iPhone4 Core Data如何插入带有节号的新对象？
我试图将新对象插入到我的核心数据结构中，并让它们知道它们属于哪个部分。
这是我的插入方法，我需要将某个部分添加到新记录中。
-(void)insertNewReminderWithSequenceNumber:(int)sequenceNumber
{
// Create a new instance of the entity managed by the fetched results controller.
NSManagedObjectContext *context = [self.remindersController managedObjectContext];
NSEntityDescription *entity = [[self.remindersController fetchRequest] entity];
Reminder *newManagedObject = (Reminder*)[NSEntityDescription insertNewObjectForEntityForName:[entity name] inManagedObjectContext:context];
newManagedObject.sequenceNumber = [NSNumber numberWithInt:sequenceNumber];
}
这是我的检索方法，请注意，我将该部分设置为零。
-(Reminder*)getReminderAtIndex:(int)index
{
NSIndexPath* temp = [NSIndexPath indexPathForRow:index inSection:0];
Reminder* reminder = nil;
@try {
reminder= [self.remindersController objectAtIndexPath:temp];
}
@catch (NSException *exception) {
NSLog(@"Exception accessing event at index: %i", index);
return nil;
}
@finally {
}
return reminder;
}
如何将对象插入到核心数据中，以便能够通过包含节号和行号的索引路径检索它们？
谢谢！
I'm trying to insert new objects into my core data structure and have them know which section they belong to.
Here's my insert method, I need to add a certain section to the new record.
-(void)insertNewReminderWithSequenceNumber:(int)sequenceNumber
{
// Create a new instance of the entity managed by the fetched results controller.
NSManagedObjectContext *context = [self.remindersController managedObjectContext];
NSEntityDescription *entity = [[self.remindersController fetchRequest] entity];
Reminder *newManagedObject = (Reminder*)[NSEntityDescription insertNewObjectForEntityForName:[entity name] inManagedObjectContext:context];
newManagedObject.sequenceNumber = [NSNumber numberWithInt:sequenceNumber];
}
Here's my retrieve method, note that I set the section to zero.
-(Reminder*)getReminderAtIndex:(int)index
{
NSIndexPath* temp = [NSIndexPath indexPathForRow:index inSection:0];
Reminder* reminder = nil;
@try {
reminder= [self.remindersController objectAtIndexPath:temp];
}
@catch (NSException *exception) {
NSLog(@"Exception accessing event at index: %i", index);
return nil;
}
@finally {
}
return reminder;
}
How can I insert objects into core data to be able to retrieve them by indexPath containing both section number and row number?
Thank you!
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只需使用提供的方法
objectAtIndexPath：这与如何将对象插入托管对象上下文无关。相反，您必须使用
NSFetchedResultsController的sectionNameKeyPath参数指定您的部分。Simply use the provided method
objectAtIndexPath:This has nothing to do with how you insert the object into the managed object context. Rather, you will have to specify your sections with the
sectionNameKeyPathparameter of yourNSFetchedResultsController.