/**
 Sample React Native App
  *  https://github.com/facebook/react-native
  *  @flow
 */ "use strict" import React, {Component} from 'react' import {
      AppRegistry,     View,     Text,     Picker,     StyleSheet } from 'react-native' var PickerData = [     '11',     '22',     '33',     '44',     '55',     '66' ] class HelloWorld extends Component {
      constructor(props) {
          super(props)         this.state={
              firstPickerValue: '1',             secondPickerValue: PickerData[0],         }     }     updateFirstContent(language) {
          this.setState({
              firstPickerValue: language,         })     }     updateSecondContent(language) {
          this.setState({
              secondPickerValue: language,         })     }     /* 必须有这个 key , 详细请参考 scrollview 博文      * 也可以 
     此段代码直接放在Picker组件内,      * 这样就是一条一条的添加,不是通过已知数组循环添加      *  */     renderPicker(key, i) {
          // console.log(key , i)         return 
         }     render() {
          return (             
                     
     
      {this.state.firstPickerValue}
                      
     
       this.updateFirstContent(language)}>                     
                           
                           
                           
                           
                       
                      
     
      {this.state.secondPickerValue}
                      
     
       this.updateSecondContent(language)}>                     {PickerData.map((key, i) => this.renderPicker(key, i))}                 
                  
             );     } } const styles = StyleSheet.create({
      container: {
          flex: 1,         justifyContent: 'center',         alignItems: 'center',         backgroundColor: '#F5FCFF'     },     text: {
          width: 200,
         height: 60,         backgroundColor: 'white',
         justifyContent:'center',
         alignItems: 'center',
         borderRadius: 5,     },     picker:{
          padding: 50     } }) AppRegistry.registerComponent('HelloWorld', () => HelloWorld);