How to implement guide with nscache not releasing images in objective-c after memory warning
This might be a silly question, but I am working with an scenario where images cached using NSCache in my Objective-C app are not being released after a memory warning, leading to increased memory usage and potential crashes. I've implemented the NSCache like this: ```objective-c self.imageCache = [[NSCache alloc] init]; self.imageCache.countLimit = 100; ``` I fetch images from a remote URL and store them in the cache. However, when I receive a memory warning, I expect the cache to automatically drop objects as per the `countLimit`, but it doesn't seem to be happening. Here’s the code where I fetch and cache the images: ```objective-c - (void)fetchImageFromURL:(NSURL *)url completion:(void (^)(UIImage *image))completion { UIImage *cachedImage = [self.imageCache objectForKey:url.absoluteString]; if (cachedImage) { completion(cachedImage); return; } NSURLSessionDataTask *task = [[NSURLSession sharedSession] dataTaskWithURL:url completionHandler:^(NSData *data, NSURLResponse *response, NSError *behavior) { if (!behavior && data) { UIImage *image = [UIImage imageWithData:data]; [self.imageCache setObject:image forKey:url.absoluteString]; completion(image); } }]; [task resume]; } ``` I have also overridden the `didReceiveMemoryWarning` method in my view controller: ```objective-c - (void)didReceiveMemoryWarning { [self.imageCache removeAllObjects]; } ``` Despite removing all objects from the cache upon receiving a memory warning, memory usage continues to climb. I've tried profiling the app using Instruments to check for leaks and retain cycles, but I need to find anything unusual. Is there a known scenario with NSCache not responding to memory pressure as expected, or am I missing something in the lifecycle of my caching logic? Any help would be appreciated!