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DB からのデータを取り込む UICollectionView があります。ユーザーはさまざまなセルを選択し、ボタンを押して情報を保存します。投稿するデータを取得できません。私は何を間違っていますか？




#pragma mark <UICollectionViewDataSource>



- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {

    NSLog(@"itemPresets --> %lu",(unsigned long)[self.itemPresets count]);

    return [self.itemPresets count];

}



- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {

    NSLog(@"itemPresets[section] --> %lu",(unsigned long)[self.itemPresets[section] count]);

    return  [self.itemPresets[section] count];

}



- (UICollectionReusableView*)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath

{

    UICollectionReusableView * view = nil;



    if ([kind isEqualToString:UICollectionElementKindSectionHeader])

    {

        ItemSectionHeaderView *header = [collectionView dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionHeader

                                                                           withReuseIdentifier:NSStringFromClass([ItemSectionHeaderView class])

                                                                                  forIndexPath:indexPath];

        header.captionLabel.text = self.headTitleArray[indexPath.section];

        view = header;

    }

    return view;

}





- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {

    UICollectionViewCell *cell;



    ItemCell *aCell = (ItemCell *)[collectionView dequeueReusableCellWithReuseIdentifier:@"itemCell" forIndexPath:indexPath];



    if (indexPath.section == 2) {

        aCell.label.backgroundColor = [Helper colorWithSetting:(self.itemPresets[indexPath.section][indexPath.row])];

        aCell.label.text = @"";

    }

    else

    {

        aCell.label.text = self.itemPresets[indexPath.section][indexPath.row];

        aCell.label.textAlignment = NSTextAlignmentCenter;

    }

    cell = aCell;



    cell.selectedBackgroundView.backgroundColor = [UIColor darkGrayColor];

    return cell;

}







- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath

{

    CGSize size;

    if (indexPath.section == 6)

    {

        size = CGSizeMake(140, 30);

    }

    else if (indexPath.section <= 5 && indexPath.section >= 0)

    {

        size = CGSizeMake(80, 30);

    }

    else

    {

        size = CGSizeMake(self.collectionView.frame.size.width, 150);

    }



    return size;

}



#pragma mark <UICollectionViewDelegate>



- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath

{

  NSArray * selectedRows = self.collectionView.indexPathsForSelectedItems;



  for (NSIndexPath * selectedRow in selectedRows) {

    if ((selectedRow.section == indexPath.section) && (selectedRow.row != indexPath.row)) {

      [self.collectionView deselectItemAtIndexPath:selectedRow animated:NO];

    }

  }

  switch (indexPath.section) {

    case 0:

      self.setting.itemKeyA = self.itemPresets[indexPath.section][indexPath.row];

      NSLog(@“ValueA in case -----> %@",self.itemPresets[indexPath.section][indexPath.row]);

      break;

    case 1:

      self.setting.itemKeyB = self.itemPresets[indexPath.section][indexPath.row];

      NSLog(@“ValueB in case -----> %@",self.itemPresets[indexPath.section][indexPath.row]);

      break;

    case 2:

        self.setting.itemKeyC = self.itemPresets[indexPath.section][indexPath.row];

      NSLog(@“ValueC in case -----> %@",self.itemPresets[indexPath.section][indexPath.row]);

      break;

    default:

      break;

  }



    NSLog(@“ValueA in set -----> %@",self.setting.itemKeyA);

    NSLog(@“ValueB in set -----> %@",self.setting.itemKeyB);

    NSLog(@“ValueC in set -----> %@",self.setting.itemKeyC);



}



# pragma mark - sync with Parse

- (void)register

{

    if (!self.setting.KeyA || !self.setting.KeyB || !self.setting.KeyC)

    {

        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@" Request Incomplete" message:@"Please select all the necessary fields." delegate:self cancelButtonTitle:NSLocalizedString(@"Ok", @"Ok") otherButtonTitles:nil, nil];

        [alert show];

        return;

    }



    PFObject *postActivity = [PFObject objectWithClassName:@"Activity"];

    [postActivity setObject:@“Apply" forKey:@“activityType"];

    [postActivity setObject:[PFUser currentUser] forKey:@"fromUser"]; // Set fromUser

    [postActivity saveInBackground];



    PFObject *post = [PFObject objectWithClassName:@“Apply"];

    [post setObject:[PFUser currentUser] forKey:@"User"]; // Set fromUser

    NSLog(@“keyA -----> %@",self.setting.KeyA);

    NSLog(@“keyB -----> %@“,self.setting.KeyB);

    NSLog(@“keyC -----> %@",self.setting.KeyC);

    [post setObject:self.setting.KeyA forKey:@“keyA"];

    [post setObject:self.setting.KeyB forKey:@“keyB"];

    [post setObject:self.setting.KeyC forKey:@“keyC"];



    self.HUD = [[MBProgressHUD alloc] initWithView:self.view];

    [self.view addSubview:self.HUD];



    // Set determinate mode

    self.HUD.mode = MBProgressHUDModeIndeterminate;

    self.HUD.delegate = self;

    self.HUD.labelText = @"Applying  ...";

    self.HUD.dimBackground = YES;

    [self.HUD show:YES];



    [post saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {

        if (succeeded) {

            [self.HUD hide:YES];



        [self performSegueWithIdentifier:@"unwindItemCollectionViewController" sender:self];

        }

    }];
}







The logs:



2015-10-15 14:12:10.530 x itemPresets --> 0
2015-10-15 14:12:10.530 x itemPresets --> 0
2015-10-15 14:12:10.674 x itemPresets --> 3
2015-10-15 14:12:10.674 x itemPresets[section] --> 9
2015-10-15 14:12:10.675 x itemPresets[section] --> 6
2015-10-15 14:12:10.675 x itemPresets[section] --> 10




not sure why I get 0 twice first, but the above NSLogs are correct



2015-10-15 14:12:11.434 x ValueA in case -----> Correct / Selected value
2015-10-15 14:12:11.435 x ValueA in set -----> (null)
2015-10-15 14:12:11.435 x ValueB in set -----> (null)
2015-10-15 14:12:11.436 x ValueC in set -----> (null)
2015-10-15 14:12:12.217 x ValueB in case-----> Correct / Selected value
2015-10-15 14:12:12.217 x ValueA in set -----> (null)
2015-10-15 14:12:12.218 x ValueB in set -----> (null)
2015-10-15 14:12:12.218 x ValueC in set -----> (null)
2015-10-15 14:12:14.516 x ValueC in case-----> Correct / Selected value
2015-10-15 14:12:14.517 x ValueA in set -----> (null)
2015-10-15 14:12:14.517 x ValueB in set -----> (null)
2015-10-15 14:12:14.518 x ValueC in set -----> (null)




As you can see from the NSLogs above, the value is getting selected initially and logs correctly but it is not retained (tho it stays highlighted) so that when the user presses the button and calls the register method the values are all null. The information the user has provided can not be saves. The app triggers an alert (or crashes is the check for nil is removed).  PostActivity is working and saves as expected to database, but Post for the class Apply breaks.



I've tried a variety of fixes.  Errors I get (again when check is commected out) include:


int main(int argc, char * argv[]) {
  @autoreleasepool {
      return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate      class]));
  }
}

*** キャッチされない例外 'NSInvalidArgumentException' が原因でアプリを終了します。理由: 'PFObject のキーまたは値に nil を使用できません。値には NSNull を使用してください。

UICollectionView データソース メソッドが呼び出されないことを試しまし たが、init で設定されています

また、itemCell や itemKeyA などのプロパティを strong または keep (および非アトミック) に変更しました。

UIOutlet/ストーリーボードを再接続してみました

これは nib / xib の問題ですか? それが正しく設定されていることを確認する方法を十分に理解していないことを認めます。

ありがとう

4

1 に答える 1

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キーに値を割り当てると、 のインスタンスに関連付けられますPFObject。あなたの値が である場合がありますnil。Parse では、キーに関連付けられた値をゼロにしようとしていると考えられます。nilただし、誤って値を割り当てていると思います。だから、あなたがやろうとしていることを理解しようとしているだけです。値を割り当てる前に、 を使用if-elseして、それがそうであるかどうかを確認できますnil。

于 2015-10-15T23:20:16.997 に答える