iOS does not detect when user manually switches to low power mode

I am using v5.6.1 I want to detect if user triggered power save on device. I thought that this would work but this triggers on power cable in. Is there any other way to get lowPowerMode only when suer change this phone settings?

import { NativeEventEmitter, NativeModules } from 'react-native'
const deviceInfoEmitter = new NativeEventEmitter(NativeModules.RNDeviceInfo);
async componentDidMount() {
this.batteryListener = deviceInfoEmitter.addListener('RNDeviceInfo_powerStateDidChange', status => {
      // {batteryState: "charging", batteryLevel: 0.75, lowPowerMode: true}
});

[mikehardy]

Oh! You are right, looks like we might be missing something here

https://github.com/react-native-community/react-native-device-info/blob/2dea0575e892466c3ddc0965fafb2252f2466497/ios/RNDeviceInfo/RNDeviceInfo.m#L78-L89

Specifically something like

https://developer.apple.com/library/archive/documentation/Performance/Conceptual/EnergyGuide-iOS/LowPowerMode.html

    [[NSNotificationCenter defaultCenter] addObserver:self
       selector: @selector(yourMethodName:)
       name: NSProcessInfoPowerStateDidChangeNotification
       object: nil];

I am happy to merge a PR that does this, it should be a quick hack - go after it directly in node_modules to develop + test it by hooking that and emitting a new powerStateDidChange event, when you get it working use https://github.com/ds300/patch-package (fantastic! if you’ve never seen it) so that your fix never stops working for you, and submit the change as a PR, I can do a release quickly just no time for the testing (that’s the part that really takes the time, IMHO)

[mikehardy]

I welcome PRs, and will merge and release reasonable solutions