英文:
How to execute a function after 1minute of the app goes to the background in react-native
问题
我想在 React Native 中实现一个功能，在应用程序在后台停留1分钟后，同时改变状态和导航。我已经使用了我的代码，但它没有起作用。
useEffect(() => {let timeoutId;const handleAppStateChange = (nextAppState) => {// nextAppState 可能是 'active', 'background', 或 'inactive'if (nextAppState === 'background') {// 应用程序正在切换到后台console.log('应用程序在后台');isBackgndRef.current = true;timeoutId = setTimeout(() => {checkCondition();}, 20000);// 在这里可以执行任何与后台相关的任务} else if (nextAppState === 'active') {// 应用程序正在切换到前台console.log('应用程序在前台');// 在这里可以执行任何与前台相关的任务if (isBackgndRef.current == true) {console.log("检查中");clearTimeout(timeoutId);isBackgndRef.current = false;}}}// 组件挂载时添加事件监听器AppState.addEventListener('change', handleAppStateChange);// 组件卸载时清除事件监听器return () => {AppState.removeEventListener('change', handleAppStateChange);clearTimeout(timeoutId);console.log("返回调用");};}, []);
英文:
I want to execute a function and changing state along with navigation change when the app goes to the background after 1 minute of it in react native, i have used my code but it does not working..
useEffect(() => {let timeoutId;const handleAppStateChange = (nextAppState) => {// nextAppState can be 'active', 'background', or 'inactive'if (nextAppState === 'background') {// Your app is transitioning to the backgroundconsole.log('App is in the background');isBackgndRef.current = truetimeoutId = setTimeout(() => {checkCondition();}, 20000);// You can perform any background-related tasks here} else if (nextAppState === 'active') {// Your app is transitioning to the foregroundconsole.log('App is in the foreground');// You can perform any foreground-related tasks hereif (isBackgndRef.current == true) {console.log("checking");clearTimeout(timeoutId);isBackgndRef.current = false;}}}// Add the event listener when the component mountsAppState.addEventListener('change', handleAppStateChange);// Clean up the event listener when the component unmountsreturn () => {AppState.removeEventListener('change', handleAppStateChange);clearTimeout(timeoutId); console.log("return called");};}, []);
答案1
得分: 1
对于后台应用程序状态，请使用react-native-background-timer插件中的setTimeout()，而不是react-native的setTimeout()。
使用以下链接找到react-native-background-timer插件：
https://www.npmjs.com/package/react-native-background-timer
英文:
For the background app state, please use setTimeout() from the
react-native-background-timer plugin instead of react-native setTimout().
Use the following link to find the react-native-background-timer plugin:
https://www.npmjs.com/package/react-native-background-timer
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