ComponentDidCatch不起作用

Question

为什么componentDidCatch在我的react-native应用程序中不起作用. componentDidCatch不处理错误.

React native v: 50.3
React: 16.0.0

import React, {Component} from 'react';
import {View, Text}        from 'react-native';
import Logo               from './SignUpInit/Logo';
import SignUp             from './SignUpInit/SignUp';
import Social             from './SignUpInit/Social';
import styles             from './SignUpInit/styles';

export default class SignUpInit extends Component {

    state = {
        componentCrashed: false,
        count: 0,
    }

    componentDidCatch(error, info) {
        console.log(error);
        console.log(info);
        console.log('_______DID CATCH____________');
        this.setState({componentCrashed: true});
    }

    componentDidMount(){
        setInterval(()=>this.setState({count: this.state.count+1}),1000);
    }

    render() {
        if (this.state.componentCrashed) {
            return (
                <View>
                    <Text>
                        Error in component "SingUpInit"
                    </Text>
                </View>
            );
        }

        if(this.state.count > 5){
            throw new Error('Error error error');
        }


        return (
            <View style={styles.main}>
                <Logo/>
                <SignUp/>
                <Social/>
            </View>
        );
    }
}

Answer 1

这不起作用,因为componentDidCatch()仅用于捕获组件子项抛出的错误.在这里,您似乎正在尝试捕获由同一组件抛出的错误 - 这不会起作用.

有关详细信息,请参阅官方文档:

错误边界是React组件,它们在其子组件树中的任何位置捕获JavaScript错误,记录这些错误,并显示回退UI而不是崩溃的组件树.

请注意"子组件树中的任何位置".

因此,您需要做的就是将组件包装在另一个管理所有错误的组件中.就像是:

<ErrorBoundary>
  <SignUpInit />
</ErrorBoundary>

<ErrorBoundary />简单的地方在哪里:

class ErrorBoundary extends React.Component {
  constructor(props) {
    super(props);
    this.state = {hasError: false};
  }

  componentDidCatch(error, info) {
    this.setState({hasError: true});
  }

  render() {
    if(this.state.hasError) return <div>Error!</div>;
    return this.props.children;
  }
}