React Native 檢測用戶何時嘗試退出應用程序？

Question

I want to update my redux state based on the component unmount but in case a user terminates the app how to detect that and update my redux state based on the app termination as the componentWillUnmount will not be called in case of quitting the app. 有沒有辦法在本機反應中檢測應用程序終止（未暫停）？

Answer 1

我猜你的困惑應該通過理解以下方法來消除：

 import React from "react"; export default class Clock extends React.Component { constructor(props) { console.log("Clock", "constructor"); super(props); this.state = { date: new Date() }; } tick() { this.setState({ date: new Date() }); } // These methods are called "lifecycle hooks". componentDidMount() { console.log("Clock", "componentDidMount"); this.timerID = setInterval(() => { this.tick(); }, 1000); } // These methods are called "lifecycle hooks". componentWillUnmount() { console.log("Clock", "componentWillUnmount"); clearInterval(this.timerID); } render() { return ( <div>It is {this.state.date.toLocaleTimeString()}.</div> ); } }