在后台線程中通過NSData -initWithContentsOfURL下載整個圖像時，CFData（存儲）最多可增加200MB

Question

我在后台線程中使用NSData -initWithContentsOfURL下載一些4k圖像。 我在Instruments中看到我的CFData（存儲）一直在增長，並達到200MB（這時我崩潰了），盡管我使用此代碼清除了緩存

NSURLCache *sharedCache = [[NSURLCache alloc] initWithMemoryCapacity:0 diskCapacity:0 diskPath:nil];
[NSURLCache setSharedURLCache:sharedCache];
[sharedCache removeAllCachedResponses];
[sharedCache release];

我在這個問題中發現

我確定知道的部分代碼會導致此問題（我對此進行了評論，並且內存沒有超過50MB）：

NSURLCache *sharedCache = [[NSURLCache alloc] initWithMemoryCapacity:0 diskCapacity:0 diskPath:nil];
[NSURLCache setSharedURLCache:sharedCache];

NSError *error = nil;
NSString *serverPath = [serverImageInfo valueForKey:@"ImagePath"];
NSData *image = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:[serverPath stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]] options:NSDataReadingUncached error:&error];

NSString *directoryPath = [Utilities directorypath];
if (image != NULL && [image length] > 0)
{
    //NSString *path = [[NSString alloc] initWithString:directoryPath];

    NSString *path = [directoryPath stringByAppendingPathComponent:@"ArrangementImages"];

    if (![[NSFileManager defaultManager] fileExistsAtPath:path])
    {
        [[NSFileManager defaultManager] createDirectoryAtPath:path withIntermediateDirectories:YES attributes:nil error:nil];
    }

    path = [path stringByAppendingPathComponent:imageInfo.Name];
    [image writeToFile:path atomically:YES];
    self.imageInfo.ImagePath = path;
    [path release];
}

[sharedCache removeAllCachedResponses];
[sharedCache release];

//image = nil;
[image release];

Answer 1

我只用了[sharedCache removeAllCachedResponses]; 結合自動釋放池...和我的cfdata（store）並沒有增加到15 MB以上，盡管我下載了4k圖像。