         return nil
     }
     
-    var displayKeyframeImages: [KeyframeImage] = []
+    fileprivate var displayKeyframeImages: [KeyframeImage] = []
 
     //MARK: - Life Cycle
     open override func viewDidLoad() {

    }
    
    //MARK: - Load Data
    func loadData() {
        if let _asset = _asset {
            imageGenerator.generateDefaultSequenceOfImages(from: _asset) { [weak self] in
                self?.displayKeyframeImages.append(contentsOf: $0)

    }
    
    //MARK: - UI Related
    open func configUI() {
        
    }
    
    open func updateUI() {
        collectionView.reloadData()
    }
    
