On my Android device, I've noticed that when I exit the application using the hardware back button, the componentWillUnmount function is triggered. However, if I use the square button to show the list of running apps and swipe to close it, the function does not get called.
Is there a way to detect when the app is being closed in order to clear timers, save data, etc.?
Appreciate any suggestions. Thank you.
For guidance on recognizing if the current state is in the foreground or active, explore the AppState Api. https://facebook.github.io/react-native/docs/appstate.html
Encountering a similar issue, I found a different approach to address it. Rather than adding an event listener to stateChange, I opted to simply check AppState.currentState within the componentDidMount() method.
The root of the problem stemmed from the event listeners being properly added upon component mounting but failing to detach during componentWillUnmount.
If you're utilizing react-navigation version 4.x, you can implement the following code snippet sourced from another location. It's anticipated that this issue will be rectified in react-navigation version 5.x.
componentDidMount() {
const {navigation} = this.props;
this.focusListener = navigation.addListener('didFocus', () => {
const focused = navigation.isFocused();
if (focused) {
console.log('mount');
}
});
this.blurListener = navigation.addListener('willBlur', () => {
console.log('unmount');
});
}
componentWillUnmount() {
this.focusListener.remove();
this.blurListener.remove();
}
If you need to customize the functionality of a hardware button, you can specify conditions within the code. For instance, in React Native Router Flux, you could use a condition such as Actions.currentScene === 'Home' to trigger a specific action when on the home screen. Feel free to add any other conditions that suit your requirements.
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