Migrating iOS 13 app to 14: how to manage AppDelegate context code for CoreData?

Question

Created Jul ’20

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I'm in the middle of updating my app to only support iOS 14+ and am moving to the new @main app structure. I'm trying to figure out how to deal with code in my App and Scene Delegate: mainly code related to Core Data and CloudKit persistent container.

Stuff like

Code Block lazy var persistentContainer: NSPersistentCloudKitContainer = {...}

and

Code Block  let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
context.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy 
context.automaticallyMergesChangesFromParent = true

Where do I put this kind of stuff in the new @main world?

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Answer 1

rakeshfrompune OP

Jul ’20

You initialise the persistentContainer in the init method.

Code Block swiftstruct YourApp: App {
    var persistentContainer: NSPersistentContainer
    init() {
        let container = NSPersistentContainer(name: "YourApp")
        container.loadPersistentStores(completionHandler: { (storeDescription, error) in
            if let error = error as NSError? {
                fatalError("Unresolved error \(error), \(error.userInfo)")
            }
        })
        self.persistentContainer = container
    }
    var body: some Scene {
        WindowGroup {
            ContentView()
                .environment(\.managedObjectContext, persistentContainer.viewContext)
        }
    }
}

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