Final tweaks & slides

Playground/Classroom.playground/Pages/2. share.xcplaygroundpage/Contents.swift

@@ -70,7 +70,7 @@ example(of: "shareReplayLatestWhileConnected()", run: false) {
 // ------------------------------------------------------------------------------------
 // 4. share(replay:scope:)
 // ------------------------------------------------------------------------------------
-example(of: "share(replay:scope:)", run: false) {
+example(of: "share(replay:scope:)", run: true) {
 	let observable = Observable<Int>.timer(0, period: 1, scheduler: MainScheduler.instance)
 		.share(replay: 3, scope: .whileConnected)
 

RxFeedbackDemo/RxFeedbackDemo.xcodeproj/project.pbxproj

@@ -74,14 +74,14 @@
 		3D8FB31F1F6FA88900A4D2F6 /* RxFeedbackDemo */ = {
 			isa = PBXGroup;
 			children = (
-				3D8FB3201F6FA88900A4D2F6 /* AppDelegate.swift */,
+				3D8FB3321F6FAA9A00A4D2F6 /* PlaybackState.swift */,
+				3D8FB3341F6FAAE000A4D2F6 /* PlaybackCommand.swift */,
 				3D8FB3221F6FA88900A4D2F6 /* ViewController.swift */,
+				3D8FB3201F6FA88900A4D2F6 /* AppDelegate.swift */,
 				3D8FB3241F6FA88900A4D2F6 /* Main.storyboard */,
 				3D8FB3271F6FA88900A4D2F6 /* Assets.xcassets */,
 				3D8FB3291F6FA88900A4D2F6 /* LaunchScreen.storyboard */,
 				3D8FB32C1F6FA88900A4D2F6 /* Info.plist */,
-				3D8FB3321F6FAA9A00A4D2F6 /* PlaybackState.swift */,
-				3D8FB3341F6FAAE000A4D2F6 /* PlaybackCommand.swift */,
 			);
 			path = RxFeedbackDemo;
 			sourceTree = "<group>";

RxFeedbackDemo/RxFeedbackDemo/PlaybackState.swift

@@ -11,13 +11,13 @@ import Foundation
 //
 // PlaybackState: the possible states of our player state machine
 //
-enum PlaybackState: Equatable {
+enum PlaybackState {
 	case stopped
 	case playing(Int,Date)		// media index, end date
 	case paused(Int,Double)		// media index, remaining seconds
 }
 
-extension PlaybackState {
+extension PlaybackState: Equatable {
 	var isPaused: Bool {
 		if case .paused(_,_) = self { return true }
 		return false

RxFeedbackDemo/RxFeedbackDemo/ViewController.swift

@@ -97,7 +97,7 @@ class ViewController: UIViewController {
 				bindUI,
 
 				// Playback command generator that runs playback and loops on playlists
-				generateCommandsFromPlaybackState
+				generateCommandsFromPlaybackStates
 			]
 			)
 			.distinctUntilChanged()
@@ -127,8 +127,10 @@ class ViewController: UIViewController {
 		}
 	}
 
-	func generateCommandsFromPlaybackState(states: ObservableSchedulerContext<PlaybackState>) -> Observable<PlaybackCommand> {
-		return states.source.flatMapLatest { [weak self] (state: PlaybackState) -> Observable<PlaybackCommand> in
+	func generateCommandsFromPlaybackStates(states: ObservableSchedulerContext<PlaybackState>) -> Observable<PlaybackCommand> {
+		return states.source.flatMapLatest {
+			[weak self] (state: PlaybackState) -> Observable<PlaybackCommand> in
+
 			guard let this = self else { return .empty() }
 
 			switch state {

Slides/RxClassroom2017.md

@@ -1,6 +1,13 @@
-## RxSwift Classroom
+![fit](images/rxlogo.png)
+## [fit] RxSwift Classroom
 
-### FrenchKit 2017
+### [fit]           FrenchKit 2017
+
+Florent Pillet
+
+**@fpillet**
+
+Co-author, RxSwift book from Ray Wenderlich
 
 ---
 ## Agenda
@@ -77,7 +84,8 @@ When you only want to see the freshest results
 
 * Replays the last N emitted elements
 * Event if # subscribers fell to zero
-* Experiment with the playground!
+
+👉  Experiment with the playground!
 
 ---
 ### `shareReplayLatestWhileConnected`
@@ -92,6 +100,148 @@ When you only want to see the freshest results
 * Control whether buffering 'sticks' when subscribers drop to zero
 
 ---
-## Introducing RxFeedback
+# Introducing RxFeedback
+
+
+---
+# Introducing RxFeedback
+
+https://github.com/kzaher/RxFeedback
+
+`pod 'RxFeedback'`
+
+---
+### State machines
+
+* Describe states of a system
+* Transition description semantics
+* How do you describe feedback?
+
+---
+### Feedback?
+
+* A new state triggers a set of inputs
+* Inputs produce events, sooner of later
+* Events can be turned into a new state
+
+---
+### RxFeedback: all-in-one solution
+
+![inline](images/RxFeedback.png)
+
+---
+### RxFeedback: all-in-one solution
+
+* Describes the entire system: reducer, inputs, events
+* Flexible inputs adjusting for each state
+* Model circular dependencies
+
+---
+### Example project
+
+* Simple media player to cycle between images
+* A few states, easy to understand
+
+👉 open `RxFeedbackDemo` project
+👉 run app
+
+---
+### States & events
+
+* I named events 'commands', better suited to this project
+
+👉 examine `PlaybackStates.swift`
+👉 examine `PlaybackCommand.swift`
+
+---
+### RxFeedback: a single operator (mostly)
+
+* `Observable.system`
+* Describes a complete system
+* Event reducer
+* Scheduler
+* Feedback loops
+
+---
+### Reducer
+
+* Barbaric name for a simple concept
+* Reduces a command to a new state
+* Try resist performing side effects here
+
+---
+### Reducer
+
+* `reducePlaybackStateFromCommand` function
+* simple switch-case clearly describes what happens
+
+---
+### Scheduler
+
+* Use an asynchronous scheduler
+* Prevents issue when doing immediate transitions
+* RxFeedback does it for you, mostly
+
+---
+### Feedback loops
+
+* One or more closures, called only *once*
+* Observe a sequence of states
+* Produce a sequence of comments
+
+---
+### Feedback loops
+
+* `generateCommandsFromPlaybackStates`
+* Observe the sequence of states
+* On change, produce either `empty()` (empty sequence)
+* ... or a timer that triggers to play the next image
+
+---
+### Feedback loops
+
+* `flatMapLatest` 💪
+
+---
+### UI binding
+
+* `bindUI`
+* 😱
+* Convoluted but not that complicated
+
+
+---
+### UI binding
+
+* "observers" update UI from state
+* "emitters" produce commands from user input
+* commands go feed the beast
+
+---
+### Putting it all together
+
+* Initial state goes into feedback loop
+* Our example does nothing
+* "Play" button triggers initial `playing` state
+* `playing` initiates timer
+* `playing` enables `pause` button
+* It all goes on from
 
 ---
+# Final words
+
+
+---
+# [fit] Discussion / Q&A
+
+
+
+
+I'm Florent Pillet
+
+**@fpillet** on Twitter, Slack, gmail and everywhere else
+
+
+
+Co-author, RxSwift book from Ray Wenderlich
+[https://store.raywenderlich.com/products/rxswift](https://store.raywenderlich.com/products/rxswift)