核心数据删除不起作用

Question

您好，我正在尝试删除我在波纹管编码中保存的核心数据值，但它显示已删除，当我再次运行它显示的项目包括已删除的值意味着它没有从核心数据中删除

谁能帮我解决这个问题...

    - (IBAction)Delete:(id)sender
    {

        AppDelegate * appdel = (AppDelegate *)[[UIApplication sharedApplication]delegate];
        NSString *soughtPid= self.text1.text;

        NSEntityDescription * productEntity = [NSEntityDescription entityForName:@"Students" inManagedObjectContext:appdel.managedObjectContext];
        NSFetchRequest *fetch=[[NSFetchRequest alloc] init];
        [fetch setEntity:productEntity];
        NSPredicate *p=[NSPredicate predicateWithFormat:@"name == %@", soughtPid];
        [fetch setPredicate:p];
        //... add sorts if you want them
        NSError *fetchError;
        NSArray *fetchedProducts=[appdel.managedObjectContext executeFetchRequest:fetch error:&fetchError];
        // handle error
        for (NSManagedObject *product in fetchedProducts) {
            [appdel.managedObjectContext deleteObject:product];



            NSLog(@"Deleted Names : %@",[product valueForKey:@"name"]);
            NSLog(@"****.......*****");
        }
         [tableview reloadData];
    }

Core Data Available values are 4 mentioned bellow.

2015-10-24 16:47:23.588 usecoredattuts[2293:108804] Names : Rahman
2015-10-24 16:47:23.589 usecoredattuts[2293:108804] Names : Karthi
2015-10-24 16:47:23.589 usecoredattuts[2293:108804] Names : Ravi
2015-10-24 16:47:23.589 usecoredattuts[2293:108804] Names : Abdul

After deleted one value mentioned bellow

2015-10-24 16:47:31.986 usecoredattuts[2293:108804] Deleted Names : Ravi

When fetching the core data values show like this

2015-10-24 16:47:41.521 usecoredattuts[2293:108804] Names : Rahman
2015-10-24 16:47:41.521 usecoredattuts[2293:108804] Names : Abdul
2015-10-24 16:47:41.521 usecoredattuts[2293:108804] Names : Karthi

Final After stoping the xcode and again when run the project I got the bellow names.

2015-10-24 16:52:10.438 usecoredattuts[2308:110460] Names : Rahman
2015-10-24 16:52:10.438 usecoredattuts[2308:110460] Names : Karthi
2015-10-24 16:52:10.438 usecoredattuts[2308:110460] Names : Ravi
2015-10-24 16:52:10.438 usecoredattuts[2308:110460] Names : Abdul

That means the name Ravi was not deleted

有人可以帮我解决这个问题......

Answer 1

   for (NSManagedObject *product in fetchedProducts) {
        [appdel.managedObjectContext deleteObject:product];

        NSLog(@"Deleted Names : %@",[product valueForKey:@"name"]);
        NSLog(@"****.......*****");
    }

    //After delete. Save the context
    NSError *error = nil;
    [appdel.managedObjectContext save:&error];

   //Rest of your code......

这将解决您的问题。

核心数据删除不起作用

Core Data Delete not working

iphone

objective-c

ios

ios5

ios7