Objective-C Fundamentals

250 CHAPTER 12 Reading and writing application data
NSManagedObject subclass from the iOS > Core Data section.
Click Next and select the PocketTasks data model.
Click Next again and put a checkmark next to Person and
Task (see figure 12.6).
Finally, click Finish.
Build and run the application. Your project should still
work just as before.
When you examine the source files for the Person and
the Task classes, you’ll find accessors for your properties
and relationships. Let’s add one method to the Person
class. Open Person.h and add this line:
@property (readonly) NSString *fullName;
Next, open Person.m and add the implementation:
- (NSString *)fullName {
return [NSString stringWithFormat:@"%@ %@",
self.firstName, self.lastName];
}
Now you have the code to put together the full name in a
Figure 12.5 Tasks can be
added and marked as done by
single place: in the model. You can see why it almost always
tapping on them. Completed
makes sense to work with these NSManagedObject subclasses
in your Core Data project: it’s easier to access the the right.
tasks have a checkmark on
properties and relationships, it gives you the opportunity to
add custom logic to your models, and it makes the code easier to read and maintain.
Figure 12.6 Xcode can automatically generate Objective-C classes for the entities
in a data model.