WebView加载url不更新 清除缓存 iOS开发

后台更新了URL的内容之后，在没有删除app的情况下直接进行了安装，导致出现了网页内容不更新的情况，在删除了原来的APP，重新打包之后，情况恢复，怀疑是自己写的webview没有添加清除缓存功能造成，下面是清除缓存的代码：

- (void)leftBarButtonAction : (UIBarButtonItem *)sender {
    [self.baseButton removeFromSuperview];
    _baseWebView = nil;
    [self cleanCacheAndCookie];
    [self.navigationController popViewControllerAnimated:YES];
}

- (void)cleanCacheAndCookie{
    //清除cookies
    NSHTTPCookie *cookie;
    NSHTTPCookieStorage *storage = [NSHTTPCookieStorage sharedHTTPCookieStorage];
    for (cookie in [storage cookies]){
        [storage deleteCookie:cookie];
    }
    //清除UIWebView的缓存
    [[NSURLCache sharedURLCache] removeAllCachedResponses];
    NSURLCache * cache = [NSURLCache sharedURLCache];
    [cache removeAllCachedResponses];
    [cache setDiskCapacity:0];
    [cache setMemoryCapacity:0];
} 

或者加载的时候直接禁止缓存

request = [NSURLRequest requestWithURL:url  cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:10];