iOS 怎么给WKWebView清除缓存

很多时候，我们在更改了h5的数据源之后，再次进入h5页面的时候，WKWebView里的的数据没有实时的刷新，这个时候我们会很纳闷，第一时间会想到是缓存在捣鬼，想到要清除缓存，怎么清除缓存，见如下代码：

#pragma mark  -- WKWebView清除缓存 --
-(void)dealloc {
    [self clearCacheAndCookie];
}

- (void)clearCacheAndCookie {
    //清除cookies
    NSHTTPCookie *cookie;
    NSHTTPCookieStorage *storage = [NSHTTPCookieStorage sharedHTTPCookieStorage];
    for (cookie in [storage cookies]) {
        [storage deleteCookie:cookie];
    }
    
    [[NSURLCache sharedURLCache] removeAllCachedResponses];
    NSURLCache * cache = [NSURLCache sharedURLCache];
    [cache removeAllCachedResponses];
    [cache setDiskCapacity:0];
    [cache setMemoryCapacity:0];
    
    WKWebsiteDataStore *dataStore = [WKWebsiteDataStore defaultDataStore];
    [dataStore fetchDataRecordsOfTypes:[WKWebsiteDataStore allWebsiteDataTypes] completionHandler:^(NSArray<WKWebsiteDataRecord *> * _Nonnull records) {
        for (WKWebsiteDataRecord *record in records) {
            [[WKWebsiteDataStore defaultDataStore] removeDataOfTypes:record.dataTypes forDataRecords:@[record] completionHandler:^{
                NSLog(@"WKWebView清除缓存 ========= Cookies for %@ deleted successfully",record.displayName);
            }];
        }
    }];
}