Question

整个导航堆栈中只有一个文件。在我的导航标题中，有一个菜单，我想打开一个抽屉。现在，在此示例中，我得到了错误：Cannot read property 'navigation' of undefined

我的AppNavigation文件：

import React from 'react';
import { Text } from 'react-native';
import { createStackNavigator, createDrawerNavigator } from 'react-navigation';
import  Login from '../components/Login';
import Dashboard from '../components/Dashboard';
import NewNotification from '../components/NewNotification';


const GuestStack = createStackNavigator(
  {
    loginScreen: { screen: Login },
  }, { 
    headerMode: 'float',
    headerLayoutPreset: 'center',
    navigationOptions: {
      headerStyle: { backgroundColor: '#61b1cd' },
      title: 'Welcome',
      headerTintColor: 'black',
    },
  },
);

const LoggedinStack = createDrawerNavigator({
  dashboard: { screen: Dashboard },
  newNotifciation: { screen: NewNotification },
});

const LoggedinNavigation = createStackNavigator(
  {
    LoggedinStack: { screen: LoggedinStack },
  }, {
    headerMode: 'float',
    navigationOptions: {
      headerStyle: { backgroundColor: '#61b1cd' },
      title: 'Welkom!',
      headerTintColor: 'black',
      headerLeft: <Text onPress = { () =>
        this.props.navigation.openDrawer('dashboard')
//  navigation.openDrawer('dashboard')
       }>Menu</Text>,
    },
  },
);

const VveNavigator = createStackNavigator(
  {
    guestStack: {
      screen: GuestStack,
    },
    loggedinStack: {
      screen: LoggedinNavigation,
    },
  }, {
    headerMode: 'none',
    initialRouteName: 'guestStack',
  },
);

export default AppNavigator;

问题似乎在这里：

headerLeft: <Text onPress = { () =>
            this.props.navigation.openDrawer('dashboard')
    //  navigation.openDrawer('dashboard')
           }>Menu</Text>,

然后在我的App.js中

export default class App extends React.Component {
  render() {
    return (
      <APPNavigator />
    );
  }
}

反应导航的版本为2.18.1

谢谢

Answer 1

headerLeft没有收到navigation道具（选中source code）。因此，如果您想在印刷机上使用导航道具，则应考虑重构您的堆栈导航器配置：

const LoggedinNavigation = createStackNavigator(
  {
    LoggedinStack: { screen: LoggedinStack },
  }, {
    headerMode: 'float',
    navigationOptions: ({ navigation }) => ({ // here you get the navigation
      headerStyle: { backgroundColor: '#61b1cd' },
      title: 'Welkom!',
      headerTintColor: 'black',
      headerLeft: (
        <Text
          onPress={() => {
            navigation.openDrawer()
          }}
        >
          Menu
        </Text>
      ),
    }),
  },
);

检查this issue以获得更多选项。

无法导航到导航堆栈中的路线。

1 个答案: