react-native-router-flux选项卡如何更改所选选项卡的图标？

Question

我正在使用react-native-router-flux ^ 4.0.0-beta.21和react-native-vector-icons的导航标签.选择场景后,如何更改图标或更改所选场景图标的颜色？

<Scene
        key='navigationTab'
        tabs
        tabBarStyle={styles.tabBarStyle}
        showLabel={false}
>
        <Scene
                key='home'
                hideNavBar
                icon={SimpleLineIcon}
                name='home'
                size={25}
                component={PostList}
                initial
        />
        <Scene
                key='profile'
                hideNavBar
                icon={FontAwesomeIcon}
                name='user-o'
                size={25}
                component={Register}
        />
</Scene>

现在我已经定义了一个像下面这样的图标,但是我如何传递像焦点道具一样的东西？

const iconBack = () => (
        <TouchableHightLight onPress={console.log('home')} >
                <MaterialIcon
                        name='keyboard-arrow-left'
                        size={28}
                />
        </TouchableHightLight>
);

Answer 1

您可以接收focused图标渲染功能的参数,然后检查当前图标是否被聚焦.

例如:

const SimpleLineIcon= ({ title, focused }) => {
    let image;

    switch (title) {
        case 'firstTab':
            image = focused ? require('firstTabSelected.gif') : require('firstTab.gif');
            break;

        case 'secondTab':
            image = focused ? require('secondTabSelected.gif') : require('secondTab.gif');
            break;
    }

    return ( <Image source={image} /> );
}