Save value from Action Sheet

Question

I am stuck on something dumb. This app is an OSX core-data app. I'm calling an action sheet to play with dates. The date selected is correctly shown on the screen after the sheet is closed. However, I cannot figure how to save the date.

Any help appreciated. This is the code I'm working with in my AppDelegate.m:

NSDate *theDate = [self.purchaseDatePicker dateValue];
    if (theDate)
    {
        NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
        NSString *formattedDateString;

        [formatter setDateStyle:NSDateFormatterMediumStyle];
        [formatter setTimeStyle:NSDateFormatterNoStyle];

        formattedDateString = [formatter stringFromDate:theDate];

        [self.purchaseDate setStringValue: formattedDateString];
        self.item.purchaseDate = theDate;
        [self.item setPurchaseDate:theDate];
        [self.item setPurchaseDate:self.item.purchaseDate];

        NSLog(@"theDate is %@", theDate); <-- this is fine.
        NSLog(@"item.purchaseDate is %@", self.item.purchaseDate); <-- this returns NULL

        NSError *error = nil;
        NSManagedObjectContext *moc = _coreDataController.mainThreadContext;
        if (![moc save:&error])
        {
            [[NSApplication sharedApplication] presentError:error];
        }
            }
}

Answer 1

I found the answers here very helpful, but this post really got me thinking. So today, the code looks like below, and it works great!!

1.

[itemArrayController setValue: [DatePicker1 dateValue] forKeyPath: @"selection.date1"];

2.

  if ([itemArrayController valueForKeyPath: @"selection.date1"] == NULL) {
        date1 = [NSDate date];
        [datePicker1 setDateValue: date1];
    } else {
        [datePicker1 setDateValue: [itemArrayController valueForKeyPath: @"selection.date1"]];
        date1 = [itemArrayController valueForKeyPath: @"selection.date1"];
    }