I was wondering how to update with core data. I can create, read, and delete, but I don't know how to update. If anyone could share some sample code of updating with core data, that would be amazing. Thank you.

Are you working with a Master / Detail scenario?

Not very well acquaintedwith Core Data, but in my project I use json files. To update an item I search to see if the item for that ID is in my collection, if so I remove that item and insert the new, changed, item with the same ID.

Something similar should work with core data I pressume ...