修改ios下拉刷新模式的机制

Author: CarGuo

lib/widget/pull/gsy_pull_new_load_widget.dart

@@ -1,5 +1,5 @@
 import 'package:flare_flutter/flare_actor.dart';
-import 'package:flutter/cupertino.dart' as IOS;
+import 'package:gsy_github_app_flutter/widget/pull/gsy_refresh_sliver.dart' as IOS;
 import 'package:flutter/material.dart';
 import 'package:flutter_spinkit/flutter_spinkit.dart';
 import 'package:gsy_github_app_flutter/common/style/gsy_style.dart';
@@ -45,6 +45,9 @@ class GSYPullLoadWidget extends StatefulWidget {
 class _GSYPullLoadWidgetState extends State<GSYPullLoadWidget>
     with GSYFlarePullController {
     //with GSYFlarePullMutliController {
+
+  final GlobalKey<IOS.CupertinoSliverRefreshControlState> sliverRefreshKey = GlobalKey<IOS.CupertinoSliverRefreshControlState>();
+
   ScrollController _scrollController;
 
   bool isRefreshing = false;
@@ -184,32 +187,40 @@ class _GSYPullLoadWidgetState extends State<GSYPullLoadWidget>
   Widget build(BuildContext context) {
     if (widget.userIos) {
       ///用ios模式的下拉刷新
-      return CustomScrollView(
-        controller: _scrollController,
-
-        ///回弹效果
-        physics: const CustomBouncingScrollPhysics(
-            parent: AlwaysScrollableScrollPhysics(),
-            refreshHeight: iosRefreshHeight),
-        slivers: <Widget>[
-          ///控制显示刷新的 CupertinoSliverRefreshControl
-          IOS.CupertinoSliverRefreshControl(
-            refreshIndicatorExtent: iosRefreshIndicatorExtent,
-            refreshTriggerPullDistance: iosRefreshHeight,
-            onRefresh: handleRefresh,
-            builder: buildSimpleRefreshIndicator,
-          ),
-          SliverSafeArea(
-            sliver: SliverList(
-              delegate: SliverChildBuilderDelegate(
-                (BuildContext context, int index) {
-                  return _getItem(index);
-                },
-                childCount: _getListCount(),
+      return new NotificationListener(
+        onNotification: (ScrollNotification notification) {
+          ///通知 CupertinoSliverRefreshControl 当前的拖拽状态
+          sliverRefreshKey.currentState.notifyScrollNotification(notification);
+          return false;
+        },
+        child: CustomScrollView(
+          controller: _scrollController,
+
+          ///回弹效果
+          physics: const CustomBouncingScrollPhysics(
+              parent: AlwaysScrollableScrollPhysics(),
+              refreshHeight: iosRefreshHeight),
+          slivers: <Widget>[
+            ///控制显示刷新的 CupertinoSliverRefreshControl
+            IOS.CupertinoSliverRefreshControl(
+              key: sliverRefreshKey,
+              refreshIndicatorExtent: iosRefreshIndicatorExtent,
+              refreshTriggerPullDistance: iosRefreshHeight,
+              onRefresh: handleRefresh,
+              builder: buildSimpleRefreshIndicator,
+            ),
+            SliverSafeArea(
+              sliver: SliverList(
+                delegate: SliverChildBuilderDelegate(
+                      (BuildContext context, int index) {
+                    return _getItem(index);
+                  },
+                  childCount: _getListCount(),
+                ),
               ),
             ),
-          ),
-        ],
+          ],
+        ),
       );
     }