TabBarIOS 组件 - 页面底部 TabBar

该组件用来在 IOS 页面底部显示 TabBar，还包括组件 TabBarIOS.Item

例子代码

'use strict';

import React, {
  Component,
  StyleSheet,
  TabBarIOS,
  Text,
  View,
} from 'react-native';

const base64Icon = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAEsAAABLCAQAAACSR7JhAAADtUlEQVR4Ac3YA2Bj6QLH0XPT1Fzbtm29tW3btm3bfLZtv7e2ObZnms7d8Uw098tuetPzrxv8wiISrtVudrG2JXQZ4VOv+qUfmqCGGl1mqLhoA52oZlb0mrjsnhKpgeUNEs91Z0pd1kvihA3ULGVHiQO2narKSHKkEMulm9VgUyE60s1aWoMQUbpZOWE+kaqs4eLEjdIlZTcFZB0ndc1+lhB1lZrIuk5P2aib1NBpZaL+JaOGIt0ls47SKzLC7CqrlGF6RZ09HGoNy1lYl2aRSWL5GuzqWU1KafRdoRp0iOQEiDzgZPnG6DbldcomadViflnl/cL93tOoVbsOLVM2jylvdWjXolWX1hmfZbGR/wjypDjFLSZIRov09BgYmtUqPQPlQrPapecLgTIy0jMgPKtTeob2zWtrGH3xvjUkPCtNg/tm1rjwrMa+mdUkPd3hWbH0jArPGiU9ufCsNNWFZ40wpwn+62/66R2RUtoso1OB34tnLOcy7YB1fUdc9e0q3yru8PGM773vXsuZ5YIZX+5xmHwHGVvlrGPN6ZSiP1smOsMMde40wKv2VmwPPVXNut4sVpUreZiLBHi0qln/VQeI/LTMYXpsJtFiclUN+5HVZazim+Ky+7sAvxWnvjXrJFneVtLWLyPJu9K3cXLWeOlbMTlrIelbMDlrLenrjEQOtIF+fuI9xRp9ZBFp6+b6WT8RrxEpdK64BuvHgDk+vUy+b5hYk6zfyfs051gRoNO1usU12WWRWL73/MMEy9pMi9qIrR4ZpV16Rrvduxazmy1FSvuFXRkqTnE7m2kdb5U8xGjLw/spRr1uTov4uOgQE+0N/DvFrG/Jt7i/FzwxbA9kDanhf2w+t4V97G8lrT7wc08aA2QNUkuTfW/KimT01wdlfK4yEw030VfT0RtZbzjeMprNq8m8tnSTASrTLti64oBNdpmMQm0eEwvfPwRbUBywG5TzjPCsdwk3IeAXjQblLCoXnDVeoAz6SfJNk5TTzytCNZk/POtTSV40NwOFWzw86wNJRpubpXsn60NJFlHeqlYRbslqZm2jnEZ3qcSKgm0kTli3zZVS7y/iivZTweYXJ26Y+RTbV1zh3hYkgyFGSTKPfRVbRqWWVReaxYeSLarYv1Qqsmh1s95S7G+eEWK0f3jYKTbV6bOwepjfhtafsvUsqrQvrGC8YhmnO9cSCk3yuY984F1vesdHYhWJ5FvASlacshUsajFt2mUM9pqzvKGcyNJW0arTKN1GGGzQlH0tXwLDgQTurS8eIQAAAABJRU5ErkJggg==';

class TabBarExample extends Component {
  constructor(props, context) {
    super(props, context);
    this.state = {
      selectedTab: 'redTab',
      notifCount: 0,
      presses: 0,
    };
  }

  _renderContent(color, pageText, num) {
    return (
      <View style={[styles.tabContent, {backgroundColor: color}]}>
        <Text style={styles.tabText}>{pageText}</Text>
        <Text style={styles.tabText}>{num} re-renders of the {pageText}</Text>
      </View>
    );
  }

  render() {
    /*eslint-disable global-require*/
    return (
      <TabBarIOS
        tintColor="white"
        barTintColor="darkslateblue"
        translucent={true}>
        <TabBarIOS.Item
          title="Blue Tab"
          icon={{uri: base64Icon, scale: 3}}
          selected={this.state.selectedTab === 'blueTab'}
          onPress={() => {
            this.setState({
              selectedTab: 'blueTab',
            });
          }}>
          {this._renderContent('#414A8C', 'Blue Tab')}
        </TabBarIOS.Item>
        <TabBarIOS.Item
          systemIcon="history"
          badge={this.state.notifCount > 0 ? this.state.notifCount : undefined}
          selected={this.state.selectedTab === 'redTab'}
          onPress={() => {
            this.setState({
              selectedTab: 'redTab',
              notifCount: this.state.notifCount + 1,
            });
          }}>
          {this._renderContent('#783E33', 'Red Tab', this.state.notifCount)}
        </TabBarIOS.Item>
        <TabBarIOS.Item
          icon={require('../images/flux.png')}
          title="More"
          selected={this.state.selectedTab === 'greenTab'}
          onPress={() => {
            this.setState({
              selectedTab: 'greenTab',
              presses: this.state.presses + 1
            });
          }}>
          {this._renderContent('#21551C', 'Green Tab', this.state.presses)}
        </TabBarIOS.Item>
      </TabBarIOS>
    );
  }

}

const styles = StyleSheet.create({
  tabContent: {
    flex: 1,
    alignItems: 'center',
  },
  tabText: {
    color: 'white',
    margin: 50,
  },
});

export default TabBarExample;

中英文官方说明

http://reactnative.cn/docs/tabbarios.html#content

https://facebook.github.io/react-native/docs/tabbarios.html#content