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UIWebView缓存清理的方式

https://stackoverflow.com/questions/2523435/how-to-clear-uiwebview-cache

if (lastReq){    [[NSURLCache sharedURLCache] removeCachedResponseForRequest:lastReq];    [[NSURLCache sharedURLCache] removeAllCachedResponses];}lastReq=[NSMutableURLRequest requestWithURL:[NSURL URLWithString:localUrl]                                   cachePolicy:NSURLRequestReloadIgnoringCacheData                               timeoutInterval:10000];[lastReq setCachePolicy:NSURLRequestReloadIgnoringLocalCacheData];[self.mainWebView loadRequest:lastReq];

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