使用navigation.goBack()时,如何将数据发送回上一个sceen?

有两种方法可以解决:

1:使用导航方法

通过导航调用该屏幕时传递方法:

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

refresh=(data)=> {

}

当你按back键时,像这样传递数据

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

如果您在应用程序中使用redux,只要在用户按下back按钮时更新redux store,就可以在上一个屏幕中获得store值。

// 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} />;
  }
}

如果您使用的是v2或更高版本,另一种可能是使用 navigate 功能,提供 key routeName 你要返回的路线和 params . 文件: https://reactnavigation.org/docs/en/navigation-actions.html#navigate