).