import React,{Component}from 'react';

import {

  AppRegistry,

  StyleSheet,

  Text,

  View,

  TabBarIOS,

} from 'react-native';

import History from './History'

class TabBarIOSDemo extends Component {

  constructor(props){

    super(props);

    this.state={

      selectedTab: '发现',

       notifCount: 0,

       presses: 0,

    };

  }

  //进行渲染页面内容

  _renderContent(color: string, pageText: string, num: number) {

    return (

      <View style={[styles.tabContent, {backgroundColor: color}]}>

        <Text style={styles.tabText}>{pageText}</Text>

      </View>

    );

  }

  render() {

    return (

      <View style={{flex:1}}>

        <TabBarIOS

        style={{flex:1,alignItems:"flex-end"}}

        tintColor="green"/*被选中状态颜色图片和文字*/

        barTintColor="#000">

        <TabBarIOS.Item

          title="主页"

          icon={require('./img/1.png')}

          selected={this.state.selectedTab === '主页'}

          onPress={() => {

            this.setState({

              selectedTab: '主页',

            });

          }}

          >

          {this._renderContent('#414A8C', 'one')}

        </TabBarIOS.Item>

        <TabBarIOS.Item

          title="发现"

          icon={require('./img/2.png')}

          selected={this.state.selectedTab === '发现'}

          onPress={() => {

            this.setState({

              selectedTab: '发现',

              notifCount: this.state.notifCount + 1,

            });

          }}

          >

          {this._renderContent('#cccccc', '发现', this.state.notifCount)}

        </TabBarIOS.Item>

        <TabBarIOS.Item

          title="我的"

          icon={require('./img/3.png')}

          selected={this.state.selectedTab === '我的'}

          badge={this.state.notifCount > 0 ? this.state.notifCount : undefined}

          onPress={() => {

            this.setState({

              selectedTab: '我的',

              notifCount: this.state.notifCount + 1,

            });

          }}

          >

          {this._renderContent('#783E33', '历史记录', this.state.notifCount)}

        </TabBarIOS.Item>

        <TabBarIOS.Item

           title="信息"

           icon={require('./img/4.png')}

           selected={this.state.selectedTab === '下载'}

            onPress={() => {

            this.setState({

              selectedTab: '下载',

              presses: this.state.presses + 1

            });

          }}>

           {this._renderContent('#21551C', '下载页面', this.state.presses)}

        </TabBarIOS.Item>

      </TabBarIOS>

      </View>

    );

  }

}

const styles = StyleSheet.create({

  tabContent: {

    flex: 1,

    alignItems: 'center',

  },

  welcome: {

    fontSize: 20,

    textAlign: 'center',

    marginTop: 20,

  },

  tabText: {

    color: 'white',

    margin: 50,

  },

});

AppRegistry.registerComponent('Allen', () => TabBarIOSDemo )