RxBus

Event bus framework supports sticky events and subscribers priority based on RxSwift.

Requirements

• Xcode 10.2+
• Swift 5.0+
• iOS 9.0+
• macOS 10.10+
• tvOS 9.0+

Installation

Swift Package Manager

dependencies: [
    .package(url: "https://github.com/ridi/RxBus-swift.git", .upToNextMinor(from: "0.1.0"))
]

Usage

Imports

import RxBus
import RxSwift

Defining Events struct

// Defining Events struct
struct Events {
    struct LoggedIn: BusEvent {
        let userId: String
    }
    struct LoggedOut: BusEvent { }
    struct Purchased: BusEvent {
        let tid: Int
    }
}

Event subscription/posting

RxBus.shared.asObservable(event: Events.LoggedIn.self).subscribe { event in
    print("LoggedIn, userId = \(event.element!.userId)")
}.disposed(by: disposeBag)
RxBus.shared.post(event: Events.LoggedIn(userId: "davin.ahn"))

LoggedIn, userId = davin.ahn

Sticky events

RxBus.shared.post(event: Events.LoggedOut(), sticky: true)
RxBus.shared.asObservable(event: Events.LoggedOut.self, sticky: true).subscribe { _ in
    print("LoggedOut")
}.disposed(by: disposeBag)

LoggedOut

Subscription priority

RxBus.shared.asObservable(event: Events.Purchased.self, sticky: false, priority: -1).subscribe { event in
    print("Purchased(priority: -1), tid = \(event.element!.tid)")
}.disposed(by: disposeBag)
RxBus.shared.asObservable(event: Events.Purchased.self, sticky: false, priority: 1).subscribe { event in
    print("Purchased(priority: 1), tid = \(event.element!.tid)")
}.disposed(by: disposeBag)
RxBus.shared.asObservable(event: Events.Purchased.self).subscribe { event in
    print("Purchased(priority: 0 = default), tid = \(event.element!.tid)")
}.disposed(by: disposeBag)
RxBus.shared.post(event: Events.Purchased(tid: 1001))

Purchased(priority: 1), tid = 1001
Purchased(priority: 0 = default), tid = 1001
Purchased(priority: -1), tid = 1001

System Notification subscription

RxBus.shared.asObservable(notificationName: UIResponder.keyboardWillShowNotification).subscribe { event in
    print("\(event.element!.name.rawValue), userInfo: \(event.element!.userInfo)")
}.disposed(by: disposeBag)
textField.becomeFirstResponder()

UIKeyboardWillShowNotification, userInfo: [AnyHashable("UIKeyboardAnimationCurveUserInfoKey"): 7, AnyHashable("UIKeyboardCenterEndUserInfoKey"): NSPoint: {207, 745.5}, AnyHashable("UIKeyboardFrameBeginUserInfoKey"): NSRect: {{0, 896}, {414, 54}}, AnyHashable("UIKeyboardFrameEndUserInfoKey"): NSRect: {{0, 595}, {414, 301}}, AnyHashable("UIKeyboardBoundsUserInfoKey"): NSRect: {{0, 0}, {414, 301}}, AnyHashable("UIKeyboardIsLocalUserInfoKey"): 1, AnyHashable("UIKeyboardAnimationDurationUserInfoKey"): 0.25, AnyHashable("UIKeyboardCenterBeginUserInfoKey"): NSPoint: {207, 923}]

Defining Custom Notification

extension Notification.Name {
    static let Custom = Notification.Name("CustomNotification")
}

Custom Notification subscription/posting

RxBus.shared.asObservable(notificationName: .Custom).subscribe { event in
    print("\(event.element!.name.rawValue), userInfo: \(event.element!.userInfo)")
}.disposed(by: disposeBag)
RxBus.shared.post(notificationName: .Custom, userInfo: ["message": "Hi~"])

Custom, userInfo: [AnyHashable("message"): "Hi~"]

Sticky Notifications

RxBus.shared.post(notificationName: .Custom, userInfo: ["value": 5], sticky: true)
RxBus.shared.asObservable(notificationName: .Custom, sticky: true).subscribe { event in
    print("\(event.element!.name.rawValue), userInfo: \(event.element!.userInfo)")
}.disposed(by: disposeBag)

Custom, userInfo: [AnyHashable("value"): 5]