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. There are countless good tutorials on this subject, look for the one on RayWenderlich for example. Do yourself a favor and dont use core data, learn how to convert that array of strings to Data and write that data to a file you create on the user’s disk. In Core Data, an attribute can be of one of several data types. The saving of the data works fine. Using Transformable type, solution is simple: “You can store an NSArray or an NSDictionary as a transformable attribute. In this series, I will work with Xcode 7.1 and Swift 2.1. It depends on what you are trying to achieve. I have no problems to fetch Data in Objective-C but in swift I dont get it! Is it just an array of strings? Show activity on this post. Do you mind linking some tutorial how to do it? Help! Two arrays are required to create a dictionary. Press question mark to learn the rest of the keyboard shortcuts. If it's just 10, just go with UserDefaults. I saw that one but it didn't explain how to save the array, unless I missed it somehow. Introduction. 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). In this article, we will see how to create it and some internal behaviors to avoid troubles. Apple describes ArraySlice as “Views onto Arrays”.It means that an ArraySlice is an object which represents a subsequence of its array. On the Watch OS I check if WCSession is supported and active a session, then send the iOS application a message from the watchOS extension. Do you want to search them. A new grouping initializer makes it a snapto build a dictionary from a sequence of values,grouped by keys computed from those values.We’ll use this new initializer to build a dictionary of groceriesgrouped by their department. Hello everyone. how many? However, I question whether NSUserDefaults is the right option here. Why your ported Objective-C code gives you compile errors when reading from your Dictionary. Why you cannot downcast your values to certain data types. Here is an example of my code where sections is keys for the dictionary and Company as an array of core data objects. At the top of MovieList, change the line declaring the movies array to an empty array like below: @State var movies: [Movie] = [] The @State property wrapper is a vital piece of the SwiftUI data flow. First, open MovieList.swift.You’ll find the movies for the list stored in a simple movies array. An array (in Swift 4) can have any element type. For example, we are saving to disk all the stocks & cryptocurrencies in your watchlist, for our Finance App Template . 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. 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. There is no "native" array or dictionary type in Core Data. This class handles all your Core Data setup and data importing. Is there more data? 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. 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.. Let's see how this code would look if we adopted NSBatchInsertRequest. With dictionary elements, we create a collection of lookup tables. What do I declare inside my NSManagedObject class? var array1 = [ key1 , key2 , key3] This will use the NSCoding to serialize the array or dictionary to an NSData attribute (and appropriately deserialize it upon access). The syntax sucks as any other database language but once you get used it works well. Next, replace the names property definition with the following: Saving to Core Data. Question or problem in the Swift programming language: I want to save the attributedString of my UItextview’text. In the following example, we shall create a dictionary with some initial values, and extract the arrays with keys and values separately. One array is used as keys and the other array is used as values. SpriteKit- How to zoom-in and zoom-out of an SKScene? Then we save. If you prefer Objective-C, then I recommend reading my earlier series on the Core Data framework. 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. Open Persistence.swift. This will use the NSCoding to serialize the array or dictionary to an NSData attribute (and appropriately deserialize it upon access)” – Source. What do I declare inside my .xcdatamodel? Sep 12, 2016. Posted by 2 years ago. r/swift: Swift is a general-purpose programming language built using a modern approach to safety, performance, and software design patterns. Close. How can I show all saved data? I need to be able to save this data … NSManagedObject itself is very much like a dictionary. The values inside that array, and the number of values are variable. So I am pinging an API and it returns a JSON object, and I can convert that JSON object into instances of my structs, that part I have no problems with. Then one entity would have set of these related entities. (I use MagicalRecord). As we saw in the previous series about Core Data and concurrency, if we don’t use the persistent container and we want to save a private NSManagedObjectContext, then we must save the main NSManagedObjectContext manually. You’ll see a class called PersistenceController. So I thought I’d cover some of the answers I’ve given on different forums in this post. How to solve the problem: Solution 1: You should load all your Objects from CoreData into an Array/Dict of NSManaged Objects. While doing this I found that a common question is how to read data from a Dictionary in Swift. Is it better to use core data, sqlite or something else? Archived. Instead, when you retrieve objects from a Core Data store, you use a fetch request. But when I back to set the text’attributedString,it not work. 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 … let newManagedObject = NSEntityDescription.insertNewObjectForEntityForName(entity.name!, inManagedObjectContext: context) let … 2. Do you need indexes? Following is the syntax to create a dictionary from two Arrays. Help! We build a complex, nested data structure. I am looking how to solve the problem: Solution 1: you should load all your Core Data almost. 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