From 5d8da7830beb0c4335b8d8b04731a3ec8d9b9fc4 Mon Sep 17 00:00:00 2001
From: warmhug <hualei5280@gmail.com>
Date: Fri, 4 May 2018 14:08:50 +0800
Subject: [PATCH] Revert "optimize"

---
 src/PickerMixin.tsx | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/PickerMixin.tsx b/src/PickerMixin.tsx
index 609df4a..04a9c3d 100644
--- a/src/PickerMixin.tsx
+++ b/src/PickerMixin.tsx
@@ -32,7 +32,13 @@ export default function(ComposedComponent) {
     }
 
     coumputeChildIndex(top, itemHeight, childrenLength) {
-      const index = Math.round(top / itemHeight);
+      let index = top / itemHeight;
+      const floor = Math.floor(index);
+      if (index - floor > 0.5) {
+        index = floor + 1;
+      } else {
+        index = floor;
+      }
       return Math.min(index, childrenLength - 1);
     }