How to send data back to previous sceen when using

问题:

I've got screen 1 from which I navigate to screen 2 using:

navigation.navigate('Screen2')

From this screen, I would like to go to the previous one, which simple:

navigation.goBack()

However I'm wondering how can I pass some data back to Screen1? Something like wouldn't work navigation.goBack({ myData: 'something' }) so I'm wondering what is the recommended way to do this in general?

回答1:

You can solve it with 2 ways :

1 : Using navigation method

Pass a method when you are calling that screen through navigation :

this.props.navigation.navigate('Screen2', {
  onGoBack: this.refresh,
});

refresh=(data)=> {

}

and when you press back, pass data like

this.props.navigation.state.params.onGoBack('123');
this.props.navigation.goBack();

2 : Using redux store

If you are using redux in your application, just update redux store whenever user presses back button, and get store value in previous screen.

回答2:

You can pass a callback (onSelect) like this:

// SCREEN 1
import React from "react";
import { Button, Text, View } from "react-native";

class Screen1 extends React.Component {
  state = { selected: false };

  onSelect = data => {
    this.setState(data);
  };

  onPress = () => {
    this.props.navigate("Screen2", { onSelect: this.onSelect });
  };

  render() {
    return (
      <View>
        <Text>{this.state.selected ? "Selected" : "Not Selected"}</Text>
        <Button title="Next" onPress={this.onPress} />
      </View>
    );
  }
}

// SCREEN 2
import React from "react";
import { Button } from "react-native";

class Screen2 extends React.Component {
  goBack() {
    const { navigation } = this.props;
    navigation.goBack();
    navigation.state.params.onSelect({ selected: true });
  }

  render() {
    return <Button title="back" onPress={this.goBack} />;
  }
}

回答3:

if you're using v2 or newer, another possibility is using the navigate function, providing key / routeName of the route you're going back to and the params. docs: https://reactnavigation.org/docs/en/navigation-actions.html#navigate