Reactnative 在 React Native 中更改应用程序背景 colored颜色

我正在try 在react-native 应用程序中将背景 colored颜色 从灰色更改为白色.我正在使用react navigation在渲染后生成TabNavigator.我试着把这个TabNavigator放在一个视图中并设置背景色，但所有的屏幕都变成了白色.我该怎么解决这个问题？

index.js

...
render() {
    return (
        <View style={{ backgroundColor: '#FFFFFF'}}>
            <Tabs />
        </View>
    )
  }
...

Tabs

...
const Tabs = TabNavigator(
  {
    Home: {
      screen: HomeStack,
      navigationOptions: {
        title: 'Acasa',
      },
    },
    ...
    Account: {
      screen: AccountScreen,
      navigationOptions: {
        title: 'Contul meu',
      },
    },
  },
  {
    tabBarComponent: props => <FooterNavigation {...props} />,
    tabBarPosition: 'bottom',
    initialRouteName: 'Home',
  },
);
...

Home Screen

render() {
    const {
      data, refreshing, loading, error,
    } = this.state;

    return (
      <ScrollView>
        <Container>
          {error && <Text>Error</Text>}
          {loading && <ActivityIndicator animating size="large" />}

          <List>
            <FlatList
              data={data}
              renderItem={({ item }) => (
                <ListItem onPress={() => this.props.navigation.navigate('Item', item)}>
                  <Item data={item} />
                </ListItem>
              )}
              // ID from database as a key
              keyExtractor={item => item.title}
              ItemSeparatorComponent={this.renderSeparator}
              ListFooterComponent={this.renderFooter}
              ListHeaderComponent={this.renderHeader}
              refreshing={refreshing}
              onRefresh={this.handleRefresh}
              onEndReached={this.handleLoadMore}
              onEndReachedThreshold={0}
            />
          </List>
        </Container>
      </ScrollView>
    );
  }