add optional type for CYLTabBarControllerDelegate methods

ChenYilong · ChenYilong · commit fb65656d7811 · 2018-05-10T16:12:27.000+08:00
diff --git a/CYLTabBarController/CYLTabBarController.h b/CYLTabBarController/CYLTabBarController.h
@@ -24,7 +24,7 @@ FOUNDATION_EXTERN CGFloat CYLPlusButtonWidth;
 FOUNDATION_EXTERN CGFloat CYLTabBarItemWidth;
 
 @protocol CYLTabBarControllerDelegate <NSObject>
-
+@optional
 /*!
  * @param tabBarController The tab bar controller containing viewController.
  * @param control Selected UIControl in TabBar.
