I am working on a Mac & iOS App, with iCloud CoreData in between to synchronize the data.
When I update some thing from iOS App, and the updates are already migrated to the PersistentStore in Mac App while the Mac App is running. The problem is I cannot find an effective way to force the NSArrayController to reload all data from the store.
tried -(void) fetch:(id)sender; only can see the delete or added entity, but the updated model property not refreshed...
Please help. Thanks
If you see the latest data in the managed object context, but not in the array controller, you want:
[_yourManagedObjectContext processPendingChanges];
[_yourArrayController fetchWithRequest:nil merge:YES error:&error];
[_yourArrayController rearrangeObjects];
I use this in a Mac/iOS iCloud app to update the Mac app's data when the iCloud store changes.
Following is the reply from Apple's Developer Technical support. It worked for me. Thanks all for providing solutions.
For the OS X app, when reloadFetchResults is called, you can ask the NSManagedObjectContext to reset itself and perform the fetch again.
- (void)reloadFetchedResults:(NSNotification *)note
{
NSDictionary *userInfoDict = [note userInfo];
NSManagedObjectContext *moc = self.coreDataController.mainThreadContext;
// this only works if you used NSMainQueueConcurrencyType
// otherwise use a dispatch_async back to the main thread yourself
//
[moc performBlock:^{
[self mergeiCloudChanges:userInfoDict forContext:moc];
[moc reset];
[self.tableArrayController fetch:self];
}];
}
I've found that
[self.managedObjectContext reset];
[myArrayController fetch:self];
forces my NSTableView (with NSArrayController) to re-populate and display newly processed NSManagedObjects.
in case someone else finds this... in my case, I was building the array from user interaction (not Core Data), and then trying to show the tableView when they were done (on the same window)... and of course... seeing nothing!
[arrayController rearrangeObjects];
just before I wanted to show the tableView fixed it for me.
