WkWebView清除缓存

    // allWebsiteDataTypes清除所有缓存
    NSSet *websiteDataTypes = [WKWebsiteDataStore allWebsiteDataTypes];

    NSDate *dateFrom = [NSDate dateWithTimeIntervalSince1970:0];

    [[WKWebsiteDataStore defaultDataStore] removeDataOfTypes:websiteDataTypes modifiedSince:dateFrom completionHandler:^{
        
    }];