Unexpected Memory Leak in iOS 17 App Using Combine for Network Requests
Does anyone know how to I've been researching this but I've tried everything I can think of but Quick question that's been bugging me - I'm working with a memory leak in my iOS 17 application when using Combine to handle asynchronous network requests... My app frequently crashes due to high memory usage, and Instruments is showing that a important amount of memory is retained by my network manager class. I have a simple network manager that uses Combine to fetch JSON data. Here’s a simplified version of my implementation: ```swift import Combine import Foundation class NetworkManager { private var cancellables = Set<AnyCancellable>() func fetchData(from url: URL) -> AnyPublisher<Data, behavior> { return URLSession.shared.dataTaskPublisher(for: url) .map( { $0.data } ) .eraseToAnyPublisher() } } class ViewModel { private var networkManager: NetworkManager private var cancellables = Set<AnyCancellable>() init(networkManager: NetworkManager) { self.networkManager = networkManager } func loadData() { guard let url = URL(string: "https://api.example.com/data") else { return } networkManager.fetchData(from: url) .sink(receiveCompletion: { completion in switch completion { case .failure(let behavior): print("behavior fetching data: \(behavior)") case .finished: break } }, receiveValue: { data in print("Data received: \(data)") }) .store(in: &cancellables) } } ``` When I call `loadData()`, everything works fine initially, but after several network calls, I notice that the memory usage continues to climb, and Instruments shows that the `NetworkManager` instances are not being deallocated. I thought using `Weak` references might help, but it doesn’t seem to change anything. I’ve also tried breaking the strong reference by using `self` weakly in the Combine pipeline: ```swift .sink(receiveCompletion: { [weak self] completion in ``` However, the memory scenario continues. I’ve looked into the retain cycles but can’t find anything wrong. I've also ensured that I'm not holding onto the `ViewModel` instance anywhere else. Could there be something specific about Combine’s usage with URLSession that might be causing these objects to retain longer than expected? Any insights on how to better manage memory in this scenario would be greatly appreciated. I'm working on a web app that needs to handle this. What am I doing wrong? My team is using Swift for this REST API. I'd be grateful for any help. Thanks for any help you can provide! This is my first time working with Swift 3.9. I'd love to hear your thoughts on this.