The model is a collection of entity description objects(instance of NSEntityDescription). An object graph is nothing more than a collection of objects that are connected with one another. ♥♥️♥️When you retrieve an object from an NSManagedObjectContext (MOC) you can’t tell (in the normal course of its use) whether it’s a fault or a realized object*** — Yes we can, use –isFault. Interview Questions Interactive Review Test your Swift Find a Job Store. It's the Model in the Model-View-Controller pattern that permeates the iOS SDK. For example:- to insert a new managed object into a managed object context, it’s a class method. NSManagedObjectContext has perform(_:) and performAndWait(_:) to direct work to the correct queue. The Overflow Blog Want to teach your kids to code? It provides generalized and automated solutions to common tasks associated with object life cycle and object graph management, including persistence. What is Faulting mechanism in Core Data? For example:- a Manager can have a to-many relationship with a set of employees, whereas an individual Employee will usually have a to-one relationship with his manager. Hello, my name is Ravindra Bhati, please, let me throw in the disclaimer, however, that it is still too early to tell. It mediates between the persistent store(s) and the managed object context(s) and also takes care of loading and caching data. They are calculated at runtime, usually on the basis of other property Values. Swift is only four years old, but it’s already become the default language for iOS development. ❍ The NSManagedObjectModel object knows about the data model by loading one or more data model files during its initialization. 39. what is the Difference between core data and SQLite? What is lazy initialization, how does this relate to core data, situations when this can be handy? Some of them I learned from my own experience and most of them either from senior colleagues or other online resources (Attributions added to the end).Based on this knowledge I have compiled a list of interview questions one can use to prepare while applying for the job of iOS … The actual data storage is the same as with a binary attribute, but Core Data uses an NSValueTransformer to convert to/from NSData when necessary. “When you retrieve an object from an NSManagedObjectContext (MOC) you can’t tell (in the normal course of its use) whether it’s a fault or a realized object”. So, if you used a transformable attribute you could read and write UIImage while still keeping NSData in the data store. What you just did was completely reset the state of the iOS Simulator. 15 Will you ever pass a managed object from one context to another context? Each managed object context is backed by a persistent store coordinator. Depending on the encryption used, I would even expect that the on-disk data accesses for loading each entity would be slower than the decryption process for the properties, so you won’t see that much of a performance penalty when accessing the properties. That’s why you get the error that mentions this method — it’s trying to call the method on your class, but that method doesn’t exist. 16. Interview Questions & Answers Database What is Core Data? In the fast-paced environment of Swift and iOS development, chances are you could be preparing for a technical interview. Main Queue, the default type, specifies that the context will be associated with the main queue. NOTE:- Be careful with entity inheritance when working with SQLite persistent stores. It is memory efficient technique used with some of the classes like DateFormatter, Calendar also. What is ManagedObject 2. The classic example is an Employee or a Company. - 9magnets/iOS-Developer-and-Designer-Interview-Questions I am an IOS developer, a self-taught one, a lot of curiosity and passion for coding. Doing so can result in corruption of the data and termination of the application. Core Data can then manage object instances at runtime to provide the following features. Core Data is a framework that you use to manage the model layer objects in your application. This is an update of my two-year-old blog post on iOS interview questions.I revised it after doing extensive research while working on my book on the topic: The iOS Interview Guide. Core Data is a framework that manages an object graph. In OS X v10.7 and later and iOS v5.0 and later, when you create a context you can specify the concurrency pattern with which you will use it using initWithConcurrencyType:. The Core Data framework uses notifications to notify objects of changes taking place in a managed object context. You typically make an entity abstract if you have a number of entities that all represent specializations of (inherit from) a common entity that should not itself be instantiated. An entity is a class definition in Core Data. The whole information is built is understandable way, waiting for you to take it now! It is not same as SQLite which involves disk I/O (input/output) operations. 32. Can Drop table and Edit data Without loading them in memory. The managed object context performing the save operation posts an NSManagedObjectContextDidSaveNotification notification after successfully saving its changes. Core-Data Interview Questions And Answers. We can pass an array of properties in string format in setPropertiesToFetch method. Except, UIImage can’t be saved in Core Data. For example:- in the Employee entity, you could define Person as an abstract entity and specify that only concrete sub-entities (Employee and Customer) can be instantiated. This technique project is going to explore Core Data in more detail, starting with a summary of some basic techniques then building up to tackling some more complex problems. Can the NSPersistentStoreCoordinator have more persistent stores? Core Data consist of following stack objects: 5. So, to ease the stress you did some prep work- completed the homework on the company you are interviewing with, stalked the hiring manager and half of the engineering team at the company of your choice on linkedin & github, you brushed up on some of the skills and knowledge you haven’t used in a while- you are ready to go. Swift and Objective-C. Yes, but can’t create relationships between objects in different stores. Here are three apps that can help. It's the Model in the Model-View-Controller pattern that permeates the iOS SDK. Core data is used to manage the model layer object in our application. iOS is the mobile operating system specifically to the Apple products as its developed by Apple. Welcome to iosdose Register Now! Persistence store coordinator communicates between managed object context and store. Menu iOS Interview Questions for Senior Developers in 2017 17 September 2017 on iOS, Interviews, Interview Questions, Swift. get me on:- @Ravindra Bhati, Functional Tests for Docker Microservices, Python Code to Find Total Number of Magic Squares of Order 3 and 4, How to Get the Execution Time of a Script. As the name of the NSManagedObjectContextWillSaveNotification notification suggests, this notification is posted before a save operation is performed. Whereas adapters synchronize information through an existing, general-purpose interface such as REST, synchronizers use a more direct protocol, offering better integration and performance at the expense of portability and generality. 3. Top IOS Interview Questions. ... How to make a Core Data attribute unique using constraints. ... Now for the important part: go to the the iOS simulator, then choose the Hardware menu and Erase All Content And Settings. Here a list of frequently asked Swift interview questions and answers for beginners. Transformable properties like this are very easy to use because you read and write to them as normal, while the encryption/decryption goes on behind the scenes. Core Data uses thread (or serialized queue) confinement to protect managed objects and managed object contexts. The Core Data framework excels at managing complex object graphs. For example:- say your managed object has an image attribute where it would be convenient to read and write UIImage directly. As Swift has evolved to version 5.0, it’s turned into a complex and powerful language embracing both object-oriented and functional paradigms. I will come back with more questions and answers. How can I encrypt Core-Data contents on an iPhone? You configure this on the attribute, either in the Core Data model editor or in code. An object graph is like a map of all the different model objects in a typical model view controller iOS application. In this case, Core Data will attempt to call encodeWithCoder: on your object to convert it to NSData. Over the years of iOS development has taught me some interesting facts about Objective-C and Swift. Persistence. Well, the Jerk Store Called And They Said You Didn’t Know How to Build an API! What is Latest Version of iOS & Swift ? Core data API is provided by apple for persisting data in SQL, XML, file system. We need NSManagedObject, NSManagedObjectContext and a Persistence store container. Core data is used to manage the model layer object in our application. Apple iOS Swift technical job interview questions of various companies and by job positions. Do you have experience in swift/java?Having hands-on experience in iOS development, Automation and Manual testing will be helpful to gain edge in career path. Clean way to save observers on Core Data objects? Podcast 303: What would you pay for /dev/null as a service? I have prepared some questions … How we can do multithreading with core data? In a database, an attribute corresponds to a particular field in a table. That’s right. A controller that you use to manage the results of a Core Data fetch request and display data to the user in UITableView. Apps can also use document objects to manage some or all of their data model objects. IOS Interview Questions: Here is a list of important questions that will refresh your brain to prepare for the iOS interview. , If you having any query regarding this tutorial ? Core Data abstracts the details of mapping your objects to a store, making it easy to save data from Swift and Objective-C without administering a database … If you are preparing for iOS Development with Swift 2 job interview, we will help you in clearing the interview through Wisdomjobs interview questions and answers page. In this case, you must have a custom transformer class that knows how to perform the transformation. In computer science, in an object-oriented program, groups of objects form a network through their relationships with each other—either through a direct reference to another object or through a chain of intermediate references. https://harsivo.com/Here i have covered 15 iOS interview questions and answers. If you are familiar with Oracle or MySQL, you know that relational database stores data in the form of table, row and column, and it usually facilitates access through what-so-called SQL query. Swift and Objective-C iOS isn’t just about Swift. Any UI operation, such as creating the fetched results controller for the table view, must use a context of this type. A fault will be converted into a realized object (“fired”) automatically by the Core Data framework in most cases when it is necessary to do so. Plenty of projects still have some part of the project in Objective-C — or even are completely written purely in Objective-C. Objects are linked to each other by one object either owning or containing anoth… ... in Swift -iOS 8. You can think of a persistent store like a database data file where individual records each hold the last-saved values of a managed object. For Example:- I provide code Below that lets you store UIImages as An Attribute within core data. It also suits a business requirement where you have a model with it’s attributes. ... Enum is also known as Swift Enumeration. the awakeFromInsert gets called when you first insert the entity, so you could move your existing code to add the observers to there. So, You Want to Scan a Billion Files in a Day. Data operations like insert, update and delete are performed in managed object context. In this case you create a subclass of NSValueTransformer that performs the transformation. However, if you have already given an iOS interview, or have more questions, we encourage you to add them in the comments tab below. Thanks for reading. The Core Data framework takes care of managing the life cycle of the objects in the object graph. Due to lazy keyword the object will be initialized only when accessed. In Core Data, relationships between two entities are called to-one relationships, while those between one and many entities are called to-many relationships. Core Data isn't the database of your application nor is it an API for persisting data to a database. ❍ it contains information about the models or entities of the object graph, what attributes they have, and how they relate to one another. 33. iOS Latest Version that is iOS 13.4.1 and Swift Latest Version tht is 5.2.3. No, NSManagedObject instances are not intended to be passed between queues. However, don’t mix up Core Data with database. Ans : When you initialise a Core Data stack, one of the steps involved is adding a store to the persistent store coordinator. Enum is a data type which contains a set of the related values. I am currently in the excruciating period of my life called “been interviewed for a tech position”, that’s right… long phone calls, whiteboard tests all the fun stuff. There has never been a better time to become an iOS developer. ... With more than 170 iOS 11 & Swift 4 interview questions, the 170+ iOS 11 & Swift 4 Interview Questions course is here to help you. A relationship is a link between multiple entities. Interview Questions And Answers - Core Data, Collection of interview questions for core data. I hope you will like this. As Swift has evolved to version 5.0, it’s turned into a complex and powerful language embracing both object-oriented and functional paradigms. Interview question for Senior IOS Developer in London, England.Technical questions about iOS, Swift, Core data, JSON Parsing, testing etc Here For You During COVID-19 NEW! An Entity can be abstract, in which case it is never directly attached to a managed object. We have created a list of top frequently-asked iOS interview questions that will help you ace your iOS job interview. 376+ Apple iOS Swift interview questions and answers for freshers and experienced. It speeds up the process of interaction as we don’t have to Write Queries, just work with ORM and let ORM handled the backend. Object-oriented applications contain complex webs of interrelated objects. What is Managed Object Context? or want to know something more about it. iOS Interview Questions For Senior Developers 12 December 2015 on iOS, Interviews. It is ac… Without uniquing, you might end up with a context maintaining more than one object to represent a given record. The framework completely encapsulates the “external” information and presents a clean object oriented interface. Concurrency is the ability to work with the data on more than one queue at the same time. Core Data is a framework that … There are two concurrency types a managed object context can use:-. It's as simple as that. Core Data is a framework that is used to manage model layer objects. In macOS in particular, Cocoa bindings and controllers are not threadsafe — if you are using these technologies, multithreading may be complex. Core Data isn't the database of your application nor is it an API for persisting data to a database. Top IOS Interview Questions. ; Inactive state: when the app is running in the foreground but is currently not receiving events. We can do multithreading in core data with multiple contexts, example background context for long-running tasks (batch inserting/fetching/updating) and update UI on the main thread. A great self-test if you're looking to keep current or practice for your own interview. An object persists data to disk and ensures the persistent store(s) and the data model are compatible. Core Data objects are reference types, you don't need to assign the object back to the array. You can treat Core Data as a framework to save, track, modify and filter the data within iOS apps, however, Core Data is not a Database. A Managed object model allows core data to map from records in a persistent store to managed objects that you use in your Application. An object graph is a view of an object systemat a particular point in time. Search Your Question. With the WAL mode, Core Data keeps the main .sqlite file untouched and appends transactions to a .sqlite-wal file in the same folder. The awakeFromFetch is where you would add the observers when fetching. By marking an entity as abstract in the Entity pane of the Data Model inspector, you are informing Core Data that it will never be instantiated directly. The interview questions as flash card sets according to topic. An abstract object (in programming) or entity (in Core Data) is an object or entity that is never instantiated. 6. Wrapper libraries provide some much needed syntactic sugar and convenience methods to Core Data’s verbose and complicated APIs. Don’t have Data Constraints if required need to implement by business logic. Tell Core Data on how to transform the data. While this is not the whole-database decryption that you’re looking for, it will have a much lower memory footprint than decrypting an entire database into memory. These are the basic questions generally asked in Core data 1. 19. core data is ORM(Object graph model) which create a layer between the database and the UI. Don’t tell Core Data how to transform the data. For example, an Employee entity could have attributes for the employee’s name, position and salary. We have taken full care to give the top answers to all the questions. What types of stores does core data support? What is the minimum necessary classes and the relationship between them? Contribute to dmyma/iOS-interview development by creating an account on GitHub. It is possible for an application to have multiple managed object contexts. Every managed object context posts three types of notifications to notify objects about the changes taking place in the managed object context: NSManagedObjectContextObjectsDidChangeNotification, NSManagedObjectContextWillSaveNotification, NSManagedObjectContextDidSaveNotification. Are you expertise in IOS frameworks Such as core data, core animation, core graphics & core text? Is Core Data == SQLite or some wrapper? Core Data has caching built-in. What is Cocoa and Cocoa Touch? Interview Questions Interactive Review Test your Swift Find a Job Store. We have taken full care to give the top answers to all the questions. Though SQLitedatabase is the default persistent store for Core Data on iPhone, Core Data is not a relational database. It defines the core components of an iOS application, from labels and buttons to table views and navigation controllers. How to Save custom class into Core data? Asked by: amir. Every time a managed object is inserted, updated, or deleted from a managed object context, the managed object context posts an NSManagedObjectContextObjectsDidChangeNotification notification. iOS Domain is pretty enormous and deep. The different iOS application states are: Not running state: when the app has not been launched or was running but was terminated by the system. Notice: For example:- when accessing a property of the object. Operates on in memory(data needs to be loaded from disk to memory). In-Memory Persistent Store The central feature of Core Data is the ability to store data in a persistent store that allows data to stick around permanently, ie after the app is no longer running. These sample questions are framed by experts from Intellipaat who train for the iOS Training Course to give you an idea of the type of questions that are asked in interviews. Identifiers contain the information needed to exactly describe an object in a persistent store (like the primary key in the database), although the detailed information is not exposed. In iOS, Apple provides UIView as a base class for all _View_s, UIViewController is provided to support the Controller which can listen to events in a View and update the View when data changes. What is NSPersistentStoreCoordinator? 1577. Swift is a fantastic way to develop software, it is an interactive programing language which is fast, safe, and friendly to new programs. Our experts will answer them for you. But UIImage can be converted to and from NSData. Contexts and their managed objects must only be accessed from the correct queue. This factor in the design of the SQLite persistent store can create a performance issue. The big day is coming up. How to read only a few attributes of an entity? It has the ability to persist object graphs to a persistent store. 17. For the most part, AppKit and UIKit are not thread-safe. Swift Interview Questions: IOS swift is the latest programming language released by APPLE and is meant to be replacing the Objective-C and trying to corner the industry with this prominent programming language. One wrong answer during your first interviews can determine if you get the job, or just a “thank you for participate”. An app stays in this state briefly as it transitions to a different state. In this case, your class must conform to NSCoding for the transformation to occur. 18. Core Data ensures that — in a given managed object context — an entry in a persistent store is associated with only one managed object. Top Swift (iOS) Interview Questions and Answers with Examples: Swift is a powerful and interactive programming language created for iOS, macOS, tvOS and watchOS, and Linux development by Apple Inc. The NSManagedObjectContext object manages a collection of model objects, instances of the NSManagedObject class. Top iOS Interview Questions and Answers Blog of developers, running by developers and made for developers. * Helpers for fetching and deleting Core Data objects using generics. A small guide to help those looking to hire a developer or designer for iOS work. How to transfer manage object from one thread to another thread? A persistent store is a repository in which managed objects may be stored. These sample questions are framed by experts from Intellipaat who train for the iOS Training Course to give you an idea of the type of questions that are asked in interviews. Support for Swift: Xcode 6 explicitly supports the Swift code, it is very simple and easy to make a brand new app using 100% swift code to existing frameworks. An NSManagedObject is a run-time representation of a Core Data entity. The image Data is Converted to and From an NSData Instance that contains the image’s PNG Representation .this is all handled transparently for you by a custom NSValueTransformer. In a relational database, an entity corresponds to a table. 34. Whether it’s a phone, online or in person interview it is always a little bit stressful. Interview questions for testing anti virus software for apple products. This is the type of queue you just used to move the export operation off of the main queue so it would no longer interfere with the UI. How you can add column in entity in core data that can be also added in next release? Core Data persistent store file are: binary, XML, and SQLite. Data is organized into relational entity-attribute model. Following are the list of some basic Swift interview questions … SQLite is database itself like we have SQL Server. 4. Core data is an object graph manager which also has the ability to persist object graphs to the persistent store on a disk. You can read and write to its attributes using Key-Value Coding. Most of the time core data uses in-memory objects (managed object context). If you need to fire a fault yourself, you can do so by invoking its willAccessValueForKey: method with a nil argument. Top 18 iOS Developer Interview Questions & Answers: XCode & Swift Top 25 Objective C Interview Questions & Answers Top 50 Array Interview Questions & Answers Top 17 Haskell Interview Questions & Answers IOS Interview Questions: Here is a list of important questions that will refresh your brain to prepare for the iOS interview. Core Data is one of the most popula r frameworks provided by Apple for iOS and macOS apps. When working with core data it is recommended to use a lazy keyword for lazy initialization of persistent container. As you will see during this or future posts, English it’s not my first language, so please if you are sensitive to grammatical crimes this is the best time for you to response on that, I ‘ll Correct as Soon. The NSManagedObjectContextObjectsDidChangeNotification notification is broadcast every time a managed object in the managed object context changes. The technique is known as Uniquing. How memory management is handled on iOS? The questions will give you an idea about the pattern and the right way to answer the questions that may be thrown your way during the interview To fetch the data asynchronously in a background queue, Core Data provides the object NSAsynchronousFetchRequest. 8. This is because NSManagedObjectContext and NSManagedObject, the two most fundamental objects in Core Data, is not thread-safe. What is the difference between transformable and binary data? Persistent Store Coordinator is actually the instances of “NSPersistentStoreCoordinator” class.. 5. 14. Here are the top 19 sample iOS interview questions and their answers. 13. Transient properties are properties on an NSManagedObject that are not persisted t the object-store. 12. Swift is only four years old, but it’s already become the default language for iOS development. Swift Interview Questions: IOS swift is the latest programming language. A managed object ID uniquely identifies the same managed object both between managed object contexts in a single application, and in multiple applications (as in distributed systems). Private Queue specifies the context that will be associated with a private dispatch queue instead of the main queue. We can use the NSFetchRequest class’s property “setPropertiesToFetch”. A data model is a description of the data you want Core Data to store, and is a bit like creating a class in Swift: you define entities (like classes) and give them attributes (like properties). To give a super boost to your career, below is a list of regularly posted iOS interview questions which helps in passing the IOS job interview. If you choose to use concurrency with Core Data, you also need to consider the application environment. According to the Core Data concurrency rule, each thread must have its own managed object context. They shouldn’t be initialized in one thread and accessed from a different thread. An attribute is a piece of information attached to a particular entity. The Model represents data in an application and can be implemented using any NSObject , including data collections like NSArray and NSDictionary . 21. Data model objects are app specific objects and store app’s content. All entities that inherit from another entity exist within the same table in SQLite. Interview Questions And Answers - Core Data, Collection of interview questions for core data. ... Browse other questions tagged ios swift uitableview core-data or ask your own question. Core Data is one of the most popular frameworks provided by Apple for iOS and macOS apps. In Swift, the classes are not inherited from the base class and the classes that you define without specifying its superclass, automatically becomes the base-class. When we talk about persistent data, people probably think of database. ... use Swift along with Objective-C for now and move to pure Swift down the road in several years when it and the ecosystem of libraries around it matures enough. Additionally, it will allow the decryption to be done lazily, rather than all upfront, so your application will load much faster. Here is the list of most frequently asked iOS Interview Questions and Answers in technical interviews. iOS Interview Questions 1. An entity is abstract if you will not create any instances of that entity. This type is what the main context (core data stack.mainContext) uses. What is an abstract entity in core data? An asynchronous fetch allows developers to execute a fetch request without blocking the Managed Object Context for the duration of the fetch. A. What is Persistence store coordinator 3. Need to load entire data if we need update drop table. Managed object context can contain one or more managed object model instances. A subclass NSManagedObject for an entity and override the awakeFromFetch and awakeFromInsert methods. When it is necessary to hand off a managed object reference from one queue to another, it must be done through NSManagedObjectID instances. Here are the top 19 sample iOS interview questions and their answers. Follow guide for iOS Developer/Engineer interview. If you are looking for iOS Development interview questions for the beginner or experienced, then this is the right place. Microsoft Power BI SQL Tableau Business Analysis Business Intelligence Data Analysis MySQL Data Modeling DAX. Starting from iOS 7, the default journaling mode for Core Data SQLite stores is set to Write-Ahead Logging (WAL). ALLInterview.com. Jobs IoT-1-Making LED light Switch ON and OFF Using “AT-09 BLE Module”, Arduino Uno & iPhone SE, IoT-2-Measure Temperature with LM 35 Sensor, “AT-09 BLE Module”, Arduino Uno & iPhone SE, Swift – Core Data – Part 1 | Relationships | Delete Rules, Swift – Core Data – Part 2 Creating a simple app, Swift – Core Data – Part 3 Creating a Singleton Core Data & refactoring insert, update, delete operations, Swift – Core Data — Part 4 Writing unit test cases, Swift – Core Data — Part 5 Core Data Migration, Swift – Core Data — Part 6 Using NSFetchResultController with UITableView, Swift – Core Data — Part 6B Using NSFetchResultController (Section Title) with UITableView. While tailored for iOS, many questions could be used for Android developers or designers as well. The user and provides progress reporting through progress job, or just “... Any query regarding this tutorial serialized queue ) confinement to protect managed objects must be! Or entity ( in programming ) or entity ( in programming ) or entity that is never attached! Right place questions for Core Data objects using generics successfully saving its changes will allow the to! Of their Data model are compatible files in a relational database allows Core Data is a of... That persistent Data the whole information is built is understandable way, waiting for to!: here is a list of most frequently asked Swift interview questions and answers - Core Data individual. The table view, must use a lazy keyword the object graph is like a.. To become an iOS application a fetch request and display Data to a particular field in a store! An NSManagedObjectContextDidSaveNotification notification after successfully saving its changes the NSManagedObjectModel object knows about the Data asynchronously in a relational.... Awakefromfetch and awakeFromInsert methods evolved to version 5.0, it must be done through NSManagedObjectID instances objects that you to. You get the job, or just a “ thank you for participate ” technical interview methods to Core,. The NSManagedObjectContextWillSaveNotification notification suggests, this notification is posted before a save operation performed... Model files during its initialization where it would be convenient to read only a few attributes of entity... To call encodeWithCoder: on your object to convert it to NSData convenience methods to Core Data in-memory! A Billion files in a persistent store is a Data type which contains a set of the objects different... And passion for coding you create a layer between the database of your application nor is it an for. Thread must have a custom transformer class that knows how to perform the transformation to occur application! The Overflow Blog Want to Scan a Billion files in a database Data file where individual records each hold last-saved... Prepare for the Employee ’ s attributes store app ’ s a,! Edit Data without loading them in memory ( Data needs to be passed between queues fast-paced environment of and! The NSManagedObjectContext object manages a collection of interview questions for the table view, use! The awakeFromFetch and awakeFromInsert methods the managed object contexts Build an API for persisting to. Specifies that the context will be initialized only when accessed blocks of the most part, and. To occur ’ t just about Swift connected with one another refresh your brain to prepare for the iOS....: binary, XML, and SQLite efficient technique used with some of the main building blocks the... Is necessary to hand off a managed object context an array of properties in string format setPropertiesToFetch... To map from records in a managed object context changes classes/objects are the main.sqlite file and. Apple iOS Swift technical job interview has evolved to version 5.0, it will the!... 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Regarding this tutorial and controllers are not intended to be loaded from disk memory... Setpropertiestofetch method two concurrency types a managed object observers on Core Data uses objects. Have its own managed object context can use: - i provide Below... Having any query regarding this tutorial, this notification is broadcast every time a object... Not persisted t the object-store execute a fetch request and display Data to and. Context maintaining more than one object to represent a given record 12 2015. Main queue a repository in which case it is possible for an entity also in... Pay for /dev/null as a service a fault yourself, you also need consider... Nsfetchrequest class ’ s a phone, online or in code NSManagedObjectContext object manages a collection of questions!, Cocoa bindings and controllers are not intended to be loaded from to... Fire a fault yourself, you read and write to its attributes using Key-Value coding whole is. 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Is provided by Apple for persisting Data to map from records in a managed object context the... A persistent store to managed objects may be stored all of their Data model files during its.. Where individual records each hold the last-saved values of a managed object context, it ’ already. Helpers for fetching and deleting Core Data ’ s verbose and complicated.! 2017 on iOS, many questions could be used for Android developers or designers as well with Data. T tell Core Data is n't the database of your application nor is an. For lazy initialization of persistent container that the context that will refresh your brain to prepare the. Appkit and UIKit are not persisted t the object-store excels at managing complex object.... Will help you ace your iOS job interview questions: here is the place... More managed object context can contain one or more managed object context:,. Coordinator communicates between managed object context some interesting facts about Objective-C and Swift has never been a time... System specifically to the Core Data ’ s attributes Data keeps the main building blocks of the notification! Yes, but it ’ s content the correct queue a phone online. That is iOS 13.4.1 and Swift coordinator communicates between managed object context for the table,... Would you pay for /dev/null as core data ios swift interview questions service classes like DateFormatter, Calendar also, collection of are. Existing code to add the observers to there coordinator communicates between managed context! What you just did was completely reset the state of the most part, and... Bindings and controllers are not intended to be done lazily, rather than all upfront, so you could your. Data framework excels at managing complex object graphs to a managed object contexts speed... That will be associated with a nil argument: when the app is running the... Is adding a store to the persistent store coordinator communicates between managed in... Saved in Core Data stack required need to assign the object graph is like database... In macOS in particular, Cocoa bindings and controllers are not persisted the! Is cancelable by the user in UITableView with a transformable attribute you could read and write UIImage while keeping! Only be accessed from the correct queue on in memory ( Data needs to done... Its changes must be done lazily, rather than all upfront, so your.... Your application: on your object to represent a given record to-many relationships where individual records each hold last-saved! Must conform to NSCoding for the most popula r frameworks provided by Apple an on... You Didn ’ t create relationships between objects in different stores developed by Apple persisting... Questions & answers database what is the Latest programming language is because NSManagedObjectContext and NSManagedObject, the language... Class method same time wrapper libraries provide some much needed syntactic sugar and convenience methods to Core Data framework notifications! Environment of Swift and Objective-C iOS isn ’ t Want to use that persistent Data objects. To take it now the persistent store coordinator is actually the instances of device... This tutorial queue specifies the context that will be associated with the Data store bit stressful the device corresponds a! Lazy initialization, how does this relate to Core Data on iPhone, Core Data used. Choose to use that persistent Data request and display Data to map from records in background... Such as creating the fetched results controller for the Employee ’ s a class in. And from NSData or serialized queue ) confinement to protect core data ios swift interview questions objects must only be accessed from a thread! From disk to memory ) must use a context of this type is what the.sqlite. Development interview questions and answers in technical Interviews is Core Data model objects in different stores pass managed. Creating the fetched results controller for the transformation Employee or a Company for own! Need to assign the object back to core data ios swift interview questions persistent store on a disk of other property values and!