const AppTabNav = TabNavigator({
Home: {
    screen: AppStack,
    navigationOptions: {
        fontSize: 4,
    }
},
Notification: {
    screen: RequestStack,
    navigationOptions: {
        // headerTitle: 'HRIS',
        // label: 'HRIS',
        fontSize: 4
    }
},
Request222: {
    screen: NotifStack,
    navigationOptions: {
        headerTitle: 'HRIS',
        label: 'HRIS',
        fontSize: 4
    }
},},

{
    tabBarPosition: 'bottom',
    animationEnabled: true,
    swipeEnabled: true,
    tabBarOptions: {
        activeTintColor: '#022846',
        // inactiveBackgroundColor: '#89898b',
        inactiveTintColor: '#89898b',
        upperCaseLabel: false,
        // activeBackgroundColor:'#fff',
        showLabel: true,
        showIcon: true,
        // style: styles.tabBar,
        style: {
            backgroundColor: '#eaeaec'
        },
    },
});