如何反转集合视图单元格

debugcn 发表于 Dev

Satheeshkumar Naidu

我有一个包含15个元素的数组，我正在将它们添加到集合视图单元格中

_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;
}

我在下一个视图控制器中，我使用相机拍摄图像并将其保存到阵列中，然后使用以下方法将阵列传递回第一个视图控制器中 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];
}

我想在顶部添加新图像，但在底部

请帮助我，我对目标c还是陌生的

哈里·克里希南

检查我的答案@ sathees

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
 }

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