Hi @Developer Tools Engineer, memory graph debugger can't capture leaks on my simple demo:
I have 2 view controllers. View controller 1 is the root view controller of the app
View controller 1 will use navigation controller to push to view controller 2 (which has retain cycle between itself and a closure)
However, after I tap "Back" button in the navigation controller to go back to view controller 1 -> Memory graph debugger not show "ViewController2" as leak.
Things to note here:
This is leaks, not abandoned memory (since we can't not access to view controller 2) from anywhere else.
So I wonder why Memory Graph Debugger doesn't work on this simple demo?
This is the code of the sample project:
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
}
@IBAction func didTapButton(_ sender: Any) {
let vc2 = ViewController2()
navigationController?.pushViewController(vc2, animated: true)
}
}
final class ViewController2: UIViewController {
private var callback: (() -> Void)?
override func viewDidLoad() {
super.viewDidLoad()
callback = {
self.view.backgroundColor = .red // retain cycle here
}
}
}
Topic:
UI Frameworks
SubTopic:
AppKit
Tags: