Memory NSURLCache：表示它的缓存不是，并且内存状态没有变化

我试图通过记录NSURLCache周围的内存统计信息来确认URL缓存

我已将基本NSURLCache扩展如下：

@implementation  MarksCache : NSURLCache

- (NSCachedURLResponse *) cachedResponseForRequest:(NSURLRequest *)request;
{
    NSString *myString = [request.URL absoluteString];
    DDLogVerbose(@"URL CACHE GET : PRE  : %@ %d %d %d %d", myString,
                 [NSURLCache sharedURLCache].currentDiskUsage ,
                 [NSURLCache sharedURLCache].currentMemoryUsage,
                 [NSURLCache sharedURLCache].diskCapacity,
                 [NSURLCache sharedURLCache].memoryCapacity);

    NSCachedURLResponse *resp = [super cachedResponseForRequest:request];
    //NSURLResponse *rp = [resp response];
    //NSString *rpdesc = [rp description];

    //NSData *data = [resp data];
    //NSString *respdesc = [resp description];
    //NSString *selfdesc = [super description];

    DDLogVerbose(@"URL CACHE GET : POST : %@ %d %d %d %d", myString,
                 [NSURLCache sharedURLCache].currentDiskUsage ,
                 [NSURLCache sharedURLCache].currentMemoryUsage,
                 [NSURLCache sharedURLCache].diskCapacity,
                 [NSURLCache sharedURLCache].memoryCapacity);

    return resp;
}

- (void)storeCachedResponse:(NSCachedURLResponse *)cachedResponse forRequest:(NSURLRequest *)request
{
    NSString *myString = [request.URL absoluteString];
    DDLogVerbose(@"URL CACHE SET : PRE  : %@ %d %d %d %d", myString,
                 [NSURLCache sharedURLCache].currentDiskUsage ,
                 [NSURLCache sharedURLCache].currentMemoryUsage,
                 [NSURLCache sharedURLCache].diskCapacity,
                 [NSURLCache sharedURLCache].memoryCapacity);
    [super cachedResponseForRequest:request];
    DDLogVerbose(@"URL CACHE SET : POST : %d %d %d %d",
                [NSURLCache sharedURLCache].currentDiskUsage ,
                [NSURLCache sharedURLCache].currentMemoryUsage,
                [NSURLCache sharedURLCache].diskCapacity,
                [NSURLCache sharedURLCache].memoryCapacity);
}

@end

我还有执行以下操作的按钮代码：

- (IBAction)onClearButtonPress:(id) sender{
    DDLogVerbose(@"TestViewController onClearButtonPress : START : PRE : %d %d %d %d", 
    [NSURLCache sharedURLCache].currentDiskUsage , 
    [NSURLCache sharedURLCache].currentMemoryUsage, 
    [NSURLCache sharedURLCache].diskCapacity,  
    [NSURLCache sharedURLCache].memoryCapacity);

    [NSURLCache sharedURLCache].removeAllCachedResponses;

    DDLogVerbose(@"TestViewController onClearButtonPress : START : POST : %d %d %d %d", 
    [NSURLCache sharedURLCache].currentDiskUsage , 
    [NSURLCache sharedURLCache].currentMemoryUsage, 
    [NSURLCache sharedURLCache].diskCapacity,  
    [NSURLCache sharedURLCache].memoryCapacity);

    }

当我单击视图上的一些测试按钮来触发URLConnection事件时，我看到这些方法被正确的URL调用。但是，缓存内存和磁盘使用情况统计数据永远不会改变

来自日志的示例

URL CACHE SET : PRE  : https://<domain.com>/resources/images/bg/bg-blue.png 1970176 0 10000000 512000
URL CACHE SET : POST : https://<domain.com>/resources/images/bg/bg-blue.png 1970176 0 10000000 512000

URL CACHE GET : PRE  : https://<domain.com>/resources/images/bg/bg-footer.png 1970176 0 10000000 512000
URL CACHE GET : POST : https://<domain.com>/resources/images/bg/bg-footer.png 1970176 0 10000000 512000

TestViewController onClearButtonPress : START : PRE : 1970176 0 10000000 512000
TestViewController onClearButtonPress : EXIT : POST : 1970176 0 10000000 512000

URL CACHE SET : PRE  : https://<domain.com>/resources/images/bg/bg-footer.png 1970176 0 10000000 512000
URL CACHE SET : POST : https://<domain.com>/resources/images/bg/bg-footer.png 1970176 0 10000000 512000

URL缓存集：PRE:https:///resources/images/bg/bg-blue.png 1970176 0 10000000 512000
URL缓存集：发布：https:///resources/images/bg/bg-blue.png 1970176 0 10000000 512000
URL缓存获取：PRE:https:///resources/images/bg/bg-footer.png 1970176 0 10000000 512000
URL缓存获取：发布：https:///resources/images/bg/bg-footer.png 1970176 0 10000000 512000
TestViewController OnClearButton按：开始：前：1970176 0 10000000 512000
TestViewController OnClearButton按：退出：POST:1970176 0 10000000 512000
URL缓存集：PRE:https:///resources/images/bg/bg-footer.png 1970176 0 10000000 512000
URL缓存集：发布：https:///resources/images/bg/bg-footer.png 1970176 0 10000000 512000

这让我相信：

1-我做错了什么，没有正确地观察缓存行为

2-此缓存不是真正的缓存

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任何想法都将不胜感激

我不久前就明白了这一点，想发布答案。 我已将我的代码作为代表：

NSURLConnection-连接：willCacheResponse

该方法允许您在缓存行为发生之前覆盖它。我只是简单地将日志放在其中，以查看我的响应是否可缓存，而忘记了实际执行任何缓存。一旦修复，我的内存统计日志确实显示了项目进入和退出缓存