Memory Management Issues with Block-Based API Callbacks in Objective-C
I keep running into Quick question that's been bugging me - I'm experiencing unexpected behavior when using block-based API callbacks in my Objective-C application..... I recently integrated a library that fetches data asynchronously and uses blocks to return the response. The callback block captures a reference to `self`, which seems to be causing retain cycles, leading to memory leaks. I've tried using `__weak` to avoid strong reference cycles, but I'm still encountering issues. Here's a simplified version of my code: ```objc @interface MyViewController : UIViewController @property (nonatomic, strong) NSArray *dataArray; @end @implementation MyViewController - (void)viewDidLoad { [super viewDidLoad]; [self fetchData]; } - (void)fetchData { MyAPI *api = [[MyAPI alloc] init]; __weak typeof(self) weakSelf = self; [api fetchDataWithCompletion:^(NSArray *data) { __strong typeof(weakSelf) strongSelf = weakSelf; if (strongSelf) { strongSelf.dataArray = data; [strongSelf.tableView reloadData]; } }]; } @end ``` Despite using `__weak` and then converting to `__strong` within the block, I'm still seeing memory warnings and crashes related to deallocated instances, specifically in the callback. The output from Xcode indicates that there's an attempt to access `strongSelf` after it has been deallocated. I checked for other strong references but couldn't identify the source. Has anyone faced a similar issue while working with blocks in Objective-C? Any advice on best practices for managing memory in this scenario would be greatly appreciated. My development environment is macOS. I'd really appreciate any guidance on this. I'm on Linux using the latest version of Objective-C. What am I doing wrong?