fix(extend-ios-with-swift): #55 add @objc attr
diff --git a/docs/guide/extend/extend-ios-with-swift.md b/docs/guide/extend/extend-ios-with-swift.md
index 1671a40..de0e277 100644
--- a/docs/guide/extend/extend-ios-with-swift.md
+++ b/docs/guide/extend/extend-ios-with-swift.md
@@ -54,17 +54,22 @@
 
   - WXSwiftTestModule.swift
     
-    ```
+    ```swift
         import Foundation
         public extension WXSwiftTestModule {
-           public func printSome(someThing:String, callback:WXModuleCallback) {
-               print(someThing)
-               callback(someThing)
-           }
+          @objc(printSome:callback:)
+          public func printSome(someThing:String, callback:WXModuleCallback) {
+            print(someThing)
+            callback(someThing)
+          }
         }
     ```
     
-  we need to expose `WXSwiftTestModule` `WXModuleCallback` in `WeexDemo-Bridging-Header` as our `Objective-C` need to access them
+  we need to expose `WXSwiftTestModule` `WXModuleCallback` in `WeexDemo-Bridging-Header` as our `Objective-C` need to access them.
+
+  Attention: Please add the `@objc` attribute to the method in the Swift file to avoid the error for the method cannot be found.
+
+
 
   - WeexDemo-Bridging-Header.h
     
diff --git a/docs/zh/guide/extend/extend-ios-with-swift.md b/docs/zh/guide/extend/extend-ios-with-swift.md
index f4ebeb4..2ac0db3 100644
--- a/docs/zh/guide/extend/extend-ios-with-swift.md
+++ b/docs/zh/guide/extend/extend-ios-with-swift.md
@@ -51,17 +51,21 @@
   扩展 OC 的类 `WXSwiftTestModule`,增加了一个方法,这个方法就是我们要暴露出来,在 js 中可以调到的
   - WXSwiftTestModule.swift
     
-    ```
+    ```swift
         import Foundation
         public extension WXSwiftTestModule {
-           public func printSome(someThing:String, callback:WXModuleCallback) {
-               print(someThing)
-               callback(someThing)
-           }
+          @objc(printSome:callback:)
+          public func printSome(someThing:String, callback:WXModuleCallback) {
+            print(someThing)
+            callback(someThing)
+          }
         }
     ```
     
-    `WXSwiftTestModule` 和`WXModuleCallback` 因为是 OC 的,需要在 `WeexDemo-Bridging-Header` 中暴露
+    `WXSwiftTestModule` 和`WXModuleCallback` 因为是 OC 的,需要在 `WeexDemo-Bridging-Header` 中暴露。
+
+    注意:请在 Swift 文件中为方法添加 `@objc` 修饰符,避免找不到方法的报错。
+
   - WeexDemo-Bridging-Header.h中
     
     ```