如何在iOS中缓存带有图片的整个网页

Question

如何在iOS中缓存带有图片的整个网页

15

我正在iOS上开发一个图片和文本混合页面。我知道可以使用UIWebView来实现这个目标。但问题是，用户可能需要离线阅读该页面。对于文本部分，我可以将html保存到磁盘并在离线模式下加载它。但图片如何处理呢？是否可以将图片缓存到磁盘中，使UIWebView仍能够显示它们？谢谢！

- mr.pppoe

1个回答

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- xoebus · Accepted Answer

ASIHTTPRequest项目有一个名为ASIWebPageRequest的类，旨在实现您想要的功能。如果您可以接受将额外的依赖项添加到您的项目中，则我认为这是一个很好的解决方案：ASIWebPageRequest。

在我上面喜欢的页面上，有一些很好的示例说明如何使用它，但为了完整起见，我将在此处包含其中一个示例：

- (IBAction)loadURL:(NSURL *)url
{
   // Assume request is a property of our controller
   // First, we'll cancel any in-progress page load
   [[self request] setDelegate:nil];
   [[self request] cancel];

   [self setRequest:[ASIWebPageRequest requestWithURL:url]];
   [[self request] setDelegate:self];
   [[self request] setDidFailSelector:@selector(webPageFetchFailed:)];
   [[self request] setDidFinishSelector:@selector(webPageFetchSucceeded:)];

   // Tell the request to embed external resources directly in the page
   [[self request] setUrlReplacementMode:ASIReplaceExternalResourcesWithData];

   // It is strongly recommended you use a download cache with ASIWebPageRequest
   // When using a cache, external resources are automatically stored in the cache
   // and can be pulled from the cache on subsequent page loads
   [[self request] setDownloadCache:[ASIDownloadCache sharedCache]];

   // Ask the download cache for a place to store the cached data
   // This is the most efficient way for an ASIWebPageRequest to store a web page
   [[self request] setDownloadDestinationPath:
      [[ASIDownloadCache sharedCache] pathToStoreCachedResponseDataForRequest:[self request]]];

   [[self request] startAsynchronous];
}

- (void)webPageFetchFailed:(ASIHTTPRequest *)theRequest
{
   // Obviously you should handle the error properly...
   NSLog(@"%@",[theRequest error]);
}

- (void)webPageFetchSucceeded:(ASIHTTPRequest *)theRequest
{
   NSString *response = [NSString stringWithContentsOfFile:
      [theRequest downloadDestinationPath] encoding:[theRequest responseEncoding] error:nil];
   // Note we're setting the baseURL to the url of the page we downloaded. This is important!
   [webView loadHTMLString:response baseURL:[request url]];
}