diff --git a/docs/iOS/IMUIInputView_usage.md b/docs/iOS/IMUIInputView_usage.md
index d26d0ca1..1532398b 100644
--- a/docs/iOS/IMUIInputView_usage.md
+++ b/docs/iOS/IMUIInputView_usage.md
@@ -93,14 +93,14 @@ from [0.10.0 Version] you can use ```IMUICustomInputView ``` to customize you in
 
 - return left/right/bottom inputBarItemListView's item number
 
-  ```
+  ```swift
   func imuiInputView(_ inputBarItemListView: UICollectionView,
                              numberForItemAt position: IMUIInputViewItemPosition) -> Int
   ```
 
 - retuen left/right/bottom inputBarItemListView's item size
 
-  ```
+  ```swift
   func imuiInputView(_ inputBarItemListView: UICollectionView,
                              _ position: IMUIInputViewItemPosition,
                              sizeForIndex indexPath: IndexPath) -> CGSize
@@ -108,7 +108,7 @@ from [0.10.0 Version] you can use ```IMUICustomInputView ``` to customize you in
 
 - return left/right/bottom inputBarItemListView's item cell
 
-  ```
+  ```swift
   func imuiInputView(_ inputBarItemListView: UICollectionView,
                              _ position: IMUIInputViewItemPosition,
                              cellForItemAt indexPath: IndexPath) -> UICollectionViewCell
@@ -116,7 +116,7 @@ from [0.10.0 Version] you can use ```IMUICustomInputView ``` to customize you in
 
 - return featureView's cell
 
-  ```
+  ```swift
   func imuiInputView(_ featureView: UICollectionView,
                              cellForItem indexPath: IndexPath) -> UICollectionViewCell
   ```
@@ -125,13 +125,13 @@ from [0.10.0 Version] you can use ```IMUICustomInputView ``` to customize you in
 
 - Tells the delegate when inputTextview text did change
 
-  ```
+  ```swift
   optional func textDidChange(text: String)
   ```
 
 - Tells the delegate when keyboard will show
 
-  ```
+  ```swift
   optional func keyBoardWillShow(height: CGFloat, durationTime: Double)
   ```
 
@@ -141,7 +141,7 @@ from [0.10.0 Version] you can use ```IMUICustomInputView ``` to customize you in
 
 - register ```UICollectionViewCell``` to specified position, The usage just like ```UICollectionView```. there are two register function:
 
-```
+```swift
 // register cell with class
 public func register(_ cellClass: AnyClass?, in position: IMUIInputViewItemPosition, forCellWithReuseIdentifier identifier: String) {  }
 
@@ -151,7 +151,7 @@ public func register(_ nib: UINib?,in position: IMUIInputViewItemPosition, forCe
 
 example:
 
-```
+```swift
   customIntputView.self.register(
           UINib(nibName: "IMUIFeatureListIconCell", bundle: bundle), 
           in: .bottom, 
@@ -175,7 +175,7 @@ example:
 
 - featureView also need to register ```UICollectionViewCell ``` to featureView, there are two register function:
 
-  ```
+  ```swift
   // register cell with class
   public func registerForFeatureView(_ cellClass: AnyClass?, 
            forCellWithReuseIdentifier identifier: String) {  }
@@ -187,7 +187,7 @@ example:
 
   example:
 
-  ```
+  ```swift
   customInputView.registerForFeatureView(
   		UINib(nibName: "IMUIRecordVoiceCell", bundle: bundle),
            forCellWithReuseIdentifier: "IMUIRecordVoiceCell"
@@ -206,7 +206,7 @@ example:
 
 Sometime you need to update inputView's item(ex: if textView's text is empty, you want to set send button's color to gray that mean the button is unable to click), You can use the following methods：
 
-```
+```swift
 //update inputBar's item
 public func updateInputBarItemCell(_ position: IMUIInputViewItemPosition,
                                      at index: Int)
@@ -217,13 +217,13 @@ public func reloadFeaturnView()
 
 ##### show featureView
 
-```
+```swift
 customInputView.showFeatureView()
 ```
 
 ##### hidden featureView
 
-```
+```swift
 customInputView.hideFeatureView()
 ```