Have you had experience in finding and fixing memory or resource leaks in your projects?

Yes, in iOS projects I have encountered memory leaks, most often related to cyclic references between objects, such as between closures and classes. To find such leaks, I used Xcode tools — Instruments with the Leaks and Allocations profiler.

I fixed leaks by applying weak or unowned references where necessary to break retain cycles. I also checked the proper release of resources and unsubscription from notifications.

An example of a weak reference in a closure:

class ViewController: UIViewController {
    var closure: (() -> Void)?

    func setupClosure() {
        closure = { [weak self] in
            guard let self = self else { return }
            print(self.view)
        }
    }
}