How the iphone empties the UIWebView cache

Iphonecachingapplicationcookiescacheperformance

I actually think it may retain cached information when you close out the the UIWebView. I ' ve tried removing a uiwebview from my uiviewcontroller, releasing it, then creating a new one. The new one remembered exactly where I am at while I went back to an address without have to reload everything (it remem Bered my previous UIWebView is logged in).

So a couple of suggestions:

[[NSURLCache sharedURLCache] removeCachedResponseForRequest:NSURLRequest];

This would remove a cached response for a specific request. There is also a call that would remove all cached responses for all requests ran on the UIWebView:

[[NSURLCache sharedURLCache] removeAllCachedResponses];

After this, you can try deleting any associated cookie with the UIWebView:

For(Nshttpcookie *Cookie in[[Nshttpcookiestorage Sharedhttpcookiestorage] Cookies)  {    if ([[cookie domain] Isequaltostring: somensstringurldomain)  {        [[nshttpcookiestorage Sharedhttpcookiestorage]:cookie];}}        

Let me know where this gets you.

I had nearly the same problem. I wanted the webview cache to being cleared, because everytime i reload a local webpage in an UIWebView, the old one is shown . So I found a solution by simply setting thecachepolicy property of the request. Use a nsmutableurlrequest to set the This property. With all this everything works fine with reloading the UIWebView.

Nsurl*Url= [Nsurl Fileurlwithpath:myhtmlfilepath];  nsmutableurlrequest *Request = [nsmutableurlrequest requestwithurl: URL];  [request Setcachepolicy:nsurlrequestreloadignoringlocalcachedata];  [self.  WebView loadrequest:request];            

Hope that helps!

Don ' t disable caching completely, it ' ll hurt your app performance and it ' s unnecessary. The important thing is to explicitly configure the cache in app startup and purge it when necessary.

So in application:DidFinishLaunchingWithOptions: configure the cache limits as follows:

- (BOOL)Application:(UIApplication *)Application Didfinishlaunchingwithoptions:(Nsdictionary *)Launchoptions{IntCachesizememory= 4*1024*1024; 4MBIntCachesizedisk= 32*1024*1024; 32MBNsurlcache *sharedcache = [[[nsurlcache Alloc]:cachesizememory diskcapacity:cachesizedisk diskpath:@ "Nsurlcache"   Autorelease;     [nsurlcache:sharedcache];//... other launching Code}    

Once you have it properly configured and then if you need to purge the cache (for example in applicationDidReceiveMemoryWarning or if you close a UIWebView ) Just do:

[[NSURLCache sharedURLCache] removeAllCachedResponses];

And you'll see the memory is recovered. I blogged about this issue here:http://twobitlabs.com/2012/01/ios-ipad-iphone-nsurlcache-uiwebview-memory-utilization/

You can disable the caching by doing the following:

NSURLCache *sharedCache = [[NSURLCache alloc] initWithMemoryCapacity:0 diskCapacity:0 diskPath:nil];[NSURLCache setSharedURLCache:sharedCache];[sharedCache release];

How the iphone empties the UIWebView cache