From 873149499088d25c130742fc7b3d90e7ef280e6f Mon Sep 17 00:00:00 2001
From: dragonwong <814465104@qq.com>
Date: Mon, 6 Jun 2016 07:27:01 -0700
Subject: [PATCH] change leftButton init position

Summary:
In navigationBar, when back to the previous view, the left button of the previous view should fade in like iOS native navBar, instead of move in. It's interesting that the right button acts correct.

React Native:

![clear](https://cloud.githubusercontent.com/assets/2622602/15535443/fa5e77bc-229f-11e6-8632-0dd9f5f2fb26.gif)

iOS Native:

![clear2](https://cloud.githubusercontent.com/assets/2622602/15535452/05999918-22a0-11e6-877c-63590b7bb9ef.gif)
Closes https://github.com/facebook/react-native/pull/7745

Differential Revision: D3392307

Pulled By: nicklockwood

fbshipit-source-id: e5384140049bf7b6f78fc093209ee48814a2ffdc
---
 .../Navigator/NavigatorNavigationBarStylesIOS.js                | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Libraries/CustomComponents/Navigator/NavigatorNavigationBarStylesIOS.js b/Libraries/CustomComponents/Navigator/NavigatorNavigationBarStylesIOS.js
index 1ae2a94ea..8163d4967 100644
--- a/Libraries/CustomComponents/Navigator/NavigatorNavigationBarStylesIOS.js
+++ b/Libraries/CustomComponents/Navigator/NavigatorNavigationBarStylesIOS.js
@@ -77,7 +77,7 @@ var BASE_STYLES = {
 var Stages = {
   Left: {
     Title: merge(BASE_STYLES.Title, { left: -SCREEN_WIDTH / 2, opacity: 0 }),
-    LeftButton: merge(BASE_STYLES.LeftButton, { left: -SCREEN_WIDTH / 3, opacity: 0 }),
+    LeftButton: merge(BASE_STYLES.LeftButton, { left: 0, opacity: 0 }),
     RightButton: merge(BASE_STYLES.RightButton, { opacity: 0 }),
   },
   Center: {