diff --git a/FayeClient/FayeClient.swift b/FayeClient/FayeClient.swift
index c8f9e8366..8c6b03bc3 100644
--- a/FayeClient/FayeClient.swift
+++ b/FayeClient/FayeClient.swift
@@ -29,7 +29,7 @@ public typealias FayeClientPrivateHandler = (message: FayeMessage) -> Void
 public class FayeClient: NSObject {
 
     public private(set) var webSocket: SRWebSocket?
-    public private(set)var serverURL: NSURL!
+    public private(set) var serverURL: NSURL!
     public private(set) var clientID: String!
 
     public private(set) var sentMessageCount: Int = 0
diff --git a/Yep/Services/YepFayeService.swift b/Yep/Services/YepFayeService.swift
index 0c18981fb..07c9b6a56 100644
--- a/Yep/Services/YepFayeService.swift
+++ b/Yep/Services/YepFayeService.swift
@@ -108,7 +108,7 @@ extension YepFayeService {
                 return
             }
 
-            self?.fayeClient.subscribeToChannel(personalChannel) { data in
+            self?.fayeClient.subscribeToChannel(personalChannel) { [weak self] data in
 
                 println("receive faye data: \(data)")
 
diff --git a/Yep/ViewControllers/Conversation/ConversationViewController.swift b/Yep/ViewControllers/Conversation/ConversationViewController.swift
index cd8ac08b2..76795a6be 100644
--- a/Yep/ViewControllers/Conversation/ConversationViewController.swift
+++ b/Yep/ViewControllers/Conversation/ConversationViewController.swift
@@ -1510,24 +1510,24 @@ final class ConversationViewController: BaseViewController {
 
         let newMessagesCount = Int(messages.count - _lastTimeMessagesCount)
 
-        let lastDisplayedMessagesRange = displayedMessagesRange
-
-        displayedMessagesRange.length += newMessagesCount
-
-        let needReloadLoadPreviousSection = self.needReloadLoadPreviousSection
-
         // 异常：两种计数不相等，治标：reload，避免插入
         if let messageIDs = messageIDs {
             if newMessagesCount != messageIDs.count {
                 reloadConversationCollectionView()
                 println("newMessagesCount != messageIDs.count")
                 #if DEBUG
-                    YepAlert.alertSorry(message: "请截屏报告!\nnewMessagesCount: \(newMessagesCount)\nmessageIDs.count: \(messageIDs.count): \(messageIDs)", inViewController: self)
+                    YepAlert.alertSorry(message: "请截屏报告!\nnewMessagesCount: \(newMessagesCount)\nmessageIDs.count: \(messageIDs.count)", inViewController: self)
                 #endif
                 return
             }
         }
 
+        let lastDisplayedMessagesRange = displayedMessagesRange
+
+        displayedMessagesRange.length += newMessagesCount
+
+        let needReloadLoadPreviousSection = self.needReloadLoadPreviousSection
+
         if newMessagesCount > 0 {
 
             if let messageIDs = messageIDs {
@@ -1538,10 +1538,10 @@ final class ConversationViewController: BaseViewController {
                     if let
                         message = messageWithMessageID(messageID, inRealm: realm),
                         index = messages.indexOf(message) {
-                            let indexPath = NSIndexPath(forItem: index - displayedMessagesRange.location, inSection: Section.Message.rawValue)
-                            //println("insert item: \(indexPath.item), \(index), \(displayedMessagesRange.location)")
+                        let indexPath = NSIndexPath(forItem: index - displayedMessagesRange.location, inSection: Section.Message.rawValue)
+                        //println("insert item: \(indexPath.item), \(index), \(displayedMessagesRange.location)")
 
-                            indexPaths.append(indexPath)
+                        indexPaths.append(indexPath)
 
                     } else {
                         println("unknown message")
@@ -1566,8 +1566,7 @@ final class ConversationViewController: BaseViewController {
 
                         self?.conversationCollectionView.insertItemsAtIndexPaths(indexPaths)
 
-                    }, completion: { _ in
-                    })
+                    }, completion: nil)
 
                 case .Old:
                     // 用 CATransaction 保证 CollectionView 在插入后不闪动
@@ -1596,11 +1595,9 @@ final class ConversationViewController: BaseViewController {
                     })
                 }
 
-                println("insert messages A")
+                println("insert other messages")
 
             } else {
-                println("self message")
-
                 // 这里做了一个假设：本地刚创建的消息比所有的已有的消息都要新，这在创建消息里做保证（服务器可能传回创建在“未来”的消息）
 
                 var indexPaths = [NSIndexPath]()
@@ -1618,10 +1615,9 @@ final class ConversationViewController: BaseViewController {
 
                     self?.conversationCollectionView.insertItemsAtIndexPaths(indexPaths)
 
-                }, completion: { _ in
-                })
+                }, completion: nil)
 
-                println("insert messages B")
+                println("insert self messages")
             }
         }
 
diff --git a/Yep/ViewControllers/PickPhotos/ImageCacheController.swift b/Yep/ViewControllers/PickPhotos/ImageCacheController.swift
index 3f333aea3..98c15db2e 100644
--- a/Yep/ViewControllers/PickPhotos/ImageCacheController.swift
+++ b/Yep/ViewControllers/PickPhotos/ImageCacheController.swift
@@ -12,9 +12,9 @@ import Photos
 final class ImageCacheController {
 
     private var cachedIndices = NSIndexSet()
-    var cachePreheatSize: Int
-    var imageCache: PHCachingImageManager
-    var images: PHFetchResult
+    let cachePreheatSize: Int
+    let imageCache: PHCachingImageManager
+    let images: PHFetchResult
     var targetSize = CGSize(width: 80, height: 80)
     var contentMode = PHImageContentMode.AspectFill
 
diff --git a/Yep/Views/Cells/QuickPickPhotos/QuickPickPhotosCell.swift b/Yep/Views/Cells/QuickPickPhotos/QuickPickPhotosCell.swift
index 261c1224a..7bbe4a4d6 100644
--- a/Yep/Views/Cells/QuickPickPhotos/QuickPickPhotosCell.swift
+++ b/Yep/Views/Cells/QuickPickPhotos/QuickPickPhotosCell.swift
@@ -20,7 +20,7 @@ final class QuickPickPhotosCell: UITableViewCell {
     var pickedPhotosAction: (Set<PHAsset> -> Void)?
 
     var images: PHFetchResult?
-    let imageManager = PHCachingImageManager()
+    lazy var imageManager = PHCachingImageManager()
     var imageCacheController: ImageCacheController!
 
     var pickedImageSet = Set<PHAsset>() {
@@ -40,8 +40,6 @@ final class QuickPickPhotosCell: UITableViewCell {
         photosCollectionView.registerNibOf(CameraCell)
         photosCollectionView.registerNibOf(PhotoCell)
 
-        photosCollectionView.dataSource = self
-        photosCollectionView.delegate = self
         photosCollectionView.showsHorizontalScrollIndicator = false
 
         if let layout = photosCollectionView.collectionViewLayout as? UICollectionViewFlowLayout {
@@ -63,6 +61,9 @@ final class QuickPickPhotosCell: UITableViewCell {
                     strongSelf.images = images
                     strongSelf.imageCacheController = ImageCacheController(imageManager: strongSelf.imageManager, images: images, preheatSize: 1)
 
+                    strongSelf.photosCollectionView.dataSource = self
+                    strongSelf.photosCollectionView.delegate = self
+
                     strongSelf.photosCollectionView.reloadData()
 
                     PHPhotoLibrary.sharedPhotoLibrary().registerChangeObserver(strongSelf)