How to check the battery level of your iOS device?
We can use the batteryLevel property of the UIDevice class for this. It will return a float:
float myFloat = [[UIDevice currentDevice] batteryLevel];
If you’d like to print this in a UILabel you’ll have to convert it into a String Object like so:
self.myLabel.text = [NSString stringWithFormat:@"%f", myFloat];
For this to work battery monitoring needs to be enabled, perhaps in the viewDidLoad method. Otherwise the returned value will be -1.0:
[[UIDevice currentDevice] setBatteryMonitoringEnabled:YES];