Segmented View for React Native (with animation)

<SegmentedView
    titles={["First", "Second", "Third"]}
    index={this.state.index}
    stretch
    onPress={index => this.setState({ index })}
/>

• titles: (array) => an array of renderables, or arbitrary data if you specify a renderTitle function
• index: (number) => the index of the selected title
• stretch: (bool) => whether or not the titles fill in the space inbetween each other
• onPress: (function(index:number)) => event when a title is tapped, with the index of the title passed in
• renderTitle: (function(title: any, index:number)) => if specified, this function will be called for each
• duration: (number) => the length (in ms) of the animation of the bar from one title to the other when it gets selected
• onTransitionStart: (function) => called when a transition animation starts
• onTransitionEnd: (function) => called when a transition animation ends
• barColor: (string) => the color of the highlight bar
• barPosition: (string) => the position of the highlight bar.
• underlayColor: (string) => the underlay color of a title block
• selectedTitleStyle: (object) => the style of the selected title block
• titleStyle: (object) => the style of a normal (unselected) title block