Using NSSortDescriptor to sort Dates and nil values

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. …

Multiple Word, Random Order Search – CoreData & SwiftUI

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 …

Counting CoreData entries based on relationship entities

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:     …

Synchronizing Main and Background Core Data Threads (Swift 3)

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: …

Undo functionality in Core Data (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:     …

Sorting Multi Dimensional Array (Swift 3)

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 …

Copy one or multiple NSTableView rows, Swift

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 …