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我有一个导航控制器推送到集合视图控制器。这个collectionView 有一个NSArray图像，我确信collectionView 中有一些元素使用了visibleCells 方法。但是当我启动它时，没有显示单元格。这是我的代码：

- (void)viewDidLoad
{
    [super viewDidLoad];
images = [NSArray arrayWithObjects:@"angry_birds_cake.jpg", @"creme_brelee.jpg", @"egg_benedict.jpg", @"full_breakfast.jpg", @"green_tea.jpg", @"ham_and_cheese_panini.jpg", @"ham_and_egg_sandwich.jpg", @"hamburger.jpg", @"instant_noodle_with_egg.jpg", @"japanese_noodle_with_pork.jpg", @"mushroom_risotto.jpg", @"noodle_with_bbq_pork.jpg", @"starbucks_coffee.jpg", @"thai_shrimp_cake.jpg", @"vegetable_curry.jpg", @"white_chocolate_donut.jpg", nil];
} 

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

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
static NSString *identifier = @"Cell";

UICollectionViewCell *cell;
[collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"Cell"];
cell = [collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath];


NSArray *tab = [collectionView visibleCells];
for (int i = 0; i < [tab count]; ++i)
{
    NSLog(@"%d", i);
}
[collectionView setBackgroundColor:[UIColor blueColor]];

UIImageView *imageView = (UIImageView *)[cell viewWithTag:100];
imageView.image = [UIImage imageNamed:[images objectAtIndex:indexPath.row]];


return cell;
}

我哪里错了？非常感谢。

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