5

我正在尝试使用 ASIHTTP ( http://allseeing-i.com/ASIHTTPRequest/How-to-use#using_a_download_cache ) 将数据保存到缓存中。我不确定我做错了什么，但似乎没有将数据存储到缓存中。以下代码的输出是这样的：

2010-08-12 15:44:13.801 TabBar[51728:207] Success is YES
2010-08-12 15:44:13.802 TabBar[51728:207] Success is NO
2010-08-12 15:44:13.804 TabBar[51728:207] Success is YES
2010-08-12 15:44:13.805 TabBar[51728:207] S-----------
2010-08-12 15:44:13.874 TabBar[51728:207] Success is YES
2010-08-12 15:44:13.874 TabBar[51728:207] Success is NO
2010-08-12 15:44:13.876 TabBar[51728:207] Success is YES

这是代码：

[[ASIDownloadCache sharedCache] clearCachedResponsesForStoragePolicy:
                              ASICacheForSessionDurationCacheStoragePolicy];
[[ASIDownloadCache sharedCache] 
                    setDefaultCachePolicy:ASIOnlyLoadIfNotCachedCachePolicy];
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:[NSURL 
                                URLWithString:@"http://www.nytimes.com/"]];
[request setDownloadCache:[ASIDownloadCache sharedCache]];
[request startSynchronous];

request = [ASIHTTPRequest requestWithURL:[NSURL 
                                URLWithString:@"http://www.nytimes.com/"]];
[request setDownloadCache:[ASIDownloadCache sharedCache]];
[request startSynchronous];
BOOL success = ([request responseStatusCode] == 200);
NSLog(@"Success is %@\n", (success ? @"YES" : @"NO"));

success = [request didUseCachedResponse];
NSLog(@"Success is %@\n", (success ? @"YES" : @"NO"));

success = ([[request responseData] length]);
NSLog(@"Success is %@\n", (success ? @"YES" : @"NO"));

NSLog(@"S-----------");
request = [ASIHTTPRequest requestWithURL:[NSURL 
                    URLWithString:@"http://www.nytimes.com/"]];
[request setDownloadCache:[ASIDownloadCache sharedCache]];
[request startSynchronous];
success = ([request responseStatusCode] == 200);
NSLog(@"Success is %@\n", (success ? @"YES" : @"NO"));

success = [request didUseCachedResponse];
NSLog(@"Success is %@\n", (success ? @"YES" : @"NO"));

success = ([[request responseData] length]);
NSLog(@"Success is %@\n", (success ? @"YES" : @"NO"));

有人可以给我一些有关如何完成此操作的代码片段吗？

谢谢！

-------------------------------------------------- ---------------------

新代码修订：

NSURL *url = [NSURL URLWithString:imageURL];

ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
[request setDownloadCache:[ASIDownloadCache sharedCache]];
[request setCacheStoragePolicy:ASICachePermanentlyCacheStoragePolicy];
[request setCachePolicy:ASIOnlyLoadIfNotCachedCachePolicy];
[request setSecondsToCache:60*60*24*30]; // Cache for 30 days

[request startSynchronous];//startAsynchronous];

BOOL success = [request didUseCachedResponse];
NSLog(@"------------>>>>>>> Success is %@\n", (success ? @"YES" : @"NO"));

NSData *responseData = [request responseData];
UIImage *image = [[UIImage alloc] initWithData:responseData];

这仅适用于 [request startSynchronous]; 如果我尝试异步方法，它不会调用此函数：

- (void)requestFinished:(ASIHTTPRequest *)request
4

2 回答 2

4

你错过了这样的东西，

ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
[request setDownloadCache:[ASIDownloadCache sharedCache]];
[request setCacheStoragePolicy:ASICachePermanentlyCacheStoragePolicy];
[request setCachePolicy:ASIOnlyLoadIfNotCachedCachePolicy];
[request setSecondsToCache:60*60*24*30]; // Cache for 30 days
[request setDelegate:self]; // A delegate must be specified
[request setDidFinishSelector:@selector(requestFinished:)]; // And an appropriate selector specified

你也应该有

- (void)requestFinished:(ASIHTTPRequest *)request {
  BOOL success = [request didUseCachedResponse];
  NSLog(@"------------>>>>>>> Success is %@\n", (success ? @"YES" : @"NO"));

  NSData *responseData = [request responseData];
  UIImage *image = [[UIImage alloc] initWithData:responseData];

  ...
}

这应该可以解决问题。

于 2011-04-07T23:19:01.807 回答
1

nytimes.com 设置了很多“不要缓存我”类型的标题：

    $头 http://www.nytimes.com/           
    200 好
    缓存控制：无缓存
    日期：格林威治标准时间 2010 年 8 月 13 日星期五 07:14:46
    Pragma：无缓存
    服务器：Sun-ONE-Web-Server/6.1
    内容长度：121266
    内容类型：文本/html
    过期：1994 年 12 月 1 日星期四 16:00:00 GMT

所以我希望这些都是问题所在。

您可以尝试设置：

[[ASIDownloadCache sharedCache] shouldRespectCacheControlHeaders:NO];
于 2010-08-13T07:19:07.703 回答