// ...
dependencies: [
    .package(url: "https://github.com/e-Sixt/Swen.git", from: "2.0.0"),
],
//...

import Swen

struct TestEvent: Event {
    let name: String
}

class TestViewController: UIViewController {

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        //register for incoming events
        Swen<TestEvent>.register(self) { event in
            print(event.name)
        }
        //post event
        Swen.post(TestEvent(name: "Sixt"))
    }

    override func viewDidDisappear(_ animated: Bool) {
        super.viewDidDisappear(animated)
        //unregister from events
        Swen<TestEvent>.unregister(self)
    }
}

// Registers on the main thread
Swen<Event>.register(_ observer: AnyObject, handler: (_ event: Event) -> Void)

// Registers on background queue
Swen<Event>.registerOnBackground(_ observer: AnyObject, handler: (_ event: Event) -> Void)

// Registers the closure on a specific queue
Swen<Event>.register(_ observer: AnyObject, onQueue queue: OperationQueue, handler: (_ event: Event) -> Void)

struct TestStickyEvent: StickyEvent {
    let name: String
}

print(Swen<TestStickyEvent>.sticky()?.name)

class TestViewController: UIViewController {

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        //post event
        Swen.post(TestStickyEvent(name: "Stick it"))

        //register for incoming events
        Swen<TestStickyEvent>.register(self) { event in
            print(event.name)
        }
    }
}

public struct SystemEvents {

    struct ApplicationWillEnterForeground: Event {
    }

    static func register(storage: SwenStorage = .defaultStorage) {

        let center = NotificationCenter.default

        center.addObserver(forName: .UIApplicationWillEnterForeground, object: nil, queue: nil) { _ in

            Swen.post(ApplicationWillEnterForeground(), in: storage)
        }
    }
}

class TestViewController: UIViewController {

    var swenStorage = SwenStorage()
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        //register for incoming events in custom storage
        Swen<TestEvent>.register(self, in: swenStorage) { event in
            print(event.name)
        }

        //register for incoming events in default storage
        Swen<TestEvent>.register(self) { event in
            print(event.name)
        }

        //post event in custom storage
        Swen.post(TestEvent(name: "Sixt, custom storage"), in: swenStorage)

        //post event in default storage
        Swen.post(TestEvent(name: "Sixt, default storage"))
    }
}