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Core Data is Apple's object modeling and persistence framework for iOS, iPadOS, tvOS, watchOS, and macOS. Xcode provides an object model editor for specifying entities, attributes, and relationships.

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I'm taking a class to try to learn iOS programming, and am working on a class project related to Core Data, filtering, and sorting. The class is doing a poor job teaching, but I'm close. I don't want ...
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I'm using NSPersistentCloudKitContainer and I have added an entity (to the private database) to the core data model. Now I have realised that I don't need that ...
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I'm testing SwiftData model inheritance (new in iOS 26) and encountering a crash when combining: A model that inherits from another model A separate model with relationships to the parent class ...
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If I save data in my CoreData app, I get the following info in my Xcode console: cannot open file at line 42184 of [554764a6e7] os_unix.c:42184: (0) openDirectory(/Users/christiankrueger/Documents/...
Christian Krueger's user avatar
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I have the following CoreData stack in my app: ...
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I have a CoreData entity Topic which has a one-to-many relationship to Question (questions ...
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In my App.xcdatamodeld I have an entity called File. When I am building the project with Xcode, file FileEntity+CoreDataProperties.swift is generated. After upgrading Xcode to version 26.0 (17A324), I ...
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I’m building a Swift app that uses CoreData (SQLite) for local data storage. When a user sets up a new iPhone via Quick Start (device-to-device transfer), the app’s Core Data database is transferred ...
m-ogawa's user avatar
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I have a view model with a published array foodItems, containing the data for a List in the related parent View. The array is initially filled from CoreData by ...
Ulrich's user avatar
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I'm working with SwiftData and trying to replicate behavior similar to what I used to do with CoreData, where I had an extension ...
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I understand managed objects are not thread safe with Core Data, so if you need to access their properties on a different thread you need to get a new managed object via the ...
Jordan H's user avatar
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I am developing a Screen Time App for iOS and I am having issues with the ShieldConfigurationExtension (...
Lukáš Matuška's user avatar
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I’m using Core Data in a macOS app and performing most work in a background context. However, I’d like to take advantage of Core Data’s built-in undo functionality and I’m struggling with how to ...
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How to migrate if the following problem occurs? The current Coredata and CloudKit database contains records which do not use allowCloudEncryption. Since we thought of advanced data protection for user'...
FE_Tech's user avatar
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I have a grid setup where I'm displaying multiple images which is working fine. Images are ordered by the date they're added, newest to oldest. I'm trying to set it up so that the user can change the ...
Ceri Turner's user avatar
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I'm using Core Data in my iOS application, and I want to encrypt some string properties using AES with a key that is generated and saved in the keychain. I'm using ValueTransformer to encrypt/decrypt ...
YosiFZ's user avatar
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I have a large list of book entities shown in a SwiftUI list (Around 10k to 50k books). I want to capture the ids of the list of books in the array in order when the user tap a list row. The issue is ...
User95797654974's user avatar
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In Core Data, I use the following code to fetch all entities with a name: ...
koen's user avatar
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A user has accidentally deleted a root record that removes all data from the user. The data is stored in Cloudkit CoreData with Transaction History enabled. I have noticed in the CoreData database ...
user14341201's user avatar
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I need to know the source of the changed coredata objects returned from NSManagedObjectContextObjectsDidChange. I have some shared objects, and want to send a notification if the source is other than ...
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In core-data I have a contact and location entity. I have one-to-many relationship from contact to locations and one-to-one from location to contact. I create contact in a seperate view and save it. ...
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I am trying to save a screenshot to my app using an action extension directly from the screenshot thumbnail you see as soon as you take a screenshot but the method loadItem(forTypeIdentifier:options:...
Abdullah Ajmal's user avatar
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Swift 5 How to resolve warnings: 'Sending value of non-Sendable type '() throws -> ()' risks causing data races; this is an error in the Swift 6 language mode' for this code: ...
john07's user avatar
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I am new to CoreData but I made an object that I intend to use an array of within a ForEach loop in SwiftUI. In the entity editor I added a UUID attribute stored_id....
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I am getting crash 'Can not save Object with references outside of their own stores' while decoding NSManagedObject. Here is the detail. I have two NSManagedObjects. Parent: FitnessWrapper and Child: ...
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This is my definition of Model for SwiftData: ...
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Here is my @FetchRequest for User entity: ...
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I have setup push notifications and updates in CK are updating UI well. The issue I have is Syncing between Core Data and CK. It's set to use NSPersistentCloudKitContainer with ...
drewglew's user avatar
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I'm using SwiftData in my SwiftUI iOS app, and I need to implement a MigrationPlan before launching, so things go smoothly later when I need to make changes to the ...
pez's user avatar
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I would like to create a temporary BOOL property in a custom NSManagedObject class to track whether an async download of a remote image is underway so as not to start a second download while the first ...
user6631314's user avatar
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I have a project with 3 targets: main application an extension framework (with coredata management for sharing with main app and extension) I set App Groups for main app and extension. When I trying ...
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In my app, I've been using ModelActors in SwiftData, and using actors with a custom executor in Core Data to create concurrency safe services. I have multiple actor services that relate to different ...
Jordan Ellis's user avatar
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The ios app works when hooked to a mac and run in debug mode, sometimes it fails. When I clean and rebuild it works for sometime and then fails again. Also if I start the app sometimes it works, ...
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I am trying to loop through an array of ManagedObjects in Swift (that should have just one item) and am getting an error at runtime of Thread 57: Fatal error: NSArray element failed to match the ...
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I have an entity with an attribute called "plainText" which stores text of type "String". I want to fetch the objects based on a custom sort descriptor which is used in ...
FE_Tech's user avatar
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-2 votes
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What is the right approach to seed Core Data database at the first launch? I have sql db with precreated data. I need to make this data available to the user at the app's first launch and then delete ...
Danil's user avatar
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I am trying to build a graph of words, where each word has a relationship to each word with the same letters plus one, like for example : ...
Simon W's user avatar
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I wasn't sure how to phrase the question. I know it's misleading. Context: I'm using NSPersistentCloudKitContainer for my public and private database. The CoreData model has two configurations: Local, ...
Jonathan's user avatar
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I have a Core Data project, with my SwiftUI view hooked on to different properties of the attributes in the model, and the change tracking works great. I want to add a simple boolean property to my ...
Z S's user avatar
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Let's say I have a Person entity with various attributes of which one of its attributes has a uniqueness constraint so that there are no duplicate ...
user10711707's user avatar
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1 answer
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I have one-to-many relationship in CoreData defined in the following way: ...
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I have Library and Books entities where one library can contain many books where the relationship is an inherently ordered one in my app since the user can store the books in whatever order they want ...
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Consider this CoreData stack written for Swift 5.10 ...
tospig's user avatar
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I have a SwiftUI view that I want to move the fetch request in a view model. For normal fetching I did it like this Consider this model ...
s_diaconu's user avatar
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I'm inserting hundreds of thousands of objects using NSBatchInsert, now i want to add relationships between objects (let say A and B, with 1-to-many relationship) as no batch operation supports ...
Red Mak's user avatar
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I have a CoreData entity called Item, which may or may not contain Properties. I would like to fetch all Items that have not yet ...
zkvvoob's user avatar
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I'm having an error at runtime related to the UUID in my code. Let me explain whats attached. Below are the Persistence Controller, DeflectionLogEntity, DeflectionLogViewModel, and the main issue, ...
Drew Hengehold's user avatar
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I'm using Core Data in my iOS application and I have one property that is encrypted using ValueTransformer: ...
YosiFZ's user avatar
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1 vote
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My iOS app can change account. SQLite file is saved to [account]_dbfile.sqlite. If I logged in ABC named account, call CoreDataManager.shared.setup("ABC") ...
strawnut's user avatar
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Is it possible to apply a NSSortDescriptor that investigates two (or more!) keys while fetching from Core Data? Currently we fetch the objects and sort them in ...
AVS's user avatar
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