Merge branch 'develop' into dev/yisheng

* develop:
  文案描述
  feat(CupertinoTabView demo):
  Update README-en.md
  feat(add English intro from Allsimon pull request):
  feat(add CupertinoTabScaffold):
  feat(add CupertinoTabBar demo):
  Update index.dart
  add license
  +LICENSE
  translate: translate the README to En locale
  update(version) and readme.md

lib/widgets/components/Bar/SliverAppBar/demo.dart

@@ -48,7 +48,7 @@ class SliverAppBarLessDefault extends StatelessWidget {
     }
     return new SizedBox(
         height: 500.0,
-        child:NestedScrollView(
+        child: NestedScrollView(
           headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
             return <Widget>[
               SliverAppBar(

lib/widgets/components/Dialog/AboutDialog/index.dart

@@ -35,7 +35,7 @@ class _DemoState extends State<Demo> {
   @override
   Widget build(BuildContext context) {
     return WidgetDemo(
-      title: 'AlertDialog',
+      title: 'AboutDialog',
       codeUrl: 'components/Dialog/AboutDialog/demo.dart',
       contentList: [
         _Text0,

lib/widgets/themes/Cupertino/CupertinoTabBar/demo.dart

@@ -0,0 +1,53 @@
+/**
+ * Created with Android Studio.
+ * User: 三帆
+ * Date: 20/01/2019
+ * Time: 22:28
+ * email: sanfan.hx@alibaba-inc.com
+ * tartget:  CupertinoTabBar
+ */
+
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+
+class CupertinoTabBarDemo extends StatefulWidget {
+  _Demo createState() => _Demo();
+}
+
+class _Demo extends State<CupertinoTabBarDemo> {
+  int index = 0;
+
+  changeIndex(int _index) {
+    this.setState(() {
+      index = _index;
+    });
+  }
+  Widget build(BuildContext context) {
+    return Container(
+      height: 500,
+      child: Scaffold(
+          appBar: AppBar(title: const Text('CupertinoTabBarDemo')),
+          floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
+          body: Center(
+            child: Text('CupertinoTabBarDemo in bottom'),
+          ),
+          bottomNavigationBar: CupertinoTabBar(
+            backgroundColor: Color.fromRGBO(244, 244, 244, 0.5),
+            currentIndex: index,
+            onTap: (i) {
+              this.changeIndex(i);
+            },
+            items: [
+              BottomNavigationBarItem(
+                title: Text("1"),
+                icon: Icon(Icons.add),
+              ),
+              BottomNavigationBarItem(
+                  title: Text("2"),
+                  icon: Icon(Icons.delete)
+              )],
+          )
+      ),
+    );
+  }
+}

lib/widgets/themes/Cupertino/CupertinoTabBar/index.dart

@@ -0,0 +1,44 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_go/common/widget_demo.dart';
+import 'package:flutter_go/widgets/themes/Material/MaterialColor/demo.dart';
+import 'demo.dart';
+const Text0 = '''
+### **简介**
+> ios风格下底部导航组件.
+
+通过BottomNavigationBarItem列表,在屏幕底部展示多个小组件,  默认下选择第一个小组件;
+
+### **基本用法**
+
+这个组件, 没有任何内部状态, 使用时需要开发者自己去监听**onTap**方法, 主动为组件的属性**currentIndex**赋值
+
+在官网上有这么一段文字:
+
+> If the given backgroundColor's opacity is not 1.0 (which is the case by default), it will produce a blurring effect to the content behind it.
+
+本人试了很多次. 也没有发现这个Blur Effect是怎么触发的, 如果有人了解, 欢迎提PR.
+''';
+
+
+class Demo extends StatefulWidget {
+  static const String routeName =
+      '/element/themes/Cupertino/CupertinoTabBar';
+
+  @override
+  State<StatefulWidget> createState() => _DemoState();
+}
+
+class _DemoState extends State<Demo> {
+  @override
+  Widget build(BuildContext context) {
+    return WidgetDemo(
+      title: 'CupertinoTabBar',
+      codeUrl: '/themes/Cupertino/CupertinoTabBar/demo.dart',
+      docUrl: 'https://docs.flutter.io/flutter/cupertino/CupertinoTabBar-class.html',
+      contentList: [
+        Text0,
+        CupertinoTabBarDemo()
+      ],
+    );
+  }
+}

lib/widgets/themes/Cupertino/CupertinoTabScaffold/demo.dart

@@ -0,0 +1,79 @@
+/**
+ * Created with Android Studio.
+ * User: 三帆
+ * Date: 20/01/2019
+ * Time: 22:28
+ * email: sanfan.hx@alibaba-inc.com
+ * tartget:  CupertinoTabBar
+ */
+
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+
+class CupertinoTabScaffoldDemo extends StatefulWidget {
+  _Demo createState() => _Demo();
+}
+
+class _Demo extends State<CupertinoTabScaffoldDemo> {
+  int index = 0;
+
+  changeIndex(int _index) {
+    this.setState(() {
+      index = _index;
+    });
+  }
+  Widget build(BuildContext context) {
+    return SizedBox(
+      height: 500,
+      child: CupertinoTabScaffold(
+        tabBar: CupertinoTabBar(
+          items: <BottomNavigationBarItem> [
+            BottomNavigationBarItem(
+              title: Text("1"),
+              icon: Icon(Icons.add),
+            ),
+            BottomNavigationBarItem(
+              title: Text("2"),
+              icon: Icon(Icons.add),
+            )
+          ],
+        ),
+        tabBuilder: (BuildContext context, int index) {
+          return CupertinoTabView(
+            builder: (BuildContext context) {
+              return CupertinoPageScaffold(
+                navigationBar: CupertinoNavigationBar(
+                  middle: Text('Page 1 of tab $index'),
+                ),
+                child: Center(
+                  child: CupertinoButton(
+                    child: Text('Next page = $index'),
+                    onPressed: () {
+                      Navigator.of(context).push(
+                        CupertinoPageRoute<void>(
+                          builder: (BuildContext context) {
+                            return CupertinoPageScaffold(
+                              navigationBar: CupertinoNavigationBar(
+                                middle: Text('Page 2 of tab $index'),
+                              ),
+                              child: Center(
+                                child: CupertinoButton(
+                                  child: const Text('Back'),
+                                  onPressed: () { Navigator.of(context).pop(); },
+                                ),
+                              ),
+                            );
+                          },
+                        ),
+                      );
+                    },
+                  ),
+                ),
+              );
+            },
+          );
+        },
+      ),
+    );
+  }
+}

lib/widgets/themes/Cupertino/CupertinoTabScaffold/index.dart

@@ -0,0 +1,50 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_go/common/widget_demo.dart';
+import 'package:flutter_go/widgets/themes/Material/MaterialColor/demo.dart';
+import 'demo.dart';
+const Text0 = '''
+### **简介**
+
+> 实现iOS应用程序的选项卡式的根布局与结构。
+
+一个在底部放置标签栏，标签栏之间或后面放置内容的脚手架.
+
+这个脚手架, tabBar组件与tabBuilder组件是必须配置的。如果你为该脚手架配置的tabBar组件是 **CupertinoTabBar**的话. 它会自动监听**CupertinoTabBar**底部的切换事件, 去动态切换主体显示的内容.
+
+
+选项卡的内容是使用**tabBuilder**选项卡生成器生成的。TabBuilder必须能够生成tabbar中组件数组长度相同数量的组件。不活动的选项卡将被移到后台并禁用其动画。
+
+
+使用cupertinobview作为每个选项卡的内容，以支持具有并行导航状态和历史记录的选项卡。
+
+
+通过BottomNavigationBarItem列表,在屏幕底部展示多个小组件,  默认下选择第一个小组件;
+
+### **基本用法**
+
+
+''';
+
+
+class Demo extends StatefulWidget {
+  static const String routeName =
+      '/element/themes/Cupertino/CupertinoTabScaffold';
+
+  @override
+  State<StatefulWidget> createState() => _DemoState();
+}
+
+class _DemoState extends State<Demo> {
+  @override
+  Widget build(BuildContext context) {
+    return WidgetDemo(
+      title: 'CupertinoTabScaffold',
+      codeUrl: '/themes/Cupertino/CupertinoTabScaffold/demo.dart',
+      docUrl: 'https://docs.flutter.io/flutter/cupertino/CupertinoTabScaffold-class.html',
+      contentList: [
+        Text0,
+        CupertinoTabScaffoldDemo()
+      ],
+    );
+  }
+}

lib/widgets/themes/Cupertino/CupertinoTabView/demo.dart

@@ -0,0 +1,94 @@
+/**
+ * Created with Android Studio.
+ * User: 三帆
+ * Date: 20/01/2019
+ * Time: 22:28
+ * email: sanfan.hx@alibaba-inc.com
+ * tartget:  CupertinoTabBar
+ */
+
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+
+class CupertinoTabScaffoldDemo extends StatefulWidget {
+  _Demo createState() => _Demo();
+}
+
+class _Demo extends State<CupertinoTabScaffoldDemo> {
+  int index = 0;
+
+  changeIndex(int _index) {
+    this.setState(() {
+      index = _index;
+    });
+  }
+  Widget build(BuildContext context) {
+    return SizedBox(
+      height: 500,
+      child: CupertinoTabScaffold(
+        tabBar: CupertinoTabBar(
+          items: <BottomNavigationBarItem> [
+            BottomNavigationBarItem(
+              title: Text("A"),
+              icon: Icon(Icons.add),
+            ),
+            BottomNavigationBarItem(
+              title: Text("B"),
+              icon: Icon(Icons.add),
+            )
+          ],
+        ),
+        tabBuilder: (BuildContext context, int index) {
+          return CupertinoTabView(
+            routes: {
+              '/': (context) {
+                return CupertinoPageScaffold(
+                    navigationBar: CupertinoNavigationBar(
+                      middle: Text('Page 1 of tabView $index'),
+                    ),
+                  child: Center(
+                    child: Text('CupertinoTabView /'),
+                  ),
+                );
+              },
+              '/home': (context) {
+                return CupertinoPageScaffold(
+                  navigationBar: CupertinoNavigationBar(
+                    middle: Text('Page 1 of tabView $index'),
+                  ),
+                  child: Center(
+                    child: Text('CupertinoTabView home'),
+                  ),
+                );
+              }
+            },
+            builder: (BuildContext context) {
+              return CupertinoPageScaffold(
+                navigationBar: CupertinoNavigationBar(
+                  middle: Text('Page 1 of tabView $index'),
+                ),
+                  child: Column(
+                    children: <Widget>[
+                      SizedBox(height: 100),
+                      CupertinoButton(
+                        child: Text('Next page is self home page'),
+                        onPressed: () {
+                          Navigator.of(context).pushNamed('/home');
+                        },
+                      ),
+                      CupertinoButton(
+                        child: Text('Next page is home home page'),
+                        onPressed: () {
+                          Navigator.of(context, rootNavigator: true).pushNamed('/home');
+                        },
+                      )
+                    ],
+                  )
+              );
+            },
+          );
+        },
+      ),
+    );
+  }
+}

lib/widgets/themes/Cupertino/CupertinoTabView/index.dart

@@ -0,0 +1,54 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_go/common/widget_demo.dart';
+import 'package:flutter_go/widgets/themes/Material/MaterialColor/demo.dart';
+import 'demo.dart';
+const Text0 = '''
+### **简介**
+
+> 具有自己的**Navigator**状态与历史记录的选项卡视图组件.
+
+在使用时需要注意,该组件有自己的路由体系, 有自己的导航系统, 并且他自身内部的导航系统并不与任何父母元素共享
+
+
+
+### **基本用法**
+
+关于它自身的路由体系, 有以下几点需要注意几点.
+
+- 在它的根路由映射(**'/'**), 当它有 **builder** 属性的时候, 指向**build**的界面, 非得使用**router**中定义的根目录
+- 当组件未设定**builder**时, 在他的路由表 **router** 中, 一定要指定 **'/'** 跟路由, 不然会产生错误.
+- 当指定 **onGenerateRoute** 属性时, 它应该返回一个回空有效的route.
+- 如果所有的配置都未命中, 则会命中 **onUnknownRoute** 属性. 这与MaterialApp一致相同
+
+如果你想从 **CupertinoTabView** 的路由体系, 跳转到外层的路由中, 您需要在跳转时调用 **Navigator**,并设定 **rootNavigator** 参数
+```
+Navigator.of(context, rootNavigator: true)
+```
+
+### **基本实例**
+
+''';
+
+
+class Demo extends StatefulWidget {
+  static const String routeName =
+      '/element/themes/Cupertino/CupertinoTabView';
+
+  @override
+  State<StatefulWidget> createState() => _DemoState();
+}
+
+class _DemoState extends State<Demo> {
+  @override
+  Widget build(BuildContext context) {
+    return WidgetDemo(
+      title: 'CupertinoTabView',
+      codeUrl: '/themes/Cupertino/CupertinoTabView/demo.dart',
+      docUrl: 'https://docs.flutter.io/flutter/cupertino/CupertinoTabView-class.html',
+      contentList: [
+        Text0,
+        CupertinoTabScaffoldDemo()
+      ],
+    );
+  }
+}

lib/widgets/themes/Cupertino/index.dart

@@ -18,6 +18,10 @@ import './CupertinoSegmentedControl/index.dart' as CupertinoSegmentedControl;
 import './CupertinoSliverNavigationBar/index.dart' as CupertinoSliverNavigationBar;
 import './CupertinoSwitch/index.dart' as CupertinoSwitch;
 
+import './CupertinoTabBar/index.dart' as CupertinoTabBar;
+import './CupertinoTabScaffold/index.dart' as CupertinoTabScaffold;
+import './CupertinoTabView/index.dart' as CupertinoTabView;
+
 List<WidgetPoint> widgetPoints = [
   WidgetPoint(
     name: 'CupertinoPopupSurface',
@@ -94,5 +98,20 @@ List<WidgetPoint> widgetPoints = [
     routerName: CupertinoSwitch.Demo.routeName,
     buildRouter: (BuildContext context) => CupertinoSwitch.Demo(),
   ),
+  WidgetPoint(
+    name: 'CupertinoTabBar',
+    routerName: CupertinoTabBar.Demo.routeName,
+    buildRouter: (BuildContext context) => CupertinoTabBar.Demo(),
+  ),
+  WidgetPoint(
+    name: 'CupertinoTabScaffold',
+    routerName: CupertinoTabScaffold.Demo.routeName,
+    buildRouter: (BuildContext context) => CupertinoTabScaffold.Demo(),
+  ),
+  WidgetPoint(
+    name: 'CupertinoTabView',
+    routerName: CupertinoTabView.Demo.routeName,
+    buildRouter: (BuildContext context) => CupertinoTabView.Demo(),
+  ),
 ];