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
- Run
npm install react-native-scrollable-tab-view --save
var ScrollableTabView = require('react-native-scrollable-tab-view');
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>
);
}
}
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)} style={[styles.tab]}>
<Text style={{color: isTabActive ? 'navy' : 'black', fontWeight: isTabActive ? 'bold' : 'normal'}}>{name}</Text>
</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;
renderTabBar
(Function:ReactComponent) - should return a component to use as the tab bar. The component hasgoToPage
,tabs
,activeTab
andref
added to the props, and should implementsetAnimationValue
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 selectededgeHitWidth
(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.hasTouch
(Function) - returnstrue
when ScrollableTabView starts being panned andfalse
when it is released. Not triggered whenlocked
(Bool) is true.locked
(Bool) - dynamically disable scrolling between tabs.springTension
(Integer) - a number between1
and100
, controls the amount of tension on the spring that guides the scroll animation - see example.springFriction
(Integer) - a number between1
and30
, controls the amount of friction on the spring that guides the scroll animation - see example.clampSpring
(Bool) - iftrue
, the spring will not bounce at all - iffalse
, it will oscillate around the target value before settling.children
(ReactComponents) - each top-level child component should have atabLabel
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