         return img;
     }
     
-    // MARK: - --------------------手势事件--------------------
-    // MARK: 各种手势处理函数注释
-    
-    // MARK: - --------------------按钮事件--------------------
-    // MARK: 按钮点击函数注释
-    
-    // MARK: - --------------------代理方法--------------------
-
-    // MARK: Gesture Recognizer -
-    func paningGestureReceive(recoginzer: UIPanGestureRecognizer) {
-    
-        if (self.viewControllers.count <= 1 || !self.canDragBack) {
-            return;
-        }
-        
-        let touchPoint: CGPoint = recoginzer.locationInView(UIApplication.sharedApplication().keyWindow)
-        if (recoginzer.state == UIGestureRecognizerState.Began) {
-            self.view.userInteractionEnabled = false
-            self.isMoving = true
-            self.startTouch = touchPoint
-            self.addBackgroundMaskView()
-            
-        } else if (recoginzer.state == UIGestureRecognizerState.Ended) {
-            self.view.userInteractionEnabled = true
-            let velocityX: CGFloat = recoginzer.velocityInView(self.view).x
-            if (velocityX < 200) {
-                animateTime = 0.3;
-            } else {
-                animateTime = 0.2;
-            }
-            
-            if (touchPoint.x - startTouch!.x > self.view.frame.size.width/3) {
-                let x: CGFloat = self.view.frame.size.width
-                self.addShadowLayerIfNeed()
-                
-                
-                UIView.animateWithDuration(animateTime, animations: { () -> Void in
-                    self.moveViewWithX(x, isTransaction: false)
-
-                    }, completion: { (Bool) -> Void in
-                        var frame: CGRect = self.view.frame
-                        frame.origin.x = 0;
-                        self.view.frame = frame;
-                        
-                        self.dragAnimated = true;
-                        
-                        if (!self.shouldInvokeCTRootBackItem()) {
-                            self.popViewControllerAnimated(false)
-                            
-                        }
-                        
-                        self.dragAnimated = false;
-                        
-                        self.isMoving = false;
-                })
-                
-            } else {
-                self.restorePopAction()
-            }
-            return
-            
-        } else if (recoginzer.state == UIGestureRecognizerState.Cancelled) {
-            self.view.userInteractionEnabled = true;
-            self.restorePopAction()
-            return
-            
-        } else {
-            if (self.isMoving) {
-                if (touchPoint.x - startTouch!.x > (self.view.frame.size.width/6)) {
-                    if (self.shouldCancelDragAction()) {
-                        return
-                    }
-                }
-                
-                self.addShadowLayerIfNeed()
-                self.moveViewWithX(touchPoint.x - startTouch!.x, isTransaction: true)
-            }
-        }
-
-    }
-    
-
     func addBackgroundMaskView() {
         let frame: CGRect = self.view.bounds
         if (self.backgroundView == nil) {

        if (isTransaction) {
            CATransaction.commit()
        }

    }
    
    func shouldInvokeCTRootBackItem() -> Bool {

        }
    }
    
    func addShadowLayerIfNeed() {
        if ((self.backgroundView?.layer.sublayers?.contains(self.shadowLayer!)) != nil) {
            return
