diff --git a/Example/MMCardView/SecondViewController.swift b/Example/MMCardView/SecondViewController.swift
index a47e87f..9f74bb0 100644
--- a/Example/MMCardView/SecondViewController.swift
+++ b/Example/MMCardView/SecondViewController.swift
@@ -8,11 +8,11 @@
 
 import UIKit
 
-protocol SecondViewProtocol {
+protocol SecondViewProtocol : class{
     func removeCard()
 }
 class SecondViewController: UIViewController {
-    var delegate:SecondViewProtocol?
+    weak var delegate:SecondViewProtocol?
     override func viewDidLoad() {
         super.viewDidLoad()
 
diff --git a/Example/MMCardView/ViewController.swift b/Example/MMCardView/ViewController.swift
index f9a9e94..25f6b82 100644
--- a/Example/MMCardView/ViewController.swift
+++ b/Example/MMCardView/ViewController.swift
@@ -48,12 +48,13 @@ class ViewController: UIViewController,CardCollectionViewDataSource {
                 let v = Int(arc4random_uniform(5))+1
                 c.imgV.image = UIImage.init(named: "image\(v)")            
             case let c as CardCCell:
-                c.clickCallBack {
+                c.clickCallBack{
+                    [unowned self] in
                     if let vc = UIStoryboard.init(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "Second") as? SecondViewController {
                         vc.delegate = self
                         self.card.presentViewController(to: vc)
                     }
-                }
+            }
             default:
                 return UICollectionViewCell()
 
diff --git a/MMCardView/Classes/CardCell.swift b/MMCardView/Classes/CardCell.swift
index 10ea42f..3419cfc 100644
--- a/MMCardView/Classes/CardCell.swift
+++ b/MMCardView/Classes/CardCell.swift
@@ -13,7 +13,7 @@ public protocol CardCellProtocol {
 }
 
 open class CardCell:UICollectionViewCell{
-    var collectionV:UICollectionView!
+    weak var collectionV:UICollectionView!
     var reloadBlock:(()->Void)?
     var customCardLayout:CardLayoutAttributes?
     var originTouchY:CGFloat = 0.0
diff --git a/MMCardView/Classes/CustomCardLayout.swift b/MMCardView/Classes/CustomCardLayout.swift
index a7a2d3a..95a7fc0 100644
--- a/MMCardView/Classes/CustomCardLayout.swift
+++ b/MMCardView/Classes/CustomCardLayout.swift
@@ -56,7 +56,8 @@ class CustomCardLayout: UICollectionViewLayout {
             self.collectionView?.performBatchUpdates({
                 self.collectionView?.reloadData()
             }, completion: nil)
-        } get {
+        }
+        get {
             return _selectIdx
         }
     }
@@ -141,6 +142,7 @@ class CustomCardLayout: UICollectionViewLayout {
                     attribute.frame = CGRect(x: currentFrame.origin.x, y: self.collectionView!.contentOffset.y, width: cellSize.width, height: cellSize.height)
                 } else if index < shitIdx-2 {
                     attribute.isHidden = true
+                    attribute.frame = CGRect(x: currentFrame.origin.x, y: self.collectionView!.contentOffset.y, width: cellSize.width, height: cellSize.height)
                 }else {
                     attribute.frame = currentFrame
                 }
diff --git a/MMCardView/Classes/CustomFlipTransition.swift b/MMCardView/Classes/CustomFlipTransition.swift
index cd5fa4d..3b1c75a 100644
--- a/MMCardView/Classes/CustomFlipTransition.swift
+++ b/MMCardView/Classes/CustomFlipTransition.swift
@@ -15,14 +15,9 @@ enum TransitionMode: Int {
 public class CustomFlipTransition: NSObject,UIViewControllerAnimatedTransitioning {
     var duration = 0.3
     var transitionMode:TransitionMode = .Present
-    var cardView:UICollectionViewCell!
+    weak var cardView:UICollectionViewCell!
+    weak var blurEffectView:UIVisualEffectView!
     var originalCardFrame = CGRect.zero
-    lazy var blurView:UIVisualEffectView = {
-        let blurEffect = UIBlurEffect(style: UIBlurEffectStyle.dark)
-        let blurEffectView = UIVisualEffectView(effect: blurEffect)
-        blurEffectView.alpha = 0.0
-        return blurEffectView
-    }()
     
     public func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
         return duration
@@ -41,15 +36,20 @@ public class CustomFlipTransition: NSObject,UIViewControllerAnimatedTransitionin
             toView?.frame = self.cardView.bounds
             toView?.layer.cornerRadius = viewRadius
             self.cardView.addSubview(toView!)
-            self.blurView.frame = containerView.bounds
-            self.blurView.alpha = 0.0
-            containerView.addSubview(self.blurView)
+            
+            let blurEffect = UIBlurEffect(style: UIBlurEffectStyle.dark)
+            let blurView = UIVisualEffectView(effect: blurEffect)
+            self.blurEffectView = blurView;
+            
+            blurView.frame = containerView.bounds
+            blurView.alpha = 0.0
+            containerView.addSubview(blurView)
 
             UIView.transition(with: self.cardView, duration: 0.7, options: [.transitionFlipFromRight,.curveEaseIn], animations: {
                 self.cardView.frame = CGRect.init(x: self.originalCardFrame.origin.x, y: self.originalCardFrame.origin.y, width: toViewF.width, height: toViewF.height)
                 }, completion: { (finish) in
                     UIView.animate(withDuration: 0.2, animations: {
-                        self.blurView.alpha = 1.0
+                        blurView.alpha = 1.0
                     })
                     
                     toView?.frame = toViewF
@@ -68,10 +68,10 @@ public class CustomFlipTransition: NSObject,UIViewControllerAnimatedTransitionin
                 fromView?.frame = CGRect.init(x: fromView!.frame.origin.x, y: fromView!.frame.origin.y, width: self.originalCardFrame.width, height: self.originalCardFrame.height)
                 content.frame = CGRect.init(x: fromView!.frame.origin.x, y: fromView!.frame.origin.y, width: self.originalCardFrame.width, height: self.originalCardFrame.height)
                 self.cardView.frame = CGRect.init(x: 0, y: self.originalCardFrame.origin.y, width: self.originalCardFrame.width, height: self.originalCardFrame.height)
-                self.blurView.alpha = 0.0
+                self.blurEffectView.alpha = 0.0
 
                 }, completion: { (finish) in
-                    self.blurView.removeFromSuperview()
+                    self.blurEffectView.removeFromSuperview()
                     content.backgroundColor = originalCrolor
                     content.removeFromSuperview()
                     self.cardView.addSubview(content)