irfaan/react-native-scrollable-tab-view

react-native-scrollable-tab-view

This is probably my favorite navigation pattern on Android, I wish it
were more common on iOS! This is a very simple JavaScript-only
implementation of it for React Native. For more information about how
the animations behind this work, check out the Rebound section of the
React Native Animation Guide

Add it to your project

Run npm install react-native-scrollable-tab-view --save
var ScrollableTabView = require('react-native-scrollable-tab-view');

Demo

Try out a slightly out of date version here on rnplay.org

Basic usage

var ScrollableTabView = require('react-native-scrollable-tab-view');

var App = React.createClass({
  render() {
    return (
      <ScrollableTabView>
        <ReactPage tabLabel="React" />
        <FlowPage tabLabel="Flow" />
        <JestPage tabLabel="Jest" />
      </ScrollableTabView>
    );
  }
}

Injecting a custom tab bar

Suppose we had a custom tab bar called CustomTabBar, we would inject
it into our ScrollableTabView like this:

var ScrollableTabView = require('react-native-scrollable-tab-view');
var CustomTabBar = require('./CustomTabBar');

var App = React.createClass({
  render() {
    return (
      <ScrollableTabView renderTabBar={() => <CustomTabBar someProp={'here'} />}>
        <ReactPage tabLabel="React" />
        <FlowPage tabLabel="Flow" />
        <JestPage tabLabel="Jest" />
      </ScrollableTabView>
    );
  }
}

Below is the default tab bar, renamed to CustomTabBar, you can use this
as a template for implementing your own.

var React = require('react-native');
var {
  StyleSheet,
  Text,
  View,
  TouchableOpacity,
} = React;

var deviceWidth = require('Dimensions').get('window').width;
var precomputeStyle = require('precomputeStyle');
var TAB_UNDERLINE_REF = 'TAB_UNDERLINE';

var styles = StyleSheet.create({
  tab: {
    flex: 1,
    alignItems: 'center',
    justifyContent: 'center',
    paddingBottom: 10,
  },

  tabs: {
    height: 50,
    flexDirection: 'row',
    marginTop: 20,
    borderWidth: 1,
    borderTopWidth: 0,
    borderLeftWidth: 0,
    borderRightWidth: 0,
    borderBottomColor: '#ccc',
  },
});

var CustomTabBar = React.createClass({
  propTypes: {
    goToPage: React.PropTypes.func,
    activeTab: React.PropTypes.number,
    tabs: React.PropTypes.array
  },

  renderTabOption(name, page) {
    var isTabActive = this.props.activeTab === page;

    return (
      <TouchableOpacity key={name} onPress={() => this.props.goToPage(page)}>
        <View style={[styles.tab]}>
          <Text style={{color: isTabActive ? 'navy' : 'black', fontWeight: isTabActive ? 'bold' : 'normal'}}>{name}</Text>
        </View>
      </TouchableOpacity>
    );
  },

  setAnimationValue(value) {
    this.refs[TAB_UNDERLINE_REF].setNativeProps(precomputeStyle({
      left: (deviceWidth * value) / this.props.tabs.length
    }));
  },

  render() {
    var numberOfTabs = this.props.tabs.length;
    var tabUnderlineStyle = {
      position: 'absolute',
      width: deviceWidth / numberOfTabs,
      height: 4,
      backgroundColor: 'navy',
      bottom: 0,
    };

    return (
      <View style={styles.tabs}>
        {this.props.tabs.map((tab, i) => this.renderTabOption(tab, i))}
        <View style={tabUnderlineStyle} ref={TAB_UNDERLINE_REF} />
      </View>
    );
  },
});

module.exports = CustomTabBar;

Props

renderTabBar (Function:ReactComponent) - should return a component to use as
the tab bar. The component has goToPage, tabs, activeTab and
ref added to the props, and should implement setAnimationValue to
be able to animate itself along with the tab content.
onChangeTab (Function) - function to call when tab changes, should accept 1 argument which is an Object containing two keys: i: the index of the tab that is selected, ref: the ref of the tab that is selected
edgeHitWidth (Integer) - region (in pixels) from the left & right edges of the screen that can trigger swipe. Default is 30, which is the same as the swipe-back gesture on iOS.
springTension (Integer) - a number between 1 and 100, controls the amount of tension on the spring that guides the scroll animation - see example.
springFriction (Integer) - a number between 1 and 30, controls the amount of friction on the spring that guides the scroll animation - see example.
clampSpring (Bool) - if true, the spring will not bounce at all - if false, it will oscillate around the target value before settling.
children (ReactComponents) - each top-level child component should have a tabLabel prop that can be used by the tab bar component to render out the labels. The default tab bar expects it to be a string, but you can use anything you want if you make a custom tab bar.

MIT Licensed