Jay Versluis

I didn’t realise that Apple offer professional support for people like you and me. An engineer will work directly with your problem on a per-incident basis, for only $50 per session. This is an invaluable resource if you’re stuck with a problem that neither forums nor Google can solve. You need to be an Apple […]

The NSFetchedResultsController makes populating UITableViews a breeze. I keep forgetting how to set those up, so here’s a quick list on how to create those: create a Fetch Request create the Fetched Results Controller with the Fetch Reuqest execute the Fetch The Fetch Request itself needs: a Managed Object Model an Entity Name (i.e. what […]

Apple’s recommended method for dealing with “bring your own store files” for Core Data is to copy the store file into your app’s Documents directory, where it can be accessed for read and write queries. However, if you don’t need to write to your store file, then you can also add a provided store file […]

You can store a UIImage (or an NSImage on Mac) as raw data. This can be useful if you’d like to save this in Core Data. Here’s how you convert a UIImage into NSData: NSData *imageData = UIImagePNGRepresentation(yourImage); To convert NSData back to a UIImage, you can do this: UIImage *image = [[UIImage alloc]initWithData:yourData]; The […]

Core Data is great. But when you add it to an existing project Xcode throws some random error messages at you that make you doubt your sanity. Again. Legitimately copied and pasted code from Apple’s own templates generates totally useless errors such as Receiver type ‘NSManagedObjectContext’ for instance message is a forward declaration. This isn’t […]