Xcode- Alert if iPhone not charging - Stack Overflow

You want to put the

[[UIDevice currentDevice] setBatteryMonitoringEnabled:YES];

when your app activates. (appDidBecomeActive)

(maybe turn it off when the app deactivates)

But before you enable the monitoring, you have to subscribe to the

UIDeviceBatteryStateDidChangeNotification

from the UIDevice singleton.

[[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(batteryStateDidChange:)
                                                 name:UIDeviceBatteryStateDidChangeNotification object:nil];

@selector points to the method that will handle whatever you want to do when the state changes.

Source:

http://stackoverflow.com/questions/14028103/xcode-alert-if-iphone-not-charging

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