diff --git a/README.md b/README.md
index 8d89de2..db4bd28 100644
--- a/README.md
+++ b/README.md
@@ -208,6 +208,12 @@ Note That the default dialog box  implemented by DSBridge is modal. This will bl
 
 
 
+# WKUIDelegate
+
+In `DWKWebView ` , please use ` DSUIDelegate` instead of `UIDelegate` , because `UIDelegate` has already been set inner  `DWKWebView ` , `DSUIDelegate` is a proxy of `UIDelegate` .
+
+
+
 ## API Reference
 
 ### Object-C API
diff --git a/dsBridge.podspec b/dsBridge.podspec
index b903edf..2684972 100644
--- a/dsBridge.podspec
+++ b/dsBridge.podspec
@@ -16,7 +16,7 @@ Pod::Spec.new do |s|
   #
 
   s.name         = "dsBridge"
-  s.version      = "3.0.1"
+  s.version      = "3.0.2"
   s.summary      = "An ios bridge for calling functions synchronously and asynchronously between JavaScript and Object-C in WKWebView/UIWebView"
 
   # This description is used to generate tags and improve search results.
diff --git a/dsbridgedemo/ViewController.m b/dsbridgedemo/ViewController.m
index d2155f2..e6d9f3f 100644
--- a/dsbridgedemo/ViewController.m
+++ b/dsbridgedemo/ViewController.m
@@ -46,6 +46,7 @@ - (void)viewDidLoad {
     [dwebview callHandler:@"addValue" arguments:@[@3,@4] completionHandler:^(NSNumber * value){
         NSLog(@"%@",value);
     }];
+    
 
     [dwebview callHandler:@"append" arguments:@[@"I",@"love",@"you"] completionHandler:^(NSString * _Nullable value) {
        NSLog(@"call succeed, append string is: %@",value);
diff --git a/readme-chs.md b/readme-chs.md
index 2a43105..fc4b08a 100644
--- a/readme-chs.md
+++ b/readme-chs.md
@@ -186,6 +186,12 @@ DSBridge已经实现了 Javascript的弹出框函数(alert/confirm/prompt)，这
 
 
 
+# WKUIDelegate
+
+在 `DWKWebView ` 中，请使用` DSUIDelegate` 代替 `UIDelegate` , 因为在`DWKWebView ` 内部 `UIDelegate`已经设置过了，而 `DSUIDelegate` 正是  `UIDelegate` 的一个代理。
+
+
+
 ## API 列表
 
 ### Object-C API