Add sample project.

CoreDataCombineSwiftUI.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

CoreDataCombineSwiftUI/AppDelegate.swift

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+//
+//  AppDelegate.swift
+//  CoreDataCombineSwiftUI
+//
+//  Created by Toomas Vahter on 13.01.2020.
+//  Copyright © 2020 Augmented Code. All rights reserved.
+//
+
+import UIKit
+import CoreData
+
+@UIApplicationMain
+class AppDelegate: UIResponder, UIApplicationDelegate {
+    lazy private(set) var dependencyContainer = DependencyContainer()
+
+    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
+        return true
+    }
+
+    // MARK: UISceneSession Lifecycle
+
+    func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
+        // Called when a new scene session is being created.
+        // Use this method to select a configuration to create the new scene with.
+        return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
+    }
+
+    func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {
+        // Called when the user discards a scene session.
+        // If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
+        // Use this method to release any resources that were specific to the discarded scenes, as they will not return.
+    }
+}
+

CoreDataCombineSwiftUI/Assets.xcassets/AppIcon.appiconset/Contents.json

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+{
+  "images" : [
+    {
+      "idiom" : "iphone",
+      "size" : "20x20",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "20x20",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "29x29",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "29x29",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "40x40",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "40x40",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "60x60",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "60x60",
+      "scale" : "3x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "20x20",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "20x20",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "29x29",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "29x29",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "40x40",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "40x40",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "76x76",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "76x76",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "83.5x83.5",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "ios-marketing",
+      "size" : "1024x1024",
+      "scale" : "1x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

CoreDataCombineSwiftUI/Assets.xcassets/Contents.json

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+{
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

CoreDataCombineSwiftUI/Base.lproj/LaunchScreen.storyboard

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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="13122.16" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13104.12"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" xcode11CocoaTouchSystemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
+                        <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="53" y="375"/>
+        </scene>
+    </scenes>
+</document>

CoreDataCombineSwiftUI/ColorItem.swift

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+//
+//  ColorItem.swift
+//  CoreDataCombineSwiftUI
+//
+//  Created by Toomas Vahter on 13.01.2020.
+//  Copyright © 2020 Augmented Code. All rights reserved.
+//
+
+import CoreData
+
+final class ColorItem: NSManagedObject {
+    @NSManaged var hex: String
+}
+
+extension ColorItem {
+    static func randomHex() -> String {
+        let characters = "0123456789ABCDEF"
+        return "#" + (0..<6).map({ _ in characters.randomElement()! })
+    }
+}
+
+extension ColorItem {
+    static let entityName = "ColorItem"
+
+    convenience init(context: NSManagedObjectContext) {
+        let entity = NSEntityDescription.entity(forEntityName: Self.entityName, in: context)!
+        self.init(entity: entity, insertInto: context)
+    }
+
+    static func makeRequest() -> NSFetchRequest<ColorItem> {
+        return NSFetchRequest<ColorItem>(entityName: entityName)
+    }
+
+    static func resultsController(context: NSManagedObjectContext, sortDescriptors: [NSSortDescriptor] = []) -> NSFetchedResultsController<ColorItem> {
+        let request = makeRequest()
+        request.sortDescriptors = sortDescriptors.isEmpty ? nil : sortDescriptors
+        return NSFetchedResultsController(fetchRequest: request, managedObjectContext: context, sectionNameKeyPath: nil, cacheName: nil)
+    }
+}

CoreDataCombineSwiftUI/ContentView.swift

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+//
+//  ContentView.swift
+//  CoreDataCombineSwiftUI
+//
+//  Created by Toomas Vahter on 13.01.2020.
+//  Copyright © 2020 Augmented Code. All rights reserved.
+//
+
+import Combine
+import SwiftUI
+
+struct ContentView: View {
+    @ObservedObject var viewModel: ViewModel
+
+    var body: some View {
+        NavigationView {
+            VStack {
+                List(viewModel.colors, id: \.objectID) { (colorItem) in
+                    Cell(colorItem: colorItem).onTapGesture {
+                        self.viewModel.selectedColorItem = colorItem
+                    }
+                }
+                if viewModel.selectedColorItem != nil {
+                    SelectedColorView(colorItem: viewModel.selectedColorItem!).frame(minHeight: 50, maxHeight: 50)
+                }
+            }.navigationBarTitle("Colors")
+                .navigationBarItems(trailing: trailingBarItem)
+        }
+    }
+
+    private var trailingBarItem: some View {
+        Button(action: viewModel.addRandomColor, label: {
+            Text("Add")
+        })
+    }
+}
+
+struct Cell: View {
+    @ObservedObject var colorItem: ColorItem
+
+    var body: some View {
+        HStack {
+            Text(verbatim: colorItem.hex)
+            Spacer()
+            Rectangle().foregroundColor(Color(colorItem.uiColor)).frame(minWidth: 50, maxWidth: 50)
+        }
+    }
+}
+
+struct ContentView_Previews: PreviewProvider {
+    static let dependencyContainer = DependencyContainer()
+
+    static var previews: some View {
+        let context = dependencyContainer.persistentContainer.viewContext
+        let viewModel = ContentView.ViewModel(managedObjectContext: context)
+        return ContentView(viewModel: viewModel)
+    }
+}