如何检测React Native应用何时关闭(未暂停)?

问题描述

我到处都是，找不到答案.如何检测用户何时试图关闭我的React Native应用程序(因为该进程正在运行，并且他们手动管理其应用程序并强制退出该应用程序).我想在发生这种情况时添加注销功能，但是找不到检测它的方法. AppState似乎仅用于检测应用何时进入后台或退出后台.

I have looked everywhere and cannot find an answer to this. How can I detect when a user is trying to close my React Native app (as in the process is running, and they manually manage their apps and force exit it). I would like to add logout functionality when this happens, however cannot find a way to detect it. AppState appears to only detect when the app is brought in and out of the background.

推荐答案

看起来您可以检测到上一个状态并将其与下一个状态进行比较.根据我在网上可以找到的内容，您无法检测到该应用程序正在关闭还是进入后台，但是您可以检测到该应用程序是inactive(关闭)还是在background中.

Looks like you can detect the previous state and compare it to the next state. You can't detect that the app is closing vs going into the background, from what I can find online, but you can detect if it was inactive (closed), or in the background.

import React, {Component} from 'react'
import {AppState, Text} from 'react-native'

class AppStateExample extends Component {

  state = {
    appState: AppState.currentState
  }

  componentDidMount() {
    AppState.addEventListener('change', this._handleAppStateChange);
  }

  componentWillUnmount() {
    AppState.removeEventListener('change', this._handleAppStateChange);
  }

  _handleAppStateChange = (nextAppState) => {
    if (this.state.appState.match(/inactive|background/) && nextAppState === 'active') {
      console.log('App has come to the foreground!')
    }
    this.setState({appState: nextAppState});
  }

  render() {
    return (
      <Text>Current state is: {this.state.appState}</Text>
    );
  }

}

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