Join Simon Allardice for an in-depth discussion in this video Ordering with sort descriptors, part of Core Data for iOS and OS X.
So when I execute this fetch, I have all these entities being brought back but in a non-specific…order, and to order these in some fashion we use the same fetchRequest. It's exactly like this.…We just add to it.…We add a new very simple object called a sort descriptor in that so all it does is describe…a sort, and to do that it just needs two pieces of information, what attribute are we sorting…on title, author, releaseDate, and do I want that ascending or descending? So let's do that.…After I've created the fetchRequest I'm going to create a new instance of an NSSortDescriptor.…
And the init I'm going to use here is the initWithKey: ascending.…The key is just the name of the attribute I want to sort on, which for my case I'll…do releaseDate, and ascending is NO, meaning I'd like that descending.…Order by releaseDate descending, the highest one first.…If I misspelled the attribute name like I nearly did there, you'd find an error as soon…as you try to execute that fetchRequest, but you wouldn't catch it until runtime.…
- 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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