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当我导航到 myFeedScreen时,它只显示白色背景。但是我的FeedScreen包含背景图像和按钮等。有谁知道为什么我只得到一个白屏?我的导航由 my 组成MainTabNav,它是包含三个选项卡的标签栏,其中一个是DiscoverNav,这是另一个 TabBar,应该显示两个不同的屏幕,但它只显示白色背景。谢谢!顺便说一句,我正在使用 React-Navigation 进行导航!谢谢!

const DiscoverNav = TabNavigator({
  Feed: {
    screen: FeedScreen
  },
  Dank: {
    screen: DankScreen
  },
  //Add in more tabs here
},
{
  tabBarPosition: 'top'
});


const TicketNav = TabNavigator({
  Tickets: {
    screen: TicketScreen
  },
  History: {
    screen: HistoryScreen
  },
  //Add in more tabs here
},
{
  tabBarPosition: 'top'
});

const MainTabNav = TabNavigator({
  Discover: {
    screen: DiscoverNav
  },
  Tickets: {
    screen: TicketNav
  },
  Profile: {
    screen: FeedScreen
  }
},
{
  tabBarPosition: 'bottom'
});
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