集合视图单元格未出现

我想显示尽可能多的collectionViewCells with buttons因为我的数组中有字符串。但是当我启动模拟器时，只有背景CollectionView但没有显示单元格。可能是什么错误？

这是我的代码CollectionViewController我附加到CollectionView在 main.storyboard 中：

class CollectionViewController: UICollectionViewController {

var Array = [String]()

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    Array = ["1","2","3","4","5"]
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

func collectionView(collectionView: UICollectionView, numberOfItemsSection section: Int) -> Int {
    return Array.count
}

override func
    collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {

        var cell = collectionView.dequeueReusableCellWithReuseIdentifier("cell", forIndexPath: indexPath) as! UICollectionViewCell

        var button = cell.viewWithTag(1) as! UIButton
        button.titleLabel?.text = Array[indexPath.row]

        return cell
}

}

这些是集合视图控制器的连接：

故事板上的视图控制器：

您是否设置了CollectionViewController到故事板身份检查员？ :)

我会尝试打电话给reloadData()更改数据后viewDidLoad method.

希望有帮助