Debugging memory leaks

In debug mode Rx tracks all allocated resources in a global variable Resources.total.

In case you want to have some resource leak detection logic, the simplest method is just printing out RxSwift.Resources.total periodically to output.

    /* add somewhere in
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey : Any]? = nil)
    */
    _ = Observable<Int>.interval(1, scheduler: MainScheduler.instance)
        .subscribe(onNext: { _ in
            print("Resource count \(RxSwift.Resources.total)")
        })

Most efficient way to test for memory leaks is:

• navigate to your screen and use it
• navigate back
• observe initial resource count
• navigate second time to your screen and use it
• navigate back
• observe final resource count

In case there is a difference in resource count between initial and final resource counts, there might be a memory leak somewhere.

The reason why 2 navigations are suggested is because first navigation forces loading of lazy resources.