清除UIWebview缓存 [英] Clearing UIWebview cache

问题描述

我使用UIWebview加载网页使用 loadRequest：方法，当我离开那个场景，我调用 [self.webView stopLoading];

在第一次启动的活动监视器中，我看到真实内存增加了4MB，并且在多次启动/加载真正的内存不增加。它只增加一次。

我检查了webview的保留计数。这是正确的，即0.我认为UIWebView正在缓存一些数据。如何避免缓存或删除缓存数据？

我实际上认为它可能会保留缓存的信息，当你关闭了<$ c $

c> UIWebView 。我试图从我的 UIViewController 中删除​​ UIWebView ，释放它，然后创建一个新的。当我回到一个地址，而不必重新加载任何东西（它记住我以前的 UIWebView 已经登录）时，新的人记住了我在哪里。

有几个建议：

  [[NSURLCache sharedURLCache] removeCachedResponseForRequest：NSURLRequest]; 
  

这将删除特定请求的缓存响应。还有一个调用将删除 UIWebView 上运行的所有请求的所有缓存响应：

  [[NSURLCache sharedURLCache] removeAllCachedResponses];之后，您可以尝试使用 UIWebView 删除任何关联的cookie， code>：
  for（NSHTTPCookie * cookie in [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookies]）{
 
 if（[[cookie domain] isEqualToString：someNSStringUrlDomain]）{
 
 [[NSHTTPCookieStorage sharedHTTPCookieStorage] deleteCookie：cookie]; 
} 
} 
  
让我知道在哪里可以找到你。
 
I have used UIWebview to load a web page using loadRequest: method, when I leave that scene I call [self.webView stopLoading]; and release the webView.

In activity monitor on first launch i have seen that the real memory increased by 4MB, and on multiple launches/loading the real memory doesn't increase. It is increasing only once.

I have checked the retain count of webview. It is proper i.e., 0. I think UIWebView is caching some data. How do I avoid caching or remove cached data? Or is there another reason for this?
解决方案
I actually think it may retain cached information when you close out 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 was at when I went back to an address without having to reload everything (it remembered my previous UIWebView was 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 will remove all cached responses for all requests ran on the UIWebView:
[[NSURLCache sharedURLCache] removeAllCachedResponses];
After that, you can try deleting any associated cookies with the UIWebView:
for(NSHTTPCookie *cookie in [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookies]) {

    if([[cookie domain] isEqualToString:someNSStringUrlDomain]) {

        [[NSHTTPCookieStorage sharedHTTPCookieStorage] deleteCookie:cookie];
    }
}
Let me know where that gets you.

                        
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