createStackNavigator标题问题

Question

对于导航文件的一部分，我有以下createDrawerNavigator：

const DrawerNavigation = createDrawerNavigator({
  Home: {
    screen: HomePage,
    navigationOptions: {
      title: "Home"
    }
  },
      Loads: {
    screen: LoadTabs,
    navigationOptions: {
      title: "Loads"
    }
  },
        LoadsDetails: {
    screen: LoadsDetails,
    navigationOptions: {
      title: "Load Details"
    }
  },...

然后我有实际的createStackNavigator设置引用了上面的内容：

const StackNavigation = createStackNavigator({
  DrawerNavigation: { screen: DrawerNavigation }
}, {
    headerMode: 'float',
    navigationOptions: ({ navigation, screenProps }) => ({
      headerStyle: { backgroundColor: '#4C3E54' },
      headerTintColor: 'white',
      headerLeft: drawerButton(navigation),
      headerRight: cartButton(navigation, screenProps)
    })
  });

我的问题是，尽管一切正常，但标题从未出现在任何屏幕上。我是否以某种方式在createDrawerNavigator中设置不正确？如果是这样，更合适的方式是什么？

谢谢！