内容简介：不是100％肯定,但我认为您需要使用NSURLConnection返回的NSURLResponse而不是创建自己的NSURLResponse.我怀疑如果您只是创建一个NSURLResponse,它没有为缓存设置任何标头,因此NSURLCache假定它应该缓存此特定结果.翻译自：https://stackoverflow.com/questions/8936488/nsurlcache-not-caching
所以我已经子类化NSURLCache并且每次调用load HTML
FromString时：它调用storeCachedRequest：forRequest：然后调用cachedResponseForRequest：.这就是我所拥有的：
- (NSCachedURLResponse *)cachedResponseForRequest:(NSURLRequest *)request
{
NSString *pathString = [[request URL] absoluteString];
NSCachedURLResponse * response = [super cachedResponseForRequest:request];
if (response != nil)
return response;
else {
NSString* myString= @"testing";
NSData* data=[myString dataUsingEncoding: NSASCIIStringEncoding ];
//
// Create the cacheable response
//
NSURLResponse *response =
[[[NSURLResponse alloc]
initWithURL:[request URL]
MIMEType:[self mimeTypeForPath:pathString]
expectedContentLength:[data length]
textEncodingName:nil]
autorelease];
NSCachedURLResponse * cachedResponse =
[[[NSCachedURLResponse alloc] initWithResponse:response data:data] autorelease];
[self storeCachedResponse:cachedResponse forRequest:request] ;
//NSLog(@"DEFAULT CACHE WITH URL %@", [[request URL] absoluteString]);
return [super cachedResponseForRequest:request];
}
return nil;
}
- (void)storeCachedResponse:(NSCachedURLResponse *)cachedResponse forRequest:(NSURLRequest *)request
{
[super storeCachedResponse:cachedResponse forRequest:request];
NSLog(@"STORE CACHED RESPONSE WITH URL %@", [[request URL] absoluteString]);
}
问题是当我调用cachedResponseForRequest时：在保存之后,响应总是为零.为什么是这样？
我有：
NSURLRequest * req = [NSURLRequest requestWithURL:[NSURL URLWithString:self.imageSource_]];
NSCachedURLResponse * response = [[NSURLCache sharedURLCache] cachedResponseForRequest:req];
if (response == nil)
NSLog(@"RESPONSE IS NIL");
else {
NSString* theString = [[NSString alloc] initWithData:response.data encoding:NSASCIIStringEncoding];
NSLog(@"RESPONSE IS NOT NIL %@", theString);
}
并且它总是打印响应为零. url字符串与它时的字符串相同
storeCachedResponse.出于某种原因,它不是缓存.我已将缓存大小设置为一定的大小.
不是100％肯定,但我认为您需要使用NSURLConnection返回的NSURLResponse而不是创建自己的NSURLResponse.我怀疑如果您只是创建一个NSURLResponse,它没有为缓存设置任何标头,因此NSURLCache假定它应该缓存此特定结果.
翻译自：https://stackoverflow.com/questions/8936488/nsurlcache-not-caching
以上所述就是小编给大家介绍的《iphone – NSURLCache没有缓存》，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对 码农网 的支持！
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