Join Simon Allardice for an in-depth discussion in this video Saving the managed object context, part of Core Data for iOS and OS X.
So I'm still in this simple Cocoa Application where I'm creating a new managed object based…on an entity I've described and just setting a few values of it.…I know this is being saved when the application terminates, but let's say I want it to save…immediately as soon as this object is created, rather than waiting for someone to quit.…And all I need to do that is call the save method of the Managed Object Context.…To prepare for that, I need to create an NSError reference here. I'll just call this error.…
Though it can be nil, I actually don't need an NSError object, I just need something to…hold one and the pass that into the save method.…Now there is a method in App Delegate itself that returns the Managed Object Context, so…that's the easiest way to call it and then say save and passing in the address of that error pointer.…This would do it here; however, this method, call, the call to save will return a Bool,…so it's going to be yes or no, yes if this is successful, no if it isn't.…
So it's very common to actually wrap this in an if statement. Let's quickly do that.…
- Understanding Core Data and object persistence frameworks
- Creating a Core Data project
- Exploring data modeling
- Creating entities, attributes, and relationships
- Creating managed objects
- Fetching in Core Data
- Implementing undo and redo support
- Creating a Core Data Cocoa app without code
- Responding to validation issues
- Converting store types
- Preloading default data
Skill Level Intermediate
Q: In the CoursesViewController.m file, I receive a message that the method dismissModalViewControllerAnimated is no longer supported by Apple. Is there a newer method to use?
A: You may have received the warning that a call to the dismissModalViewControllerAnimated: method is now deprecated.
This is a recently deprecated method, so the code _will_ continue to work using that call, but to remove the warning, change the code from:
to the current recommended version:
[self dismissViewControllerAnimated:YES completion:nil];
It should take care of that message.
1. Getting Started
2. Modeling in Core Data
3. Saving in Core Data
Creating managed objects12m 46s
4. Fetching in Core Data
Using predicates9m 32s
5. Putting It Together: iOS
6. Putting It Together: Cocoa
7. Store Types and Model Changes
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