如何在scrollview中放置PFQueryCollectionView？

Question

我正在尝试在滚动视图中放置一个PFQueryCollectionView，但它一直在崩溃时出现此错误[UICollectionViewController loadView] instantiated view controller with identifier "first" from storyboard "Main", but didn't get a UICollectionView.'单元格标识符以及storyboard id是正确的。我想我知道出了什么问题。它试图将视图控制器放在滚动视图中，而是检索PFQueryCollectionView类。

滚动视图

 override func viewDidLoad() {
    super.viewDidLoad()

    let page: pageone = self.storyboard?.instantiateViewControllerWithIdentifier("first") as! pageone

收藏视图

class pageone: PFQueryCollectionViewController{

override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath, object: PFObject?) -> PFCollectionViewCell? {
    var cell: PFCell = collectionview.dequeueReusableCellWithReuseIdentifier("cell", forIndexPath: indexPath) as! PFCell
    cell.name.text = object!["Name"] as? String
    return cell
}


}