Add ability to reverse actions when perform two finger tap on screen.

CounterExample.xcodeproj/project.pbxproj

@@ -22,6 +22,8 @@
 		3C135C601D547F7700EC9FC9 /* AppState.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3C135C5F1D547F7700EC9FC9 /* AppState.swift */; };
 		3C135C651D55C92200EC9FC9 /* Actions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3C135C641D55C92200EC9FC9 /* Actions.swift */; };
 		3C135C671D55C94300EC9FC9 /* CounterReducer.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3C135C661D55C94300EC9FC9 /* CounterReducer.swift */; };
+		D20FA0FE1DD5D11B0054EA53 /* CounterExampleTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = D20FA0FD1DD5D11B0054EA53 /* CounterExampleTests.swift */; };
+		D20FA1071DD5DF480054EA53 /* Recorder.swift in Sources */ = {isa = PBXBuildFile; fileRef = D20FA1061DD5DF480054EA53 /* Recorder.swift */; };
 		63DC914B1DD5D41E009A8AB0 /* ReSwift.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 3C135C451D53E94C00EC9FC9 /* ReSwift.framework */; };
 		D20FA0FE1DD5D11B0054EA53 /* CounterReducerTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = D20FA0FD1DD5D11B0054EA53 /* CounterReducerTests.swift */; };
 /* End PBXBuildFile section */
@@ -69,6 +71,7 @@
 		D20FA0FB1DD5D11A0054EA53 /* CounterExampleTests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = CounterExampleTests.xctest; sourceTree = BUILT_PRODUCTS_DIR; };
 		D20FA0FD1DD5D11B0054EA53 /* CounterReducerTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CounterReducerTests.swift; sourceTree = "<group>"; };
 		D20FA0FF1DD5D11B0054EA53 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
+		D20FA1061DD5DF480054EA53 /* Recorder.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Recorder.swift; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -113,6 +116,7 @@
 		3C135C2E1D53E29400EC9FC9 /* CounterExample */ = {
 			isa = PBXGroup;
 			children = (
+				D20FA1051DD5DF380054EA53 /* Recorder */,
 				3C135C631D55C91800EC9FC9 /* Reducers */,
 				3C135C621D55C91300EC9FC9 /* State */,
 				3C135C611D55C90900EC9FC9 /* Actions */,
@@ -160,6 +164,14 @@
 			path = CounterExampleTests;
 			sourceTree = "<group>";
 		};
+		D20FA1051DD5DF380054EA53 /* Recorder */ = {
+			isa = PBXGroup;
+			children = (
+				D20FA1061DD5DF480054EA53 /* Recorder.swift */,
+			);
+			name = Recorder;
+			sourceTree = "<group>";
+		};
 /* End PBXGroup section */
 
 /* Begin PBXNativeTarget section */
@@ -274,6 +286,7 @@
 				3C135C671D55C94300EC9FC9 /* CounterReducer.swift in Sources */,
 				3C135C651D55C92200EC9FC9 /* Actions.swift in Sources */,
 				3C135C321D53E29400EC9FC9 /* ViewController.swift in Sources */,
+				D20FA1071DD5DF480054EA53 /* Recorder.swift in Sources */,
 				3C135C301D53E29400EC9FC9 /* AppDelegate.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;

CounterExample/Actions/Actions.swift

@@ -1,9 +1,20 @@
 import ReSwift
 
 // all of the actions that can be applied to the state
-struct CounterActionIncrease: Action {
+struct CounterActionIncrease: ReversableAction {
     let index: Int
+    func reversed() -> ReversableAction {
+        return CounterActionDecrease(index: index)
+    }
 }
-struct CounterActionDecrease: Action {
+
+struct CounterActionDecrease: ReversableAction {
     let index: Int
+    func reversed() -> ReversableAction {
+        return CounterActionIncrease(index: index)
+    }
+}
+
+protocol ReversableAction: Action {
+    func reversed() -> ReversableAction
 }

CounterExample/Base.lproj/Main.storyboard

@@ -61,12 +61,16 @@
                             </tableView>
                         </subviews>
                         <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                        <gestureRecognizers/>
                         <constraints>
                             <constraint firstItem="wfy-db-euE" firstAttribute="top" secondItem="eek-B8-JXY" secondAttribute="bottom" id="ZdA-RE-ofs"/>
                             <constraint firstAttribute="trailing" secondItem="eek-B8-JXY" secondAttribute="trailing" id="d7f-9z-9vc"/>
                             <constraint firstItem="eek-B8-JXY" firstAttribute="top" secondItem="y3c-jy-aDJ" secondAttribute="bottom" constant="-64" id="gwk-e7-74g"/>
                             <constraint firstItem="eek-B8-JXY" firstAttribute="leading" secondItem="8bC-Xf-vdC" secondAttribute="leading" id="yC9-9F-pZb"/>
                         </constraints>
+                        <connections>
+                            <outletCollection property="gestureRecognizers" destination="Vcq-Uj-qPr" appends="YES" id="eM7-B0-MHJ"/>
+                        </connections>
                     </view>
                     <navigationItem key="navigationItem" id="O1K-Td-Auc">
                         <barButtonItem key="rightBarButtonItem" systemItem="add" id="Zr1-8g-nfq">
@@ -80,6 +84,11 @@
                     </connections>
                 </viewController>
                 <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
+                <tapGestureRecognizer numberOfTouchesRequired="2" id="Vcq-Uj-qPr">
+                    <connections>
+                        <action selector="didTwoFingersTap:" destination="BYZ-38-t0r" id="LHF-Eg-ntJ"/>
+                    </connections>
+                </tapGestureRecognizer>
             </objects>
             <point key="canvasLocation" x="1244" y="386.35682158920542"/>
         </scene>

CounterExample/Recorder.swift

@@ -0,0 +1,30 @@
+//
+//  Recorder.swift
+//  CounterExample
+//
+//  Created by Bohdan Orlov on 11/11/2016.
+//  Copyright © 2016 Colin Eberhardt. All rights reserved.
+//
+
+import Foundation
+import ReSwift
+
+class Recorder {
+    var replayDelay: TimeInterval = 0.5
+    var actions = [ReversableAction]()
+    func record(_ action: ReversableAction) {
+        actions.append(action)
+    }
+
+    func replay() {
+        var tmpActions = [ReversableAction]()
+        for (idx, action) in actions.reversed().enumerated() {
+            DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + TimeInterval(Float(replayDelay) * Float(idx)), execute: {
+                mainStore.dispatch(action)
+
+            })
+            tmpActions.append(action.reversed())
+        }
+        actions = tmpActions
+    }
+}

CounterExample/ViewController.swift

@@ -10,11 +10,14 @@ import UIKit
 import ReSwift
 
 class ViewController: UIViewController, StoreSubscriber {
-
+    let recorder = Recorder()
     typealias StoreSubscriberStateType = AppState
 
     @IBOutlet weak var tableView: UITableView!
 
+    @IBAction func didTwoFingersTap(_ sender: Any) {
+        recorder.replay()
+    }
     override func viewDidLoad() {
         super.viewDidLoad()
 
@@ -48,13 +51,15 @@ extension ViewController : UITableViewDataSource {
         let cell = tableView.dequeueReusableCell(withIdentifier: "CounterCell", for: indexPath) as! CounterCell
         cell.label.text = "\(mainStore.state.counters[indexPath.row])"
         cell.action = { actionType in
-
+            let action: ReversableAction
             switch actionType {
             case .increase:
-                mainStore.dispatch(CounterActionIncrease(index: indexPath.row))
+                action = CounterActionIncrease(index: indexPath.row)
             case .decrease:
-                mainStore.dispatch(CounterActionDecrease(index: indexPath.row))
+                action = CounterActionDecrease(index: indexPath.row)
             }
+            mainStore.dispatch(action)
+            self.recorder.record(action.reversed())
         }
 
         return cell