下記のようにコードを書いたのですが、CollectionViewのセルに画像が表示されません。コードのどこが間違っているのでしょうか?ちなみにStoryboardのセルのidentifierdequeueReusableCellWithReuseIdentifierは一致しています。どなたか分かる方、教えていただきたいです。すみませんが、よろしくお願いします。

ViewController.h

@interface ViewController : UIViewController

@property (weak, nonatomic) IBOutlet UICollectionView *collectionView;

@end

ViewController.m

@interface ViewController () {
    NSArray *datas;
}

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    datas = @[[UIImage imageNamed:@"image1.png"], [UIImage imageNamed:@"image2.png"], [UIImage imageNamed:@"image3.png"]];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{
    return 1;
}

- (NSInteger)collectionView:(UICollectionView *)collectionView
     numberOfItemsInSection:(NSInteger)section
{
    return datas.count;
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView
                  cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    UICollectionViewCell *cell = [self.collectionView dequeueReusableCellWithReuseIdentifier:@"Cell"
                                                                                forIndexPath:indexPath];
    UIImageView *imageView = (UIImageView *)[cell.contentView viewWithTag: 1];
    imageView.image = datas[indexPath.row];

    return cell;
}

@end