创建带有导航字段的新组件 [英] Creation of a new component with navigation fields

问题描述

我尝试创建一个包含两个按钮的新 react-native 组件.我定义了两个属性 next 进入下一页和 prev 进入前一页，但我有这个错误:

I try to create a new react-native component that contains two button. I define two property next to going on the next page and prev to going in the precedent page but I have this error:

undefined 不是一个对象(评估 '_this.props.navigation.navigate')

undefined is not an object (evaluating '_this.props.navigation.navigate')

我发现了很多类似的问题，但我没有找到任何有效的解决方案.

I found so much question similar this but I don't found any valid solution.

这是代码:

import PropTypes from 'prop-types'
import React, { Component } from 'react';
import { View, StyleSheet, Button } from 'react-native';

export default class ButtonNavigation extends Component {

  static propTypes = {
    next: PropTypes.string,
    prev: PropTypes.string,
  }

  render() {

    const { next, prev } = this.props;

    return (
      <View style={styles.bottomContainer}>
        <View style={styles.buttonContainer}>
          <Button onPress={() => this.props.navigation.navigate(next)} title='Indietro' color='#00b0ff'/>
        </View>
        <View style={styles.buttonContainer}>
          <Button onPress={() => this.props.navigation.navigate(prev)} title='Avanti' color='gold'/>
        </View>
      </View>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    alignItems: 'center',
    justifyContent: 'center'
  },
  bottomContainer: {
    flex: 1,
    flexDirection: 'row',
    position: 'absolute',
    bottom: 10,
    padding: 20,
    justifyContent: 'space-between'
  },
  text: {
    fontSize: 30,
  },
  buttonContainer: {
    flex: 1,
    padding: 20,
    justifyContent: 'center',
    alignContent: 'center',
  }
});

我以这种方式将对象包含在另一个页面中:

I include the object in the other page in this way:

<ButtonNavigation next={'NumberVehicle'} prev={'Home'}/>

推荐答案

在你的<ButtonNavigation next={'NumberVehicle'} prev={'Home'}/> 你需要添加导航对象作为道具.所以像:

In your <ButtonNavigation next={'NumberVehicle'} prev={'Home'}/> you need to add the navigation object as a prop. So something like:

<ButtonNavigation
  next={'NumberVehicle'}
  prev={'Home'}
  navigation={this.props.navigation} 
/>

(如果与实际导航对象不同，请确保替换this.props.navigation)

(Make sure to replace this.props.navigation if it differs from the actual navigation object)

然后你可以:

const { next, prev, navigation } = this.props;

和

navigation.navigate(..)

这篇关于创建带有导航字段的新组件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！