react-native-simplest-tab-navigator
property tabBarHeight was required
usage:
<TabNavigator tabBarHeight={55}>
<TabNavigator.Item
selected={ this.state.selectedIndex === 0 }
view={ leftView }
onPress={ () => this.setState({selectedIndex: 0}) }
>
<Text>left</Text>
</TabNavigator.Item>
<TabNavigator.Item
selected={ this.state.selectedIndex === 1 }
view={ rightView }
onPress={ () => this.setState({selectedIndex: 1}) }
>
<Text>right</Text>
</TabNavigator.Item>
</TabNavigator>