Как реверс ячейки просмотра коллекции

Question

У меня есть массив из 15 элементов, и я добавляю их в коллекцию вида клетку

_imagearray=[@[@"bootimages",@"fall-photography-in-hocking-hills", @"gift",@"hillimages",@"Mercedes-classe-S-W116_large_dettaglio_articolo",@"prinimages",@"resplendent",@"tnb4",@"Tomato-plant",@"Vole",@"waterimages",@"fall-photography-in-hocking-hills", @"gift",@"hillimages",@"Mercedes-classe-S-W116_large_dettaglio_articolo"]mutableCopy]; 

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

    //[self.collection reloadData]; 
    homeceeCollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:reuseIdentifier forIndexPath:indexPath]; 

    UIImage *image; 
    NSInteger row = [indexPath row]; 


    NSLog(@"indexpath = %ld", (long)row); 

     image = [UIImage imageNamed:_imagearray[row]]; 

    cell.img.image = image; 

    cell.text.text=[_tittlearray objectAtIndex:indexPath.row]; 

     return cell; 
} 

и я в следующем контроллере представления я беру изображение с помощью камеры и сохранения в в массив и я передаю массив обратно в первый контроллер представления с использованием NSNotificationCenter

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(receivedArray:) name:@"ShareArray" object:nil]; 

-(void) receivedArray:(NSNotification*)notification 
{ 

     NSMutableArray* userInfo = notification.object; 
    UIImage *image = [userInfo firstObject]; 

     [_imagearray addObject:[userInfo firstObject]]; 

    NSLog(@"%@",_imagearray); 
     [self.collection reloadData]; 
    _collection.delegate=self; 
    _collection.dataSource=self; 


    NSLog(@"%@",_imagearray); 
} 
I am Reloading the collection view cell and the new image doesn't have name 
if (indexPath.row == 15) { 
     image= _imagearray[row]; 

       //[_imagearray insertObject:image atIndex:0]; 

    }else { 
     image = [UIImage imageNamed:_imagearray[row]]; 


    } 
    cell.img.image = image; 

    cell.text.text=[_tittlearray objectAtIndex:indexPath.row]; 
} 

Я хочу, чтобы добавить новое изображение на вершине, но он находится в нижней

, пожалуйста, помогите мне я новичок в Objective C

Answer 1

Проверьте мой ответ @ satheesKumar Найду

imagearray=[@[@"bootimages",@"fall-photography-in-hocking-hills", @"gift",@"hillimages",@"Mercedes-classe-S-W116_large_dettaglio_articolo",@"prinimages",@"resplendent",@"tnb4",@"Tomato-plant",@"Vole",@"waterimages",@"fall-photography-in-hocking-hills", @"gift",@"hillimages",@"Mercedes-classe-S-W116_large_dettaglio_articolo"]mutableCopy]; 

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

    //[self.collection reloadData]; 
    homeceeCollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:reuseIdentifier forIndexPath:indexPath]; 

    UIImage *image; 
    NSInteger row = [indexPath row]; 


    NSLog(@"indexpath = %ld", (long)row); 
    // here i have make the changes** 
    if([_imagearray[row] isKindOfClass:[UIImage class]]){ 
     image = _imagearray[row] 
    } 
    else { 
     image = [UIImage imageNamed:_imagearray[row]]; 
    } 

    cell.img.image = image; 

    cell.text.text=[_tittlearray objectAtIndex:indexPath.row]; 

     return cell; 
} 


-(void) receivedArray:(NSNotification*)notification { 

    NSMutableArray* userInfo = notification.object; 
    if([userInfo count]>0) { 
    UIImage *image = [userInfo firstObject]; 
    ///[_imagearray addObject:[userInfo firstObject]]; use this it will diretly add to end of the last index 
    [_imagearray insertObject:[userInfo firstObject] atIndex:0]; // it will add to firstindex of the array value 
    NSLog(@"%@",_imagearray); 
    [self.collection reloadData]; 
    // here do not want add the delegate itself. 
    NSLog(@"%@",_imagearray); 
    } // it will check the nil object and to prevent the crash 
} 

Answer 2

 -(void) receivedArray:(NSNotification*)notification { 

      NSMutableArray* userInfo = notification.object; 
     UIImage *image = [userInfo firstObject]; 

      //[_imagearray addObject:[userInfo firstObject]]; 
     if(image){ 
     [_imagearray insertObject:image atIndex:0]; // it will insert element at 0 index and will show first place in collection view 

     NSLog(@"%@",_imagearray); 
      [self.collection reloadData]; 
     _collection.delegate=self; 
     _collection.dataSource=self; 


     NSLog(@"%@",_imagearray); 
     } 
}