Image 覆盖NSURLCache'；s CachedResponseFor使用三个缓存UIWebView资产的请求20

我需要缓存要进入webview的web源映像（即非捆绑源映像）。通常我只需要请求图像并将其转换为base-64，然后将其粘贴到HTML中，但如果我有100个图像，我就无法做到这一点

因此，我四处搜索，找到了一种获取图像请求的方法，方法是通过子类化

NSURLCache

并重写

cachedResponseForRequest

。我的代码如下

我可以很好地处理请求，我可以取回数据并将其打印出来，我从数据中制作了一个UIImage，并得到了它的大小，以知道它肯定在那里，等等。但是当我返回

缓存响应请求

本身，并查看

UIWebView

，它只是显示了一个缺少的图像。我为这件事苦恼了一天，但还是想不出来。我看了一个又一个例子，没有雪茄

谁能帮我解决这个问题？它快把我逼疯了

下面是我的

NSURLCache

子类的.m文件的内容

GimageData

是一个实例变量，用于存储接收到的当前图像数据

正如你所知，我之所以搜索/替换http://to http://是因为http://链接显然没有通过这种方法获取，所以我让链接看起来像是捆绑包中的某个东西，然后我还原URL进行检索

- (NSCachedURLResponse*)cachedResponseForRequest:(NSURLRequest*)request
{
    NSURL *url = [request URL];

 NSLog(@"Url requested is: %@", [url absoluteString] );


 NSRange textRange;

 textRange = [[[url absoluteString] lowercaseString] rangeOfString:[@"http___" lowercaseString]];
 NSCachedURLResponse *cachedResponse = nil;

 if(textRange.location != NSNotFound) {

  //Does contain the substring
  NSLog(@"Found an http___ request");
  NSString *newURL = [[url absoluteString] substringFromIndex:textRange.location];
  newURL = [newURL stringByReplacingOccurrencesOfString:@"http___" withString:@"http://"];
  NSLog(@"New url: %@", newURL);

  TTURLDataResponse *response = [[TTURLDataResponse alloc] init];
  TTURLRequest *imageRequest = [[TTURLRequest alloc] initWithURL:newURL
                 delegate:self];
  imageRequest.response = response;
  [response release];
  [imageRequest sendSynchronously];


  if ( GimageData ) {
   NSLog(@"Response: %d as %@", [GimageData bytes], [GimageData class]);
   NSLog(@"Storing under: %@ ", request.URL );

   NSURLResponse* Nresponse = [[NSURLResponse alloc] initWithURL:request.URL 
                 MIMEType:nil 
             expectedContentLength:[GimageData length] 
               textEncodingName:nil];

   cachedResponse = [[NSCachedURLResponse alloc] initWithResponse:Nresponse
                   data:GimageData];

   [imageRequest release];
   [Nresponse release];
   NSLog(@"Cached the response.");
  }

 }

 if (cachedResponse == nil) {
  NSLog(@"Response is nil so getting super's cache");
  cachedResponse = [super cachedResponseForRequest:request];
 }

    return cachedResponse;
}


- (void)requestDidFinishLoad:(TTURLRequest*)request {
 NSLog(@"Request did finish loading.");

 TTURLDataResponse *response = request.response;
// NSURL *url = [NSURL URLWithString:request.urlPath];

 GimageData = response.data;


 if ( GimageData ) {
  NSLog(@"And we got the data.");
 }
 else {
  NSLog(@"But there was no data in the response.");
 }

}

---

事实上，如果确保同步发送请求，则可以将图像转换为base64并将其插入HTML。否则，图像将在加载HTML之后加载，您必须加载HTML两次。事实上，它可能是比拦截NSURLCache请求更优雅的解决方案。