Question

我被困在愚蠢的事情上。这个应用程序是OSX核心数据应用程序。我正在调用一个动作表来播放日期。关闭工作表后，屏幕上会正确显示所选日期。但是，我无法想出如何保存日期。

任何帮助表示赞赏。这是我在AppDelegate.m中使用的代码：

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

我发现这里的答案非常有用，但这post让我思考。所以今天，代码看起来如下，它的效果很棒！

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"];
    }

从行动表中节省价值

1 个答案: