加载NSURLRequest时UIWebview中的内存泄漏

Question

我为自己的应用创建了自定义浏览器。每当我将URL请求加载到Web视图中时，都会看到内存泄漏。请注意，不会显示回溯。应用程序有一个webview，下面是一个刷新按钮。

刷新按钮上的代码如下

   - (IBAction)refresh:(id)sender
{
// Some solution suggested by online community but in vain
    [wvWebView loadHTMLString:@"" baseURL:nil];
    [wvWebView stopLoading];
    wvWebView.delegate = nil;

// Clearing cache Memory
    [[NSUserDefaults standardUserDefaults] setInteger:0 forKey:@"WebKitCacheModelPreferenceKey"];
    [[NSURLCache sharedURLCache] removeAllCachedResponses];
    [[NSURLCache sharedURLCache] setDiskCapacity:0];
    [[NSURLCache sharedURLCache] setMemoryCapacity:0];

// Deleting all the cookies
    for(NSHTTPCookie *cookie in [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookies])
    {     
            [[NSHTTPCookieStorage sharedHTTPCookieStorage] deleteCookie:cookie];
    }

// Loading webview with desired url
    [wvWebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.google.com"]]];
}

请尽早帮我解决这个问题