nsmanagedobjectcontext

In core data for the iPhone, I was getting all sorts of errors trying to save data to a NSManagedObjectContext . I believe that my issues were all to do with me using a NSManagedObjectContext that was being used in multiple threads. So I wanted to create a new NSManagedObjectContext and try that, but I cannot find the example code to simply create a new instance... I know its simple, but I would really appreciate any help here. Note, I have seen this article on the Apple docs: http://developer.apple.com/iphone/library/documentation/cocoa/conceptual/CoreDataUtilityTutorial/Articles/05

I am trying use CoreData, but when I add it to my project I only get two new methods : - (NSPersistentContainer *)persistentContainer and - (void)saveContext Now I can't get old methods to work with CoreData , and I can't find any tutorials with these new methods and Objective-C. How can I save and get data from CoreData using persistentContainer in Xcode 8 with Objective-c? You can Get context as - let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext or as in Objective-C NSManagedObjectContext *context = ((AppDelegate*)[[UIApplication sharedApplication

Possible Duplicate: Store But Don't Save NSManagedObject to CoreData? I need to make an NSManagedObject without saving it, how can I do this? The reason I want to do this is the app has a setup in which the user enters their details, however I only want to save the object if they complete the setup (they have the option to cancel, in which case the object needs to be discarded without being saved, which is why I don't want to insert it straight away). I have tried insetting one without a context but the app crashes. I have tried the following: GuestInfo *guest; guest = (GuestInfo *)

Is initializing a NSManagedObjectContext using NSMainQueueConcurrencyType only for the situation where that MOC has a child MOC that was initialized using NSPrivateQueueConcurrencyType ? To give some background: my app has a traditional structure whereby the main table view is driven by a NSFetchedResultsController and data are imported asynchronously from a web service using an NSOperation subclass that has its own MOC. I wasn't sure whether both MOCs in that situation should use NSConfinementConcurrencyType (the default, I believe) or whether the MOC associated with the fetched results

I have a NSManagedObjectContext in which I have a number of subclasses of NSManagedObjects such that some are containers for others. What I'd like to do is watch a top-level object to be notified of any changes to any of its properties, associations, or the properties/associations of any of the objects it contains. Using the context's 'hasChanges' doesn't give me enough granularity. The objects 'isUpdated' method only applies to the given object (and not anything in its associations). Is there a convenient (perhaps, KVO-based) was I can observe changes in a context that are limited to a