Starter

PairGenrator/PairGenrator.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>

PairGenrator/PairGenrator/Model/CoreData.swift

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+//
+//  CoreData.swift
+//  PairGenrator
+//
+//  Created by Hin Wong on 4/10/20.
+//  Copyright © 2020 Hin Wong. All rights reserved.
+//
+
+import Foundation
+import CoreData
+
+enum CoreDataStack {
+
+    //MARK: - Core data stack
+    static let container: NSPersistentContainer = {
+        let container = NSPersistentContainer(name: "PairGenrator")
+        container.loadPersistentStores { (_, error) in
+            if let error = error {
+                fatalError("Failed to load persistet stores \(error)")
+            }
+        }
+        return container
+    } ()
+
+    static var context: NSManagedObjectContext {
+        return container.viewContext
+    }
+
+    //MARK: - Core data saving
+
+    static func saveContext () {
+          let context = CoreDataStack.context
+          if context.hasChanges {
+              do {
+                  try context.save()
+              } catch {
+                  let nserror = error as NSError
+                  fatalError("Unresolved error saving Core Data context:\n\(nserror), \(nserror.userInfo)")
+              }
+          }
+      }
+}
+

PairGenrator/PairGenrator/Model/Person+Convenience.swift

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+//
+//  Person+Convenience.swift
+//  PairGenrator
+//
+//  Created by Hin Wong on 4/10/20.
+//  Copyright © 2020 Hin Wong. All rights reserved.
+//
+
+import Foundation
+import CoreData
+
+extension Person {
+    @discardableResult
+    convenience init(name: String, context: NSManagedObjectContext = CoreDataStack.context) {
+        self.init(context: context)
+        self.name = name
+    }
+}

PairGenrator/PairGenrator/ModelController/PersonController.swift

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+//
+//  PersonController.swift
+//  PairGenrator
+//
+//  Created by Hin Wong on 4/10/20.
+//  Copyright © 2020 Hin Wong. All rights reserved.
+//
+
+import Foundation
+import CoreData
+
+class PersonController {
+
+    //MARK: - Properties
+    static let shared = PersonController()
+
+    var persons: [Person] {
+        let fetchRequest: NSFetchRequest<Person> = Person.fetchRequest()
+        return (try? CoreDataStack.context.fetch(fetchRequest)) ?? []
+    }
+
+    //MARK: - CRUD Functions
+
+    func createPerson(name: String) {
+        Person(name: name)
+        CoreDataStack.saveContext()
+    }
+
+    func updatePerson(person: Person, name: String) {
+        person.name = name
+        CoreDataStack.saveContext()
+    }
+
+    func deletePerson(person: Person) {
+        CoreDataStack.context.delete(person)
+        CoreDataStack.saveContext()
+    }
+
+    //MARK: - Helper Functions
+
+    //TODO: - Potential error
+
+    func pairingUp() -> [[Person]]{
+        let randomPairs = persons.shuffled()
+
+        var pairs = [[Person]]()
+        var pair = [Person]()
+
+        for person in randomPairs {
+            if pair.count == 0 {
+                pair.append(person)
+            } else {
+                pair.append(person)
+                pairs.append(pair)
+                pair = [Person]()
+            }
+
+        }
+
+        if pair.count != 0 {
+            pairs.append(pair)
+        }
+
+        return pairs
+    }
+
+}//End of class

PairGenrator/PairGenrator/PairGenrator.xcdatamodeld/.xccurrentversion

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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>_XCCurrentVersionName</key>
+	<string>PairGenrator.xcdatamodel</string>
+</dict>
+</plist>

PairGenrator/PairGenrator/PairGenrator.xcdatamodeld/PairGenrator.xcdatamodel/contents

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+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<model type="com.apple.IDECoreDataModeler.DataModel" documentVersion="1.0" lastSavedToolsVersion="16119" systemVersion="19E266" minimumToolsVersion="Automatic" sourceLanguage="Swift" userDefinedModelVersionIdentifier="">
+    <entity name="Person" representedClassName="Person" syncable="YES" codeGenerationType="class">
+        <attribute name="name" optional="YES" attributeType="String"/>
+    </entity>
+    <elements>
+        <element name="Person" positionX="-54" positionY="-9" width="128" height="58"/>
+    </elements>
+</model>

PairGenrator/PairGenrator/Resource/AppDelegate.swift

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+//
+//  AppDelegate.swift
+//  PairGenrator
+//
+//  Created by Hin Wong on 4/10/20.
+//  Copyright © 2020 Hin Wong. All rights reserved.
+//
+
+import UIKit
+import CoreData
+
+@UIApplicationMain
+class AppDelegate: UIResponder, UIApplicationDelegate {
+
+
+
+    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
+        // Override point for customization after application launch.
+        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.
+    }
+
+    // MARK: - Core Data stack
+
+    lazy var persistentContainer: NSPersistentContainer = {
+        /*
+         The persistent container for the application. This implementation
+         creates and returns a container, having loaded the store for the
+         application to it. This property is optional since there are legitimate
+         error conditions that could cause the creation of the store to fail.
+        */
+        let container = NSPersistentContainer(name: "PairGenrator")
+        container.loadPersistentStores(completionHandler: { (storeDescription, error) in
+            if let error = error as NSError? {
+                // Replace this implementation with code to handle the error appropriately.
+                // fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
+
+                /*
+                 Typical reasons for an error here include:
+                 * The parent directory does not exist, cannot be created, or disallows writing.
+                 * The persistent store is not accessible, due to permissions or data protection when the device is locked.
+                 * The device is out of space.
+                 * The store could not be migrated to the current model version.
+                 Check the error message to determine what the actual problem was.
+                 */
+                fatalError("Unresolved error \(error), \(error.userInfo)")
+            }
+        })
+        return container
+    }()
+
+    // MARK: - Core Data Saving support
+
+    func saveContext () {
+        let context = persistentContainer.viewContext
+        if context.hasChanges {
+            do {
+                try context.save()
+            } catch {
+                // Replace this implementation with code to handle the error appropriately.
+                // fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
+                let nserror = error as NSError
+                fatalError("Unresolved error \(nserror), \(nserror.userInfo)")
+            }
+        }
+    }
+
+}
+

PairGenrator/PairGenrator/Resource/Assets.xcassets/AppIcon.appiconset/Contents.json

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

PairGenrator/PairGenrator/Resource/Assets.xcassets/Contents.json

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