A simple and type-safe facade for NSNotification with custom payload.

Allows decoupling application parts while communicating and exchanging data and easily.

• Simple and swift-sytle syntax
• No more magic strings for event names
• Strongly typed user data
• No more boilerplate code

To use EventBus on any class, just import EventBus and adopt BusUserprotocol.

Here is a simple (useless) example that registers to an event and posts it:

import EventBus

struct UserDidLoginEvent {
    let userName: String
}

class TestNotification: BusUser {
    init() {
        defaultBus.registerForEvent(UserDidLoginEvent.self) {
            (event: UserDidLoginEvent) in
            print("User name is \(event.userName)")
        }

        // Prints "User name is User1"
        defaultBus.postEvent(UserDidLoginEvent(userName: "User1"))
    }
}

An event is a simple class or structure, which name describes what it is (UserDidLogin or UserDidRegisterToNewsletter for example). Events can have members (to allow sending data along with it) or not. Here is how to declare an event:

// An event with payload, to allow passing user name when user has logged in
struct UserDidLoginEvent {
    let userName: String
}

If you do not have any payload, your event class can be a simple empty structure:

// A simple event with no payload
struct UserDidLogoutEvent {}

Here is how to post instances of former events:

defaultBus.postEvent(UserDidLoginEvent(userName: "User1"))

defaultBus.postEvent(UserDidLogoutEvent())

Here is how to register to an event:

defaultBus.registerForEvent(UserDidLoginEvent.self) {
    (event: UserDidLoginEvent) in
    print("User name is \(event.userName)")
}

If the event does not have any payload, or you don't need to access it, you can use the short version:

defaultBus.registerForEvent(UserDidLogoutEvent.self) {
    print("User did logout)")
}

To avoid memory leaks, you must unregister from registered events:

defaultBus.unregisterForEvent(UserDidLoginEvent.self)

You can also unregister from all registered events:

defaultBus.unregisterForAllEvents()

• iOS 8.0+ / Mac OS X 10.9+ / watchOS 2
• Xcode 7.0+

To integrate EventBus into your Xcode project using Carthage, specify it in your Cartfile:

github "benjamincombes/EventBus"