docs(picker): add picker example

Author: 2534290808

README.md

@@ -21,7 +21,7 @@ To use this plugin, add `flutter_weui` as a [dependency in your pubspec.yaml fil
 - [`LoadMore`](https://github.com/flutter-studio/flutter-weui/blob/master/example/lib/load_more_example.dart)
 - [`MediaBox`](https://github.com/flutter-studio/flutter-weui/blob/master/example/lib/media_box_example.dart)
 - [`Panel`](https://github.com/flutter-studio/flutter-weui/blob/master/example/lib/panel_example.dart)
-- [`Picker`]()
+- [`Picker`](https://github.com/flutter-studio/flutter-weui/blob/master/example/lib/picker_example.dart)
 - [`Slider`]()
 - [`Switch`]()
 - [`Toast`]()

README_zh-CN.md

@@ -21,7 +21,7 @@
 - [`LoadMore`](https://github.com/flutter-studio/flutter-weui/blob/master/example/lib/load_more_example.dart)
 - [`MediaBox`](https://github.com/flutter-studio/flutter-weui/blob/master/example/lib/media_box_example.dart)
 - [`Panel`](https://github.com/flutter-studio/flutter-weui/blob/master/example/lib/panel_example.dart)
-- [`Picker`]()
+- [`Picker`](https://github.com/flutter-studio/flutter-weui/blob/master/example/lib/picker_example.dart)
 - [`Slider`]()
 - [`Switch`]()
 - [`Toast`]()

example/lib/picker_example.dart

@@ -1,25 +1,16 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_weui/flutter_weui.dart';
-class DialogExample extends StatelessWidget {
+class PickerExample extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(title: Text("Dialog"),),
+      appBar: AppBar(title: Text("Picker"),),
       body: Center(
         child: Column(
           children: <Widget>[
             FlatButton(onPressed: (){
-              WDialog.show(context,title: "Title",content: "Context",actions: [
-                DialogActions(text: "取消"),
-                DialogActions(text: "确定")
-              ]);
-            }, child: Text("Dialog_Android")),
-            FlatButton(onPressed: (){
-              WDialog.show(context,title: "Title",content: "Context",actions: [
-                DialogActions(text: "取消"),
-                DialogActions(text: "确定")
-              ],platform: TargetPlatform.iOS);
-            }, child: Text("Dialog_Ios"))
+              Picker.show(context,data: ["item1","item2","item2","item4"]);
+            }, child: Text("Picker"))
           ],
         ),
       ),