UIWebView清除Cookie：
//清除cookies NSHTTPCookie *cookie; NSHTTPCookieStorage *storage = [NSHTTPCookieStorage sharedHTTPCookieStorage]; for (cookie in [storage cookies]) { [storage deleteCookie:cookie]; }
UIWebView清除缓存：
//清除UIWebView的缓存 [[NSURLCachesharedURLCache] removeAllCachedResponses];
(By ItNoob.Matrix 链接 http://www.cnblogs.com/ItNoob)
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NSURLCache * cache = [NSURLCache sharedURLCache];
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[cache removeAllCachedResponses];
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[cache setDiskCapacity:0];
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[cache setMemoryCapacity:0];