在核心数据中保存/获取数据的不一致性

我在这里的第一篇文章，直截了当 .

我遇到了一个问题，我不确定是保存数据还是获取数据 . 这是我的代码，我试图在我的实体中保存数据，“序列” . 该实体由2个属性“seqForWk1CD”和“seqForWk2CD”组成 .

AppDelegate *delegate = [[UIApplication sharedApplication]delegate];
NSManagedObjectContext *context = [delegate managedObjectContext];
SequenceMO *seqEntity = [NSEntityDescription 
insertNewObjectForEntityForName:@"Sequence" 
inManagedObjectContext:context];
// some other code
seqEntity.seqForWk1CD = arrForWk1;
seqEntity.seqForWk2CD = arrForWk2;
NSLog(@"%@", arrForWk1);
NSLog(@"%@", arrForWk2);
NSError *error = nil;
if (context != nil) {
    if ([context hasChanges] && ![context save:&error]) {
        NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
            abort();
        }
    }

打印时，数组将始终显示数组的内容 .

这是我尝试获取数据的地方 .

AppDelegate *delegate = [[UIApplication sharedApplication]delegate];
NSManagedObjectContext *context = [delegate managedObjectContext];
NSFetchRequest *request = [[NSFetchRequest alloc]init];
NSEntityDescription *entity = [NSEntityDescription entityForName:@"Sequence" inManagedObjectContext:context];
[request setEntity:entity];
NSError *error;
if(![context save:&error]){
    NSLog(@"Error fetching. %@ %@", error, [error localizedDescription]);
}
NSUInteger count = [context countForFetchRequest:request error:&error];
if(count != 0){
    NSArray *fetchObj = [context executeFetchRequest:request error:&error];
    NSManagedObject *sequence = (NSManagedObject *)[fetchObj objectAtIndex:0];
    NSLog(@"1 - %@", sequence);
    arrForWk1 = [sequence valueForKey:@"seqForWk1CD"];
    NSLog(@"%@", arrForWk1);
    arrForWk2 = [sequence valueForKey:@"seqForWk2CD"];
    NSLog(@"%@", arrForWk2);
}

当我重新启动应用程序时出现问题 . 数组要么显示（null）两个数组，要么显示两个数组的内容 . if(![context save:&error]) 的if语句永远不会被触发 . 已添加实体的NSManagedObject的子类 .

我也尝试在@interface中声明AppDelegate并强制通过执行 [delegate saveContext]; 来立即保存上下文 .

这是保存发生的方法 . “check”在viewDidLoad方法中初始化为0 . “arrForWk1”和“arrForWk2”都在@interface声明 .

- (IBAction)randomizeSequence:(UIButton *)sender { 
   NSMutableArray *storeArray = [[NSMutableArray alloc] init];
   AppDelegate *delegate = [[UIApplication sharedApplication]delegate];
   NSManagedObjectContext *context = [delegate managedObjectContext];
   SequenceMO *seqEntity = [NSEntityDescription insertNewObjectForEntityForName:@"Sequence" inManagedObjectContext:context];
   BOOL record = NO;
   int x;

   for (int i=0; [storeArray count] < 9; i++) //Loop for generate different random values
    {
       x = 1 + arc4random() % 9;//generating random number
       if(i==0)//for first time
       {
        [storeArray addObject:[NSNumber numberWithInt:x]];
       }
       else
       {
          for (int j=0; j<= [storeArray count]-1; j++)
          {
              if (x ==[[storeArray objectAtIndex:j] intValue])
                  record = YES;
          }

          if (record == YES)
          {
              record = NO;
          }
          else
          {
              [storeArray addObject:[NSNumber numberWithInt:x]];
          }
       }
    }
    check++;
    if(check == 1 ) {
       arrForWk1 = storeArray;
       [self.wk1Seq reloadData];
    }
    else if(check == 2) {
        arrForWk2 = storeArray;
        seqEntity.seqForWk1CD = arrForWk1;
        seqEntity.seqForWk2CD = arrForWk2;
        NSError *error = nil;
        if (context != nil) {
            if ([context hasChanges] && ![context save:&error]) {
                NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
                abort();
            }
        }

        [self.wk2Seq reloadData];
}

再加上，数组的数据类型为NSMutableArray，我试图将它们存储到“Transformable”类型的属性中 .