Update WXDefine.h (#3012)

diff --git a/ios/sdk/WeexSDK/Sources/Utility/WXDefine.h b/ios/sdk/WeexSDK/Sources/Utility/WXDefine.h
index a9b9dcf..c687ab0 100644
--- a/ios/sdk/WeexSDK/Sources/Utility/WXDefine.h
+++ b/ios/sdk/WeexSDK/Sources/Utility/WXDefine.h
@@ -20,7 +20,7 @@
 #ifndef __WX_DEFINE_H__
 #define __WX_DEFINE_H__
 
-#define WX_SDK_VERSION @"0.24.0"
+#define WX_SDK_VERSION @"0.28.0"
 
 #if defined(__cplusplus)
 #define WX_EXTERN extern "C" __attribute__((visibility("default")))