iOS UIWebView清除缓存

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
[[NSURLCache sharedURLCache] removeAllCachedResponses];

//清除缓存（全）NSURLCache * cache = [NSURLCache sharedURLCache];  [cache removeAllCachedResponses];  [cache setDiskCapacity:0];  [cache setMemoryCapacity:0];