Question

这是我第一次使用react native，我想移到另一个屏幕（slide2），出现一个错误，上面写着“未定义不是对象（正在评估navigation.navigate）”。我有点被卡住了，这就是方法我走了。还请您多说明一点，并向我展示添加的内容以及谢谢的地方

slideOne.js页面代码

import 'react-native-gesture-handler';
import {NavigationContainer} from '@react-navigation/native';
import {createStackNavigator} from '@react-navigation/stack';
import React from 'react';
import SlideTwo from './SlideTwo';

import {
  SafeAreaView,
  StyleSheet,
  ScrollView,
  View,
  Text,
  StatusBar,
  TextInput,
  Button,
} from 'react-native';

import {
  Header,
  LearnMoreLinks,
  Colors,
  DebugInstructions,
  ReloadInstructions,
} from 'react-native/Libraries/NewAppScreen';

function SlideOne({navigation}) {
  return (
    <React.Fragment>
      <View style={styles.body}>
        <View style={styles.wrapper}>
          <View style={styles.imageWrap}></View>

          <TextInput
            placeholder="What should we refer to you as?"
            placeholderTextColor="#03444F60"
            style={styles.textInput}
            underlineColorAndroid="transparent"
          />
        </View>
        <View style={styles.label}>
          <Text style={styles.labelText}>First Name</Text>
        </View>

        <View style={styles.textWrap}>
          <Text style={styles.text}>Back</Text>
          <Text style={styles.text}>Next</Text>
        </View>
        <Button
          title="Go to screen two"
          onPress={() => navigation.navigate('SlideTwo')}
        />
      </View>
    </React.Fragment>
  );
}
export default SlideOne;

这是我的index.js所在的路由

    import 'react-native-gesture-handler';
    import {NavigationContainer} from '@react-navigation/native';
    import {createStackNavigator} from '@react-navigation/stack';
    import {AppRegistry} from 'react-native';
    import App from './App';
    import SlideOne from './SlideOne';
    import SlideTwo from './SlideTwo';
    import {name as appName} from './app.json';
    AppRegistry.registerComponent(appName, () => SlideOne);

app.js代码

import React from 'react';
import {createStackNavigator} from '@react-navigation/stack';
import {NavigationContainer} from '@react-navigation/native';

import SlideOne from './SlideOne';
import SlideTwo from './SlideTwo';

// NAVIGATION
const StackNavigator = createStackNavigator();

function App() {
  <NavigationContainer>
    <StackNavigator.Navigator>
      <StackNavigator.Screen name="SlideOne" component={SlideOne} />
      <StackNavigator.Screen name="SlideTwo" component={SlideTwo} />
    </StackNavigator.Navigator>
  </NavigationContainer>;
}

export default App;

Answer 1

您的 index.js 文件不正确，只需将 index.js 文件替换为此

import 'react-native-gesture-handler';
import {NavigationContainer} from '@react-navigation/native';
import {createStackNavigator} from '@react-navigation/stack';
import {AppRegistry} from 'react-native';
import App from './App';
import {name as appName} from './app.json';
AppRegistry.registerComponent(appName, () => App);

您应该将 App 注册为AppRegistry组件，而不是在注册 SlideOne

Answer 2

您没有初始化“导航”常量。尝试这个： -从@ react-navigation / native

导入useNavigation

$dayNames = array_map(function ($e) {
    return jddayofweek($e - 1, 1);
}, $dayNumbers);

然后像这样初始化导航常量

const navigation = useNavigation（）;

如何解决本机Navigation.navigate错误

2 个答案: