diff --git a/NJKScrollFullScreen/UIViewController+NJKFullScreenSupport.m b/NJKScrollFullScreen/UIViewController+NJKFullScreenSupport.m
index b685320..63fafe4 100644
--- a/NJKScrollFullScreen/UIViewController+NJKFullScreenSupport.m
+++ b/NJKScrollFullScreen/UIViewController+NJKFullScreenSupport.m
@@ -138,7 +138,8 @@ - (void)setToolbarOriginY:(CGFloat)y animated:(BOOL)animated
 
 - (void)showTabBar:(BOOL)animated
 {
-    CGFloat viewHeight = self.tabBarController.view.frame.size.height;
+    CGSize viewSize = self.tabBarController.view.frame.size;
+    CGFloat viewHeight = UIInterfaceOrientationIsPortrait(self.interfaceOrientation) ? viewSize.height : viewSize.width;
     CGFloat toolbarHeight = self.tabBarController.tabBar.frame.size.height;
     [self setTabBarOriginY:viewHeight - toolbarHeight animated:animated];
 }
@@ -163,7 +164,6 @@ - (void)setTabBarOriginY:(CGFloat)y animated:(BOOL)animated
     CGFloat toolBarHeight = frame.size.height;
     CGSize viewSize = self.tabBarController.view.frame.size;
     CGFloat viewHeight = UIInterfaceOrientationIsPortrait(self.interfaceOrientation) ? viewSize.height : viewSize.width;
-
     CGFloat topLimit = viewHeight - toolBarHeight;
     CGFloat bottomLimit = viewHeight;