Question

I’ve looked through all the class documentation for Core Data and I can’t find away to programmatically update values in a core data entity. For example, I have a structure similar to this:

 id  | title ============   1  | Foo     2  | Bar     3  | FooFoo 

Say that I want to update Bar to BarBar, I can’t find any way to do this in any of the documentation.

Answer 1

The Apple documentation on using managed objects in Core Data likely has your answer. In short, though, you should be able to do something like this:

NSError *saveError; [bookTwo setTitle:@'BarBar']; if (![managedObjectContext save:&saveError]) {     NSLog(@'Saving changes to book book two failed: %@', saveError); } else {     // The changes to bookTwo have been persisted. } 

(Note: bookTwo must be a managed object that is associated with managedObjectContext for this example to work.)