Question

我正在制作Iphone应用程序，我想更改Core Data中的一个值。通常我只在表视图中的索引路径方法中完成了didselect行。现在我来自一个表视图并进入其中一个单元格，并希望对viewController中该单元格中的一个属性进行更改。

执行此操作：NSManagedObject *d = [self.model.frc_Work objectAtIndex:1];会给我一个错误。

//The way I have done it before

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath

{
          NSManagedObject *d = [self.model.frc_Work objectAtIndexPath:indexPath];
          [d setValue:[NSNumber numberWithInt:1] forKey:@"status"];
}


//How do I do it this way 
- (IBAction)btnDone:(id)sender {

    NSManagedObject *d = [self.model.frc_Work objectAtIndex:1];

    [d setValue:self.tvTheNote.text forKey:@"notes"];

    [self.model saveChanges];

    self.tvTheNote.text = @"";

    [self dismissModalViewControllerAnimated:YES];
}

我的Frc代码是：

 - (NSFetchedResultsController *)frc_Work

{

// If the frc is already configured, simply return it

if (_frc_Work) return _frc_Work;



// Otherwise, create a new frc, and set it as the property (and return it below)

_frc_Work = [_cdStack frcWithEntityNamed:@"Work" withPredicateFormat:nil predicateObject:nil sortDescriptors:@"title,YES" andSectionNameKeyPath:nil];



return _frc_Work;

}

Answer 1

使用...

创建索引路径

NSIndexPath rowIndexPath = [NSIndexPath indexPathWithIndex:1];

然后致电：

NSManagedObject *d = [self.model.frc_Work objectAtIndexPath:rowIndexPath];

在View Controller IOS中更新Core Data中的属性

1 个答案: