How to get real time battery level on iOS with a 1% granularity

Question

I'm using this function to get current battery level of device:

[[UIDevice currentDevice] setBatteryMonitoringEnabled:YES];
UIDevice *myDevice = [UIDevice currentDevice];

[myDevice setBatteryMonitoringEnabled:YES];
double batLeft = (float)[myDevice batteryLevel]; 
NSLog(@"%f",batLeft);

but the result has a 5% granularity. Example: when the phone battery is at 88%, it only logs a value of 0.85. batteryLevel only returns values in increments of 0.05. For example: 0.85, 0.9, 0.95 and never returns values like 0.82 or 0.83.

Is there any solution to get a percentage with a higher precision?

Answer 1

check out this site : Reading the battery level programmatically

but, carefully use. all of the APIs used here are undocumented on the iPhone, and will probably lead to a rejection if you submit this application to the App Store. Although battery charge status is not exactly, I'd recommend using the UIDevice battery monitoring methods.

Answer 2

There are at least four different ways to read the battery level, and all four ways may return different values.

Here is a chart of these values through time.

The values were recorded with this iOS project: https://github.com/nst/BatteryChart

Please check out the code for reference.

Answer 3

UIDevice *myDevice = [UIDevice currentDevice];    
[myDevice setBatteryMonitoringEnabled:YES];

double batLeft = (float)[myDevice batteryLevel] * 100;
NSLog(@"%.f", batLeft);    

NSString * levelLabel = [NSString stringWithFormat:@"%.f%%", batLeft];    
lblLevel.text = levelLabel;

Answer 4

Swift version to get the battery level:

UIDevice.current.isBatteryMonitoringEnabled = true
let batteryLevel = UIDevice.current.batteryLevel 

batteryLevel return 0,39; 0,40 values for me.

Answer 5

The answers above are very good, but they are all in Obj-C, I have used these with other examples to do the same task on MonoTouch, so I am putting my code here in case anybody needs it:

try
{
    UIDevice.CurrentDevice.BatteryMonitoringEnabled = true;
    _Battery.Level = (int)(UIDevice.CurrentDevice.BatteryLevel * IOSBatteryLevelScalingFactor);
    _Battery.State = UIDevice.CurrentDevice.BatteryState;
}
catch (Exception e)
{
    ExceptionHandler.HandleException(e, "BatteryState.Update");
    throw new BatteryUpdateException();
}
finally
{
    UIDevice.CurrentDevice.BatteryMonitoringEnabled = false;
}

I also have a full post on my blog to give all the details in here

Answer 6

You can find a perfect answer here

Xcode: 11.4 Swift: 5.2

Click Here

Answer 7

If you are using swift 5.1 or greater this code will definitely work for you.

Step 1:- To get started, first enable the isBatteryMonitoringEnabled property of the current device, like this:-

UIDevice.current.isBatteryMonitoringEnabled = true

Step 2:- You can now read the current battery level

let level = UIDevice.current.batteryLevel
print(level)