by Marc Maset
Today I’ve been working on sorting tasks, as I’m using swiftUI and CoreData I use a FetchRequest with the following SortDescriptor: NSSortDescriptor(keyPath: \Task.targetDate, ascending: true) The idea being it will sort based on the task due date from smallest to the largest, meaning you’ll see the ones you should act on first at the top. …
Continue reading “Using NSSortDescriptor to sort Dates and nil values”
Today I worked on the search functionality for the upcoming Product Management app. Given that this app will contain lots of long notes, having good search is essential. In most cases & for most apps, a simple one to one comparison will do the job great -like in the above image-. Here’s how a predicate implementation …
Continue reading “Multiple Word, Random Order Search – CoreData & SwiftUI”
As I continue working on the new product management app, I was trying to get a quick CoreData count. To be precise, I needed to get the count for how many of its relationships met a given criteria. There’s quite a few approaches but none as clean as “the filter”: Using it for boolean arguments: …
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This last couple of months I’ve been hard at work on two new projects, the first of which will be released fairly soon! But, today I wanted to write about something else: CoreData Concurrency. Since the release of Denarius about a year ago I’ve been regularly improving the personal finance app with new features and, …
Let’s say we have two different managedObjectContext (with one persistentStoreCoordinator). The first one is used across the app for most quick fetches: var mainManagedObjectContext = NSManagedObjectContext(concurrencyType: NSManagedObjectContextConcurrencyType.mainQueueConcurrencyType) mainManagedObjectContext.persistentStoreCoordinator = coordinator And the second, running in the background, for the queries that take a long time: var backgroundManagedObjectContext = NSManagedObjectContext(concurrencyType: …
Continue reading “Synchronizing Main and Background Core Data Threads (Swift 3)”
If you’re developing a Core Data based application for Mac, wouldn’t it be great if you could add undo support? Well, turns out that is a couple of lines away. Follow the simple steps: 1. Make sure your managedObjectContext has an undo manager, without it Core Data can’t keep track of the changes: …
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Hello all, This one I’ve found specially useful when working with Core Data fetched arrays. Let’s say that we want to sort the result of a fetch request based on the value of the field “gold”, we would therefore do the following: let dwarfGoldBags = … //Contains the result of a fetch request with one of the …
Continue reading “Sorting Multi Dimensional Array (Swift 3)”
So here’s a simple yet tricky one: you’ve created your NSTableView but now you would like to allow a user to copy to the clipboard one, or a couple of rows. How do you do it? 1. Implement the function copy (func copy(sender: AnyObject?){}), do not confuse with the method for duplicating an object. 2. Get the …
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A new app I’m working on has a Core Data back end and I wanted to implement a quick way to export all the entities into a CSV file and dump it into the Desktop. Here are the snippets to do it: 1. Make sure you get the NSObjects you want to export (in this case …