From e653484f39ffa9e17a1747ea9cd066c1faff0f7c Mon Sep 17 00:00:00 2001
From: neverland <chenjiahan@youzan.com>
Date: Tue, 16 Jul 2019 20:56:22 +0800
Subject: [PATCH] [improvement] extract resetScroll function (#3869)

---
 src/field/index.js            | 11 ++---------
 src/stepper/index.js          | 10 ++--------
 src/utils/dom/reset-scroll.ts | 16 ++++++++++++++++
 3 files changed, 20 insertions(+), 17 deletions(-)
 create mode 100644 src/utils/dom/reset-scroll.ts

diff --git a/src/field/index.js b/src/field/index.js
index d5ac2d1a063..970f46bd20e 100644
--- a/src/field/index.js
+++ b/src/field/index.js
@@ -2,9 +2,8 @@ import Icon from '../icon';
 import Cell from '../cell';
 import { cellProps } from '../cell/shared';
 import { preventDefault } from '../utils/dom/event';
-import { getRootScrollTop, setRootScrollTop } from '../utils/dom/scroll';
+import { resetScroll } from '../utils/dom/reset-scroll';
 import { createNamespace, isObj, isDef, addUnit } from '../utils';
-import { isIOS } from '../utils/validate/system';
 
 const [createComponent, bem] = createNamespace('field');
 
@@ -134,13 +133,7 @@ export default createComponent({
     onBlur(event) {
       this.focused = false;
       this.$emit('blur', event);
-
-      // Hack for iOS12 page scroll
-      // https://developers.weixin.qq.com/community/develop/doc/00044ae90742f8c82fb78fcae56800
-      /* istanbul ignore next */
-      if (isIOS()) {
-        setRootScrollTop(getRootScrollTop());
-      }
+      resetScroll();
     },
 
     onClick(event) {
diff --git a/src/stepper/index.js b/src/stepper/index.js
index 5c6224d9d06..f9c7939c609 100644
--- a/src/stepper/index.js
+++ b/src/stepper/index.js
@@ -1,6 +1,5 @@
 import { createNamespace, isDef, addUnit } from '../utils';
-import { getRootScrollTop, setRootScrollTop } from '../utils/dom/scroll';
-import { isIOS } from '../utils/validate/system';
+import { resetScroll } from '../utils/dom/reset-scroll';
 
 const [createComponent, bem] = createNamespace('stepper');
 
@@ -156,12 +155,7 @@ export default createComponent({
         event.target.value = this.currentValue;
       }
 
-      // Hack for iOS12 page scroll
-      // https://developers.weixin.qq.com/community/develop/doc/00044ae90742f8c82fb78fcae56800
-      /* istanbul ignore next */
-      if (isIOS()) {
-        setRootScrollTop(getRootScrollTop());
-      }
+      resetScroll();
     },
 
     longPressStep() {
diff --git a/src/utils/dom/reset-scroll.ts b/src/utils/dom/reset-scroll.ts
new file mode 100644
index 00000000000..8cdf18a4007
--- /dev/null
+++ b/src/utils/dom/reset-scroll.ts
@@ -0,0 +1,16 @@
+/**
+ * Hack for iOS12 page scroll
+ * https://developers.weixin.qq.com/community/develop/doc/00044ae90742f8c82fb78fcae56800
+ */
+
+import { isIOS as checkIsIOS } from '../validate/system';
+import { getRootScrollTop, setRootScrollTop } from './scroll';
+
+const isIOS = checkIsIOS();
+
+/* istanbul ignore next */
+export function resetScroll() {
+  if (isIOS) {
+    setRootScrollTop(getRootScrollTop());
+  }
+}