Reactive + Automaton + VTree in Swift, inspired by Elm.
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Reactive + Automaton + VTree in Swift, inspired by Elm.

Note: This library is only a 100 lines of code.


// main.swift

import UIKit
import VTree
import SwiftElm

enum Msg: AutoMessage {
    case increment
    case decrement

typealias Model = Int

func update(state: Model, input: Msg) -> Model? {
    switch input {
        case .increment:
            return state + 1
        case .decrement:
            return state - 1

func view(_ model: Model) -> VView<Msg> {
    return VView(children: [
        *VLabel(text: "\(model)"),
        *VButton(title: "+", handlers: [.touchUpInside : .increment]),
        *VButton(title: "-", handlers: [.touchUpInside : .decrement]),

// App main entrypoint (using `UIApplicationMain`).
appMain {
    return Program(model: 0, update: update, view: view)

Please see Demo Projects for more information.

Metaprogramming with Sourcery

SwiftElm uses Sourcery as Swift template metaprogramming engine to cover transcripting that elm-lang/core does when converting enum MyMsg to JavaScript.

Please see VTree/README.md for more information.


  • Evan Czaplicki: Creator of Elm



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