         if (isTransaction) {
             CATransaction.commit()
         }
-
+        
     }
     
     func shouldInvokeCTRootBackItem() -> Bool {

    func shouldCancelDragAction() -> Bool {
        return false
    }
    
    // MARK: - --------------------属性相关--------------------
    // MARK: 属性操作函数注释

        return img;
    }
    
    func addBackgroundMaskView() {
        let frame: CGRect = self.view.bounds
        if (self.backgroundView == nil) {
