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 background
console.log('App is in the background');
isBackgndRef.current = true
timeoutId = setTimeout(() => {
checkCondition();
}, 20000);
// You can perform any background-related tasks here
} else if (nextAppState === 'active') {
// Your app is transitioning to the foreground
console.log('App is in the foreground');
// You can perform any foreground-related tasks here
if (isBackgndRef.current == true) {console.log("checking");
clearTimeout(timeoutId);
isBackgndRef.current = false;
}
}
}
// Add the event listener when the component mounts
AppState.addEventListener('change', handleAppStateChange);
// Clean up the event listener when the component unmounts
return () => {
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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