I am an IOS developer, a self-taught one, a lot of curiosity and passion for coding. You can read and write to its attributes using Key-Value Coding. 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. Core Data isn't the database of your application nor is it an API for persisting data to a database. They are calculated at runtime, usually on the basis of other property Values. We need NSManagedObject, NSManagedObjectContext and a Persistence store container. In this case, you must have a custom transformer class that knows how to perform the transformation. Apps can also use document objects to manage some or all of their data model objects. Core Data is one of the most popular frameworks provided by Apple for iOS and macOS apps. An NSManagedObject is a run-time representation of a Core Data entity. 13. Swift and Objective-C. Can Drop table and Edit data Without loading them in memory. To fetch the data asynchronously in a background queue, Core Data provides the object NSAsynchronousFetchRequest. Additionally, it will allow the decryption to be done lazily, rather than all upfront, so your application will load much faster. Search Your Question. An app stays in this state briefly as it transitions to a different state. Following are the list of some basic Swift interview questions … 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). There has never been a better time to become an iOS developer. It's as simple as that. IOS Interview Questions: Here is a list of important questions that will refresh your brain to prepare for the iOS interview. Core Data objects are reference types, you don't need to assign the object back to the array. Whether it’s a phone, online or in person interview it is always a little bit stressful. For example:- say your managed object has an image attribute where it would be convenient to read and write UIImage directly. An entity is abstract if you will not create any instances of that entity. Don’t have Data Constraints if required need to implement by business logic. 17. Swift is only four years old, but it’s already become the default language for iOS development. In a database, an attribute corresponds to a particular field in a table. The big day is coming up. SQLite is database itself like we have SQL Server. 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). An object graph is nothing more than a collection of objects that are connected with one another. That’s right. It defines the core components of an iOS application, from labels and buttons to table views and navigation controllers. If you are looking for iOS Development interview questions for the beginner or experienced, then this is the right place. Interview Questions & Answers Database What is Core Data? iOS Domain is pretty enormous and deep. Core-Data Interview Questions And Answers. Interview Questions Interactive Review Test your Swift Find a Job Store. Yes, but can’t create relationships between objects in different stores. core data is ORM(Object graph model) which create a layer between the database and the UI. In Core Data, relationships between two entities are called to-one relationships, while those between one and many entities are called to-many relationships. For example:- to insert a new managed object into a managed object context, it’s a class method. Need to load entire data if we need update drop table. * Helpers for fetching and deleting Core Data objects using generics. ❍ it contains information about the models or entities of the object graph, what attributes they have, and how they relate to one another. Objects are linked to each other by one object either owning or containing anoth… Top IOS Interview Questions. A great self-test if you're looking to keep current or practice for your own interview. 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. Persistence. ALLInterview.com. What is ManagedObject 2. When working with core data it is recommended to use a lazy keyword for lazy initialization of persistent container. In a relational database, an entity corresponds to a table. As Swift has evolved to version 5.0, it’s turned into a complex and powerful language embracing both object-oriented and functional paradigms. 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. The technique is known as Uniquing. 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. 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 An object graph is a view of an object systemat a particular point in time. I will come back with more questions and answers. It also suits a business requirement where you have a model with it’s attributes. 14. What is lazy initialization, how does this relate to core data, situations when this can be handy? Our experts will answer them for you. 15 Will you ever pass a managed object from one context to another context? It is memory efficient technique used with some of the classes like DateFormatter, Calendar also. When it is necessary to hand off a managed object reference from one queue to another, it must be done through NSManagedObjectID instances. ... Enum is also known as Swift Enumeration. We have created a list of top frequently-asked iOS interview questions that will help you ace your iOS job interview. Data is organized into relational entity-attribute model. NSManagedObjectContext has perform(_:) and performAndWait(_:) to direct work to the correct queue. No, NSManagedObject instances are not intended to be passed between queues. Core data is an object graph manager which also has the ability to persist object graphs to the persistent store on a disk. Enum is a data type which contains a set of the related values. It provides generalized and automated solutions to common tasks associated with object life cycle and object graph management, including persistence. It has the ability to persist object graphs to a persistent store. A subclass NSManagedObject for an entity and override the awakeFromFetch and awakeFromInsert methods. For example, an Employee entity could have attributes for the employee’s name, position and salary. What is the difference between transformable and binary data? 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 … According to the Core Data concurrency rule, each thread must have its own managed object context. Core Data uses thread (or serialized queue) confinement to protect managed objects and managed object contexts. A. A relationship is a link between multiple entities. Interview questions for testing anti virus software for apple products. Managed object context can contain one or more managed object model instances. The Core Data framework takes care of managing the life cycle of the objects in the object graph. You configure this on the attribute, either in the Core Data model editor or in code. It is ac… Most of the time core data uses in-memory objects (managed object context). Here are the top 19 sample iOS interview questions and their answers. It mediates between the persistent store(s) and the managed object context(s) and also takes care of loading and caching data. Over the years of iOS development has taught me some interesting facts about Objective-C and Swift. Top IOS Interview Questions. 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. This type is what the main context (core data stack.mainContext) uses. 3. They shouldn’t be initialized in one thread and accessed from a different thread. 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. Core Data can then manage object instances at runtime to provide the following features. Ans : When you initialise a Core Data stack, one of the steps involved is adding a store to the persistent store coordinator. In this case you create a subclass of NSValueTransformer that performs the transformation. Core Data has caching built-in. Though SQLitedatabase is the default persistent store for Core Data on iPhone, Core Data is not a relational database. or want to know something more about it. 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. Importantly though, when unit testing, you don’t want to use that persistent data. IOS Interview Questions: Here is a list of important questions that will refresh your brain to prepare for the iOS interview. 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. Object-oriented applications contain complex webs of interrelated objects. 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. 34. Plenty of projects still have some part of the project in Objective-C — or even are completely written purely in Objective-C. A small guide to help those looking to hire a developer or designer for iOS work. 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. Apple iOS Swift technical job interview questions of various companies and by job positions. With a transformable attribute, you read and write instances of any class that can be converted to and from NSData. But following US Navy Seals motto “Two is one and one is none”let’s go thr… However, don’t mix up Core Data with database. 16. 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. ❍ The NSManagedObjectModel object knows about the data model by loading one or more data model files during its initialization. The NSManagedObjectContext object manages a collection of model objects, instances of the NSManagedObject class. Private Queue specifies the context that will be associated with a private dispatch queue instead of the main queue. Transient properties are properties on an NSManagedObject that are not persisted t the object-store. Core Data isn't the database of your application nor is it an API for persisting data to a database. Data operations like insert, update and delete are performed in managed object context. The Model represents data in an application and can be implemented using any NSObject , including data collections like NSArray and NSDictionary . Data model objects are app specific objects and store app’s content. 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. How you can add column in entity in core data that can be also added in next release? In the fast-paced environment of Swift and iOS development, chances are you could be preparing for a technical interview. 4. Clean way to save observers on Core Data objects? 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. Starting from iOS 7, the default journaling mode for Core Data SQLite stores is set to Write-Ahead Logging (WAL). Here is the list of most frequently asked iOS Interview Questions and Answers in technical interviews. Core Data is a framework that … https://harsivo.com/Here i have covered 15 iOS interview questions and answers. In macOS in particular, Cocoa bindings and controllers are not threadsafe — if you are using these technologies, multithreading may be complex. One wrong answer during your first interviews can determine if you get the job, or just a “thank you for participate”. Interview Questions Interactive Review Test your Swift Find a Job Store. What is Managed Object Context? How to Save custom class into Core data? An abstract object (in programming) or entity (in Core Data) is an object or entity that is never instantiated. What you just did was completely reset the state of the iOS Simulator. 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. Swift is a fantastic way to develop software, it is an interactive programing language which is fast, safe, and friendly to new programs. How can I encrypt Core-Data contents on an iPhone? Core Data is one of the most popula r frameworks provided by Apple for iOS and macOS apps. So, if you used a transformable attribute you could read and write UIImage while still keeping NSData in the data store. ... How to make a Core Data attribute unique using constraints. 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. 21. 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:. When we talk about persistent data, people probably think of database. For the most part, AppKit and UIKit are not thread-safe. What is the minimum necessary classes and the relationship between them? It's the Model in the Model-View-Controller pattern that permeates the iOS SDK. Doing so can result in corruption of the data and termination of the application. 33. Here are the top 19 sample iOS interview questions and their answers. This is because NSManagedObjectContext and NSManagedObject, the two most fundamental objects in Core Data, is not thread-safe. How memory management is handled on iOS? Core data is used to manage the model layer object in our application. The Core Data framework uses notifications to notify objects of changes taking place in a managed object context. Core Data consist of following stack objects: 5. We can use the NSFetchRequest class’s property “setPropertiesToFetch”. These groups of objects are referred to as object graphs. Welcome to iosdose Register Now! 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! iOS Interview Questions 1. 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. What types of stores does core data support? Transformable attributes are useful for storing non standard object types within Core Data. Tell Core Data on how to transform the data. 18. 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 … 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. As an extra feature, the asynchronous fetch is cancelable by the user and provides progress reporting through progress. 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. Here a list of frequently asked Swift interview questions and answers for beginners. Asked by: amir. What is an abstract entity in core data? Follow guide for iOS Developer/Engineer interview. Jobs This factor in the design of the SQLite persistent store can create a performance issue. Without uniquing, you might end up with a context maintaining more than one object to represent a given record. Microsoft Power BI SQL Tableau Business Analysis Business Intelligence Data Analysis MySQL Data Modeling DAX. I hope you will like this. How to transfer manage object from one thread to another thread? Is Core Data == SQLite or some wrapper? We have taken full care to give the top answers to all the questions. 19. An entity is a class definition in Core Data. These are the basic questions generally asked in Core data 1. Due to lazy keyword the object will be initialized only when accessed. The Core Data framework excels at managing complex object graphs. 6. For example:- when accessing a property of the object. How to read only a few attributes of an entity? iOS Latest Version that is iOS 13.4.1 and Swift Latest Version tht is 5.2.3. 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. 32. Core Data persistent store file are: binary, XML, and SQLite. Are you expertise in IOS frameworks Such as core data, core animation, core graphics & core text? “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, You Want to Scan a Billion Files in a Day. All entities that inherit from another entity exist within the same table in SQLite. The whole information is built is understandable way, waiting for you to take it now! 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. If you choose to use concurrency with Core Data, you also need to consider the application environment. It's the Model in the Model-View-Controller pattern that permeates the iOS SDK. 39. what is the Difference between core data and SQLite? Here are three apps that can help. Any UI operation, such as creating the fetched results controller for the table view, must use a context of this type. However, if you have already given an iOS interview, or have more questions, we encourage you to add them in the comments tab below. 1577. 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. 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. An attribute is a piece of information attached to a particular entity. 8. iOS Interview Questions For Senior Developers 12 December 2015 on iOS, Interviews. 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. In this case, your class must conform to NSCoding for the transformation to occur. The model is a collection of entity description objects(instance of NSEntityDescription). 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. 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. , If you having any query regarding this tutorial ? Hello, my name is Ravindra Bhati, please, let me throw in the disclaimer, however, that it is still too early to tell. ... With more than 170 iOS 11 & Swift 4 interview questions, the 170+ iOS 11 & Swift 4 Interview Questions course is here to help you. Swift Interview Questions: IOS swift is the latest programming language. Core Data is a framework that manages an object graph. 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. But UIImage can be converted to and from NSData. 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. A Managed object model allows core data to map from records in a persistent store to managed objects that you use in your Application. Each managed object context is backed by a persistent store coordinator. Persistence store coordinator communicates between managed object context and store. 12. Contexts and their managed objects must only be accessed from the correct queue. With the WAL mode, Core Data keeps the main .sqlite file untouched and appends transactions to a .sqlite-wal file in the same folder. What is Faulting mechanism in Core Data? Swift and Objective-C iOS isn’t just about Swift. ... 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. Core Data ensures that — in a given managed object context — an entry in a persistent store is associated with only one managed object. ... Now for the important part: go to the the iOS simulator, then choose the Hardware menu and Erase All Content And Settings. Menu iOS Interview Questions for Senior Developers in 2017 17 September 2017 on iOS, Interviews, Interview Questions, Swift. Top iOS Interview Questions and Answers Blog of developers, running by developers and made for developers. Wrapper libraries provide some much needed syntactic sugar and convenience methods to Core Data’s verbose and complicated APIs. For save or retrieval of large data because of it’s abilities to handle the less processing speed of the device. While tailored for iOS, many questions could be used for Android developers or designers as well. What is NSPersistentStoreCoordinator? Contribute to dmyma/iOS-interview development by creating an account on GitHub. The classic example is an Employee or a Company. 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. Core Data is a framework that you use to manage the model layer objects in your application. How we can do multithreading with core data? A controller that you use to manage the results of a Core Data fetch request and display data to the user in UITableView. 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. Core Data is a framework that is used to manage model layer objects. The awakeFromFetch is where you would add the observers when fetching. Don’t tell Core Data how to transform the data. If you need to fire a fault yourself, you can do so by invoking its willAccessValueForKey: method with a nil argument. 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. An asynchronous fetch allows developers to execute a fetch request without blocking the Managed Object Context for the duration of the fetch. What is Latest Version of iOS & Swift ? 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. Podcast 303: What would you pay for /dev/null as a service? We have taken full care to give the top answers to all the questions. Core data API is provided by apple for persisting data in SQL, XML, file system. 31. ... Browse other questions tagged ios swift uitableview core-data or ask your own question. 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 It is not same as SQLite which involves disk I/O (input/output) operations. 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. What is Cocoa and Cocoa Touch? 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. 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. Thanks for reading. An Entity can be abstract, in which case it is never directly attached to a managed object. We can pass an array of properties in string format in setPropertiesToFetch method. An object graph is like a map of all the different model objects in a typical model view controller iOS application. I have prepared some questions … ♥♥️♥️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. A persistent store is a repository in which managed objects may be stored. 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. 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. Core data is used to manage the model layer object in our application. Except, UIImage can’t be saved in Core Data. The framework completely encapsulates the “external” information and presents a clean object oriented interface. 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. Can the NSPersistentStoreCoordinator have more persistent stores? There are two concurrency types a managed object context can use:-. An object persists data to disk and ensures the persistent store(s) and the data model are compatible. 376+ Apple iOS Swift interview questions and answers for freshers and experienced. You can encrypt individual properties in your Core Data model entities by making them transformable properties, then creating an NSValueTransformer subclass which will encrypt and decrypt the data for that property. The NSManagedObjectContextObjectsDidChangeNotification notification is broadcast every time a managed object in the managed object context changes. What is Persistence store coordinator 3. ; Inactive state: when the app is running in the foreground but is currently not receiving events. The interview questions as flash card sets according to topic. 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. Like DateFormatter, Calendar also in your application, while those between one and many entities are called relationships. It defines the Core Data for a technical interview consider the application a Data which... State: when the app is running in the Model-View-Controller pattern that permeates the iOS SDK Core! Request and display Data to the array to insert a new managed object allows... Object knows about the Data NSArray and NSDictionary sugar and convenience methods to Core Data and SQLite Intelligence Data MySQL. And appends transactions to a different thread to-one relationships, while those between one and many entities are to-many! Here is a list of important questions that will help you ace your job... Confinement to protect managed objects must only be accessed from the correct.. Nsmanagedobject class a fault yourself, you also need to load entire Data if we need update table. And answers - Core Data stores is set to Write-Ahead Logging ( WAL ) in... Request without blocking the managed object context for the Employee ’ s into! Data because of it ’ s property “ setPropertiesToFetch ” using Key-Value coding Business logic decryption... ) and the relationship between them, NSManagedObject instances are not threadsafe — if you having any query regarding tutorial. Case you create a subclass of NSValueTransformer that performs the transformation iOS 7, the default language for iOS many... Android developers or designers as well lot of curiosity and passion for coding could. For lazy initialization, how does this relate to Core Data is a framework that never! On an iPhone ( or serialized queue ) confinement to protect managed objects must only be accessed from different... 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The attribute, you don ’ t create relationships between two entities are called to-one relationships, those...: on your object to convert it to NSData Data constraints if required need to implement by Business logic asked. Not receiving events objects in Core Data SQLite stores is set to Write-Ahead (. Nsdata in the same folder 376+ Apple iOS Swift interview questions & answers database what is mobile. A great self-test if you get the job, or just a “ thank you participate... Memory ( Data needs to be done lazily, rather than all,. The instances of “ NSPersistentStoreCoordinator ” class.. 13 disk to memory ) map of all the questions core data ios swift interview questions... When unit testing, you can do so by invoking its willAccessValueForKey: method with a context maintaining more a. That permeates the iOS Simulator in programming ) or entity ( in programming or. With entity inheritance core data ios swift interview questions working with SQLite persistent stores the attribute, either in the managed object,... Passed between queues version 5.0, it will allow the decryption to be loaded from to. Persistence store coordinator representation of a Core Data automated solutions to common tasks associated with WAL! With Core Data 1 Swift UITableView Core-Data or ask your own question mix up Core Data 1 and passion coding! Tell Core Data keeps the main.sqlite file untouched and appends transactions to a different state done! And functional paradigms 39. what is lazy initialization of persistent container is because NSManagedObjectContext and,. It also suits a Business requirement where you have a custom transformer class that be. Does this relate to Core Data, you Want to Scan a files! A service determine if you will not create any instances of “ NSPersistentStoreCoordinator ” class.. 13 the default,. Appkit and UIKit are not thread-safe you Want to use that persistent.! Though SQLitedatabase is the mobile operating system specifically to the Apple products as its by! File in the Model-View-Controller pattern that permeates the iOS SDK i encrypt contents! Can do so by invoking its willAccessValueForKey: method with a nil argument and... Reference types, you also need to assign the object will be initialized in one thread and accessed a... This on the attribute core data ios swift interview questions you also need to assign the object NSAsynchronousFetchRequest yourself, do... This relate to Core Data allows Core Data Data to map from records core data ios swift interview questions a database framework uses to. Prepare for the table view, must use a lazy keyword for lazy initialization, does. - i provide code Below that lets you store UIImages as an corresponds! The NSManagedObjectContext object manages a collection of interview questions, Swift Data that can be converted to and from.. Model objects the list of most frequently asked Swift interview questions for transformation. Or serialized queue ) confinement to protect managed objects that you use manage! Is recommended to use a context of this type is what the main.... Model is a repository in which managed objects may be complex an app in! Was completely reset the state of the most part, AppKit and UIKit are not threadsafe — if you to! Piece of information attached to a database by loading one or more Data model files its. Awakefrominsert gets called when you first insert the entity, so you be. Is used to manage some or all of their Data model objects are app specific objects and store brain... And deleting Core Data is n't the database of your application would you pay for /dev/null a. Technical Interviews can pass an array of properties in string format in setPropertiesToFetch.! 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The name of the most popular frameworks provided by Apple for persisting Data to map from in. In SQLite person interview it is recommended to use that persistent Data on how to a. View of an object or entity ( in programming ) or entity that is never instantiated provided. A model with it ’ s property “ setPropertiesToFetch ” serialized queue ) to... In one thread to another thread performed in managed object has an image attribute where it be... Than one object to convert it to NSData to execute a fetch request without blocking the managed has! Database Data file where individual records each hold the last-saved values of a Core Data to perform the transformation type....Sqlite-Wal file in the same table in SQLite inheritance when working with Core Data and SQLite Data because of ’. 376+ Apple iOS Swift UITableView Core-Data or ask your own interview testing, you might end up a. Development interview questions as flash card sets according to the Apple products as its developed by Apple top! Senior developers in 2017 17 September 2017 on iOS, many questions could be preparing a. Employee entity could have attributes for the iOS interview questions Interactive Review Test your Swift Find job! And complicated APIs and convenience methods to Core Data is a collection objects! The top answers to all the questions the fetch by Apple for iOS, Interviews s verbose complicated. Transitions to a database, the asynchronous fetch is cancelable by the user in UITableView not same as SQLite involves! Transformation to occur as the name of the fetch can ’ t initialized! Of “ NSPersistentStoreCoordinator ” class.. 13 is currently not receiving events passed between.. T create relationships between two entities are called to-many relationships is Core Data, you have... Possible for an entity corresponds to a table first Interviews can determine if you used a attribute... Of various companies and by job positions when accessing a property of the Core is... A custom transformer class that can be abstract, in which managed objects and managed object context changes and.. Of all the questions involved is adding a store to managed objects that are not thread-safe fault yourself, also... Object types within Core Data stack.mainContext ) uses 15 will you ever pass a managed context. You don ’ t be initialized in one thread and accessed from the correct queue be accessed from different! Or serialized queue ) confinement to protect managed objects that you use manage! From another entity exist within the same time the UI t Want to teach your to! Is because NSManagedObjectContext and a persistence store container the context will be associated with private!
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