diff --git a/iOS/IMUIInputView/Controllers/IMUIInputView.swift b/iOS/IMUIInputView/Controllers/IMUIInputView.swift
index 5f89373f..b2a011cf 100644
--- a/iOS/IMUIInputView/Controllers/IMUIInputView.swift
+++ b/iOS/IMUIInputView/Controllers/IMUIInputView.swift
@@ -464,6 +464,7 @@ extension IMUIInputView: IMUICustomInputViewDelegate {
   
   public func keyBoardWillShow(height: CGFloat, durationTime: Double) {
     self.currentType = .empty
+    self.delegate?.keyBoardWillShow?(height: height, durationTime: durationTime)
     self.reloadFeaturnView()
   }
 }
diff --git a/iOS/IMUIMessageCollectionView/Views/IMUIMessageCollectionView.swift b/iOS/IMUIMessageCollectionView/Views/IMUIMessageCollectionView.swift
index 355372ab..468bf0fd 100644
--- a/iOS/IMUIMessageCollectionView/Views/IMUIMessageCollectionView.swift
+++ b/iOS/IMUIMessageCollectionView/Views/IMUIMessageCollectionView.swift
@@ -90,7 +90,10 @@ open class IMUIMessageCollectionView: UIView {
   @objc open func scrollToBottom(with animated: Bool) {
     if chatDataManager.count == 0 { return }
     let endIndex = IndexPath(item: chatDataManager.endIndex - 1, section: 0)
-    self.messageCollectionView.scrollToItem(at: endIndex, at: .bottom, animated: animated)
+    DispatchQueue.main.async {
+      self.messageCollectionView.scrollToItem(at: endIndex, at: .bottom, animated: animated)
+    }
+
   }
   
   @objc open func appendMessage(with message: IMUIMessageProtocol) {
diff --git a/iOS/sample/sample/ViewController.swift b/iOS/sample/sample/ViewController.swift
index 53919427..662b4f15 100644
--- a/iOS/sample/sample/ViewController.swift
+++ b/iOS/sample/sample/ViewController.swift
@@ -42,6 +42,7 @@ class ViewController: UIViewController {
   override func viewDidLoad() {
     super.viewDidLoad()
     self.myInputView.delegate = self
+//    self.myInputView.inputViewDelegate = self 
     self.messageCollectionView.delegate = self
     
     self.messageCollectionView.messageCollectionView.register(MessageEventCollectionViewCell.self, forCellWithReuseIdentifier: MessageEventCollectionViewCell.self.description())
@@ -61,6 +62,10 @@ class ViewController: UIViewController {
 // MARK: - IMUIInputViewDelegate
 extension ViewController: IMUIInputViewDelegate {
   
+  func keyBoardWillShow(height: CGFloat, durationTime: Double) {
+    self.messageCollectionView.scrollToBottom(with: true)
+  }
+  
   func sendTextMessage(_ messageText: String) {
     let outGoingmessage = MyMessageModel(text: messageText, isOutGoing: true)
     let inCommingMessage = MyMessageModel(text: messageText, isOutGoing: false)
@@ -215,3 +220,4 @@ extension ViewController: IMUIMessageMessageCollectionViewDelegate {
     toast.dismiss(withClickedButtonIndex: 0, animated: true)
   }
 }
+
diff --git a/iOS/sampleObjectC/sampleObjectC/ViewController.m b/iOS/sampleObjectC/sampleObjectC/ViewController.m
index 097a4cb9..63627ab9 100644
--- a/iOS/sampleObjectC/sampleObjectC/ViewController.m
+++ b/iOS/sampleObjectC/sampleObjectC/ViewController.m
@@ -27,6 +27,7 @@ - (void)viewDidLoad {
   [super viewDidLoad];
   self.messageList.delegate = self;
   self.imuiInputView.delegate = self;
+  self.imuiInputView.inputViewDelegate = self;
   
   [self.messageList.messageCollectionView registerClass:[MessageEventCollectionViewCell class] forCellWithReuseIdentifier:[[MessageEventCollectionViewCell class] description]];
   
@@ -191,7 +192,7 @@ - (void)finishRecordVideoWithVideoPath:(NSString * _Nonnull)videoPath durationTi
 }
 
 - (void)keyBoardWillShowWithHeight:(CGFloat)height durationTime:(double)durationTime {
-  
+  [_messageList scrollToBottomWith: YES];
 }
 
 - (NSString *)getPath {//"\(NSHomeDirectory())/Documents/"