update demo app

CoreStoreDemo/CoreStoreDemo/Base.lproj/Main.storyboard

@@ -682,6 +682,9 @@
                     <nil key="simulatedBottomBarMetrics"/>
                     <connections>
                         <outlet property="bottomContainerView" destination="6So-f3-4Gp" id="C7O-e2-k0l"/>
+                        <outlet property="stackView" destination="cce-yT-4dn" id="r5B-BT-mUM"/>
+                        <outlet property="toggleBottomBarButtonItem" destination="aPM-OC-EB8" id="kEV-gg-XOX"/>
+                        <outlet property="toggleTopBarButtonItem" destination="6q3-Zk-A9p" id="usC-Zu-DQm"/>
                         <outlet property="topContainerView" destination="L5f-tW-lXf" id="DRV-mm-rBY"/>
                     </connections>
                 </viewController>
@@ -900,7 +903,7 @@
             <objects>
                 <collectionViewController id="EKY-1g-ALK" customClass="CollectionViewDemoViewController" customModule="CoreStoreDemo" customModuleProvider="target" sceneMemberID="viewController">
                     <collectionView key="view" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" dataMode="prototypes" id="hx3-j3-Q80">
-                        <rect key="frame" x="0.0" y="0.0" width="375" height="311"/>
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="311.5"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <color key="backgroundColor" systemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
                         <collectionViewFlowLayout key="collectionViewLayout" automaticEstimatedItemSize="YES" minimumLineSpacing="10" minimumInteritemSpacing="10" id="X6n-f9-yEl">
@@ -961,6 +964,9 @@
                         </connections>
                     </collectionView>
                     <navigationItem key="navigationItem" title="LiveList" id="goy-Zu-94A"/>
+                    <connections>
+                        <segue destination="dX3-kR-CYC" kind="show" identifier="ObjectObserverDemoViewController" id="k4E-dJ-1lz"/>
+                    </connections>
                 </collectionViewController>
                 <placeholder placeholderIdentifier="IBFirstResponder" id="Fmi-gN-RXz" userLabel="First Responder" customClass="UIResponder" sceneMemberID="firstResponder"/>
             </objects>
@@ -1170,4 +1176,7 @@
     <resources>
         <image name="second" width="30" height="30"/>
     </resources>
+    <inferredMetricsTieBreakers>
+        <segue reference="k4E-dJ-1lz"/>
+    </inferredMetricsTieBreakers>
 </document>

CoreStoreDemo/CoreStoreDemo/List and Object Observers Demo/ListObserverDemoViewController.swift

@@ -12,7 +12,32 @@ import CoreStore
 
 // MARK: - ListObserverDemoViewController
 
-class ListObserverDemoViewController: UITableViewController {
+final class ListObserverDemoViewController: UITableViewController {
+
+    // MARK: - EditableDataSource
+
+    final class EditableDataSource: DiffableDataSource.TableView<Palette> {
+
+        override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
+
+            switch editingStyle {
+
+            case .delete:
+                let palette = ColorsDemo.palettes[indexPath: indexPath]
+                ColorsDemo.stack.perform(
+                    asynchronous: { (transaction) in
+
+                        transaction.delete(palette)
+                    },
+                    completion: { _ in }
+                )
+
+            default:
+                break
+            }
+        }
+    }
+
     
     // MARK: UIViewController
 
@@ -51,7 +76,7 @@ class ListObserverDemoViewController: UITableViewController {
         ]
         self.filterBarButton = filterBarButton
 
-        self.dataSource = DiffableDataSource.TableView<Palette>(
+        self.dataSource = EditableDataSource(
             tableView: self.tableView,
             dataStack: ColorsDemo.stack,
             cellProvider: { (tableView, indexPath, palette) in
@@ -101,25 +126,6 @@ class ListObserverDemoViewController: UITableViewController {
         )
     }
     
-    override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
-        
-        switch editingStyle {
-            
-        case .delete:
-            let palette = ColorsDemo.palettes[indexPath: indexPath]
-            ColorsDemo.stack.perform(
-                asynchronous: { (transaction) in
-                    
-                    transaction.delete(palette)
-                },
-                completion: { _ in }
-            )
-            
-        default:
-            break
-        }
-    }
-    
     
     // MARK: Private
     

CoreStoreDemo/CoreStoreDemo/List and Object Observers Demo/ObserversViewController.swift

@@ -31,16 +31,29 @@ class ObserversViewController: UIViewController {
     
     // MARK: Private
 
+    @IBOutlet private dynamic weak var toggleTopBarButtonItem: UIBarButtonItem?
+    @IBOutlet private dynamic weak var toggleBottomBarButtonItem: UIBarButtonItem?
+    @IBOutlet private dynamic weak var stackView: UIStackView?
     @IBOutlet private dynamic weak var topContainerView: UIView?
     @IBOutlet private dynamic weak var bottomContainerView: UIView?
     
     @IBAction private dynamic func toggleTopContainerView() {
 
-        self.topContainerView?.isHidden.toggle()
+        UIView.animate(withDuration: 0.2) {
+
+            self.topContainerView!.isHidden.toggle()
+        }
+        self.toggleTopBarButtonItem!.isEnabled = !self.bottomContainerView!.isHidden
+        self.toggleBottomBarButtonItem!.isEnabled = !self.topContainerView!.isHidden
     }
     
     @IBAction private dynamic func toggleBottomContainerView() {
 
-        self.bottomContainerView?.isHidden.toggle()
+        UIView.animate(withDuration: 0.2) {
+
+            self.bottomContainerView!.isHidden.toggle()
+        }
+        self.toggleTopBarButtonItem!.isEnabled = !self.bottomContainerView!.isHidden
+        self.toggleBottomBarButtonItem!.isEnabled = !self.topContainerView!.isHidden
     }
 }

Sources/DiffableDataSource.TableView.swift

@@ -215,6 +215,21 @@ extension DiffableDataSource {
 //            }
         }
 
+        @objc
+        open dynamic func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
+
+            return true
+        }
+
+        @objc
+        open dynamic func tableView(_ tableView: UITableView, editingStyleForRowAt indexPath: IndexPath) -> UITableViewCell.EditingStyle {
+
+            return .delete
+        }
+
+        @objc
+        open dynamic func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {}
+
 
         // MARK: Private