 }
 
 fileprivate class _AssetCollectionViewController: UICollectionViewController {
+    private var _backgroundFilterView: UIView = UIView()
     var _photoAssetCollection: PHAssetCollection!
     var _photoAssets: PHFetchResult<PHAsset>!
     

    }
    
    private func _initializer() {
        
    }
    
    // Life cycle.

    
    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        
        _backgroundFilterView.frame = CGRect(x: 0.0, y: min(0.0, collectionView!.contentOffset.y), width: tabNavigationController?.tabNavigationBar.bounds.width ?? 0.0, height: tabNavigationController?.tabNavigationBar.bounds.height ?? 0.0)
    }
}

