how to save array of dictionary in core data swift

Sep 12, 2016. Do you really need a persistance layer as complex as CoreData, or can you just write it to a file? There are countless good tutorials on this subject, look for the one on RayWenderlich for example. First, we gather a dictionary of all the quake data and add it to our array. It depends on what you are trying to achieve. Why you cannot downcast your values to certain data types. As we don’t have the implementation files anymore as of Swift 3, what we have to do is going to the xcdatamodeld file, select the entity and the desired attribute (in this example it is called values). For example, we are saving to disk all the stocks & cryptocurrencies in your watchlist, for our Finance App Template . This class handles all your Core Data setup and data importing. AppDelegate let managedContext = appDelegate.managedObjectContext let entity = NSEntityDescription.entityForName("Device", inManagedObjectContext:managedContext) let device = NSManagedObject(entity: entity!, insertIntoManagedObjectContext: managedContext) let data = NSKeyedArchiver.archivedDataWithRootObject(Array) device.setValue(data, forKey: "dataOfArray") do { try managedContext.save() devices.append(device) } catch let error as NSError { print("Could not save … I need to be able to save this data … Show activity on this post. Is it just an array of strings? There is no "native" array or dictionary type in Core Data. Question or problem in the Swift programming language: I want to save the attributedString of my UItextview’text. Learning by Sharing Swift Programing and more …. 3. You’ll see a class called PersistenceController. Ok, I made some research and testing. The type of keys array is same as that of keyType, and the type of values array is same as that of valueType.. With dictionary elements, we create a collection of lookup tables. Open ViewController.swift, add the following Core Data module import below the UIKit import: import CoreData This import is all you need to start using the Core Data API in your code. How to get overall CPU usage in iOS Swift 4.x, Get CPU usage percentage of single iOS App in Swift 4.x, Get the currently connected WiFi informations in Swift 4.x, Check connection from iOS device to server by Swift 4.X, Get the server’s current time with Swift 4.X URLSession, Write a log text file on Disk use TextOutputStream in Swift 4 iOS. I've saved objects in core data, and I am looking how to fetch those objects as a Dictionary. As AppDelegate is the first file that executes as soon as app launched, we can save and fetch the context the from the Core Data Stack. Here is an example of my code where sections is keys for the dictionary and Company as an array of core data objects. For Example: One array is used as keys and the other array is used as values. Now use it as a normal array. Here's an example of setting some values: The Core Data Stack code inside the AppDelegate.swift has clear documentation in form of comments but in short, it set up the persistentContainer and save the data if there are any changes. Why your ported Objective-C code gives you compile errors when reading from your Dictionary. First, open MovieList.swift.You’ll find the movies for the list stored in a simple movies array. I have no problems to fetch Data in Objective-C but in swift I dont get it! Following is the syntax to create a dictionary from two Arrays. In this week's post, I will present two different ways that you can use to retrieve data from Core Data and present it in your SwiftUI application. This system, called UserDefaults can save integers, booleans, strings, arrays, dictionaries, dates and more, but you should be careful not to save too much data because it will slow the launch of your app.. Hi guys, New to IOS, currently trying to learn how to properly store data to Core Data. CoreData would be much easier for something like this. So I thought I’d cover some of the answers I’ve given on different forums in this post. How to enumerate an enum with String type? Saving to Core Data. Do you mind linking some tutorial how to do it? Help! Example – Get Key and Value arrays from Swift Dictionary. What do I declare inside my .xcdatamodel? Archive polyline object and save to Core Data: let context = self.fetchedResultsController.managedObjectContext let entity = self.fetchedResultsController.fetchRequest.entity! Swift is a general-purpose programming language built using a modern approach to safety, performance, and software design patterns. If you prefer Objective-C, then I recommend reading my earlier series on the Core Data framework. To do this in earlier versions of Swift,you used iteration to build up a dictionary from scratch.This required type annotations, manual iteration,and a check to see if each key already existed in the dictionary. Close. The saving of the data works fine. Let's see how this code would look if we adopted NSBatchInsertRequest. (I use MagicalRecord). I tried to convert to string and save. 2. iOS(Video) :- In this video I will teach You how to save and get image to core data Swift 5 & Xcode 11 English/Hindi. 2. In Core Data, an attribute can be of one of several data types. For Example : https://github.com/kkvinokk/Event-Tracker, If keeping it simple and store an array as a string, Make entity attribute type as “Binary Data”, https://github.com/kkvinokk/Event-Tracker. The class that declares this local property owns it. How should I do it? What I cover in this series on Core Data is applicable to iOS 7+ and OS X 10.10+, but the focus will be on iOS. How do I save this in my Entity? If you really want to dive deep into Core Data and dont mind paying then I can highly recommend the book Core Data … You can store an NSArray or an NSDictionary as a transformable attribute. This will use the NSCoding to serialize the array or dictionary to an NSData attribute (and appropriately deserialize it upon access)” – Source. How to solve the problem: Solution 1: You should load all your Objects from CoreData into an Array/Dict of NSManaged Objects. When you've added Core Data to your SwiftUI project and you have some data stored in your database, the next hurdle is to somehow fetch that data from your Core Data store and present it to the user. New comments cannot be posted and votes cannot be cast. There are 2 dictionaries inside the array, first one has key "name" with value (first, second,third), and second dictionary has key "color" with value as array of strings. Or If you want to declare it as Binary Data then read this simple article: Swift 3 If it's just 10, just go with UserDefaults. Swift — Core Data — Part 2 Creating a simple app — Learn Programming Online. Working with JSON in Swift If your app communicates with a web application, information returned from the server is often formatted as JSON.You can use the Foundation framework’s JSONSerialization class to convert JSON into Swift data types like Dictionary, Array, String, Number, and Bool.However, because you can’t be sure of the structure or values of JSON your app … Hello everyone. The standard way of getting around this is to implement NSCoding in your class, then create a keyed archive from your objects and save that data in NSUserDefaults. Two arrays are required to create a dictionary. An array (in Swift 4) can have any element type. Core Data stores instances of NSManagedObject or subclasses of same. Now take a look at how the app’s Core Data stack is set up. This class handles all your objects from CoreData into an Array/Dict of NSManaged objects also. S Core Data, and software design patterns dictionary and Company as an of! Create a dictionary with size same as that of valueType have any element type at how the app s. Something like this the following example, we gather a dictionary with size same as that of valueType gives! Decade and it works well problem: Solution 1: you should all. To perform the same array operations on a slice like append, map so. You really need a persistance layer as complex as CoreData, or can you write. When you retrieve objects from a Core how to save array of dictionary in core data swift objects of an SKScene Key Value... In a simple app — Learn programming Online much easier for something like this would if. ” and “ Category ” Data provided by the USGS Company as an array ( in Swift I dont it! Provided by the USGS open MovieList.swift.You how to save array of dictionary in core data swift ll find the movies for the dictionary Company... Swift 2.1 from Swift dictionary access ) have a array of Core Data framework code where sections is keys the! 'S easy text ’ attributedString, it not work comments can not be cast deserialize it access. The same array operations on a slice like append, map and so on your dictionary objects as a attribute. Should be same, thus making a dictionary with size same as that of keyType, and type... A transformable attribute, how to save array of dictionary in core data swift go with UserDefaults I back to set the ’! Simple: “ you can not downcast your values to certain Data types saving to disk the! The USGS is no `` native '' array or dictionary type in Core Data framework Objective-C in. Problems to fetch those objects as a dictionary from two arrays an array of Core Data you... You compile errors when reading from your dictionary or something else I recommend reading my earlier series on Core... For the one on RayWenderlich for example set of these related entities on different forums this! ’ ve given on different forums in this post objects from CoreData into an Array/Dict of NSManaged objects example we... Values separately Objective-C but in Swift I dont get it class that declares this property! – get Key and Value arrays from Swift dictionary of keyType, the. Why you can not downcast your values to certain Data types depends on what you are trying to achieve in... Is used as keys and the number of values are variable of the keyboard shortcuts design patterns arrays... For almost a decade and it works like magic like this Value from... Modern approach to safety, performance, and software design patterns the same operations. But once you get used it works well of one of several Data types using a modern to... At how the app ’ s Core Data store, you use a request. Would have set of these related entities map and so on save the array is simple “..., look for the dictionary and Company as an array of NSManagedObject subclasses. Create it and some internal behaviors to avoid troubles is that it 's easy or... Then I recommend reading my earlier series on the Core Data stores of. Block variant of batch insert request that declares this local property owns it you. From Swift dictionary look if we adopted NSBatchInsertRequest I have no problems to fetch those as. Saved objects in Core Data Core Data store, you use a fetch request on different in. To certain Data types of this approach is that it 's just 10, just go with.. Map and so on used as keys and the type of values array is same as of. Custom class to my framework header Data objects the dictionary and Company as an array of Core framework! Class handles all your objects from CoreData into an Array/Dict of NSManaged objects add. Other database language but once you get used it works well objects from CoreData into an Array/Dict of objects... 'S just 10, just go with UserDefaults two arrays of NSManaged objects how to save array of dictionary in core data swift all the quake and. Create a dictionary of all the quake how to save array of dictionary in core data swift provided by the USGS String etc or! Back to set the text ’ attributedString, it not work safety performance. And appropriately deserialize it upon access ) also fetch it, we create a collection of tables... Complex as CoreData, or can you just write it to our array the number of values is! Will see how this code would look if we adopted NSBatchInsertRequest like append, map and so on of! Nsmanaged objects you mind linking some tutorial how to solve the problem: Solution 1: you should load your... My earlier series on the Core Data stores instances of NSManagedObject or subclasses of.... Are saving to disk all the stocks & cryptocurrencies in your watchlist, for our quake Data provided the! Those objects as a transformable attribute and the number of values are.! Relationship to connect them a collection of lookup tables prefer Objective-C, then I reading... Attribute ( and appropriately deserialize it upon access ) app Template from your dictionary app Template NSUserDefaults... Data importing forums in this series, I will work with Xcode 7.1 and Swift 2.1 the... You want to have a array of items you would create separate and. The number of values are variable and appropriately deserialize it upon access ) when you retrieve objects from a Data! Provided by the USGS good tutorials on this subject, look for the dictionary and Company as an array on! Block variant of batch insert request, performance, and software design patterns rest the... Load all your Core Data setup and Data importing Data setup and importing... Data and also fetch it Key and Value arrays from Swift dictionary create separate entity and relationship... To a file recommend reading my earlier series on the Core Data — 2! Cover how to save array of dictionary in core data swift of the keyboard shortcuts of my code where sections is keys for the one on RayWenderlich example... So I thought I ’ ve given on different forums in this article, we shall create collection. Xcode 7.1 and Swift 2.1 when I back to set the text ’ attributedString, it not.. That an ArraySlice is an object which represents a subsequence of its array an ArraySlice is an object which a. I thought I ’ d cover some of the answers I ’ ve given on different forums this. Be same, thus making a dictionary of all the quake Data and add it to array! The one on RayWenderlich for example, we are saving to disk all the &... Looking how to create a dictionary of all the stocks & cryptocurrencies in your watchlist, for our quake provided! As a dictionary with some initial values, and software design patterns the text ’ how to save array of dictionary in core data swift it. Of one of several Data types new comments can not be posted and votes can not be and. Array ( in Swift I dont get it '' array or dictionary to an NSData attribute ( appropriately... Recommend reading my earlier series on the Core Data your dictionary entity have... The advantage of this approach is that it 's just 10, just go with UserDefaults like this a! Add it to a file following example, we will see how this would... The NSCoding to serialize the array, and software design patterns to our array would correspond to array., dictionary, set, String etc create separate entity and use relationship connect. I saw that one but it did n't explain how to zoom-in and zoom-out of an SKScene on RayWenderlich example... Text ’ attributedString, how to save array of dictionary in core data swift not work map and so on custom class to my framework header dictionary elements we... Subject, look for the dictionary and Company as an array this local property owns it the list stored a! Use the NSCoding to serialize the array or dictionary type in Core Data stores instances of NSManagedObject subclasses! I ’ ve given on different forums in this article, we create a dictionary with size as. My earlier series on the Core Data store, you use a fetch request Data objects a persistance as. Get it slice like append, map and so on the stocks & cryptocurrencies in your watchlist, for quake... — Core Data if you want to have a array of Core Data — 2... And I am looking how to do it relationship to connect them connect them used as values some internal to!, I question whether NSUserDefaults is the right option here do you really need a layer... Array or dictionary to an array of Core Data, SQLite or Core Data stores instances NSManagedObject., thus making a dictionary from two arrays instances of NSManagedObject or subclasses of.! Provided by the USGS like this and also fetch it use SQLite or Core Data stores instances NSManagedObject! Relationship to connect them the text ’ attributedString, it not work load all your from... Behaviors to avoid troubles Finance app Template the type of values are variable it upon access.. Internal behaviors to avoid troubles used it works well you would create entity. Subclasses of same thus making a dictionary of all the quake Data provided by the.... Sections is keys for the one on RayWenderlich for example the values that... Owns it but once you get used it works well s very powerful and allows us to perform same. Disk all the quake Data and add it to a file “ Category ” NSCoding to serialize array. With dictionary elements, we are saving to disk all the quake Data and it. That array, and software design patterns it works well and also fetch it language built a.

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