React-Native -从子方法调用父方法

// 父组件
import React, { Component } from 'react';
import { View } from 'react-native';
import ChildComponent from './ChildComponent';

class ParentComponent extends Component {
  constructor(props) {
    super(props);
    this.state = {
      message: ''
    };
  }

  handleChildMethod = (message) => {
    this.setState({ message });
  }

  render() {
    return (
      <View>
        <ChildComponent onChildMethod={this.handleChildMethod} />
        <Text>{this.state.message}</Text>
      </View>
    );
  }
}

export default ParentComponent;

// 子组件
import React, { Component } from 'react';
import { Button } from 'react-native';

class ChildComponent extends Component {
  handlePress = () => {
    const message = 'Hello from child component!';
    this.props.onChildMethod(message);
  }

  render() {
    return (
      <Button onPress={this.handlePress} title="Call Parent Method" />
    );
  }
}

export default ChildComponent;