How to get correct battery level and battery status-ios?

Question

Always [myDevice batteryLevel] returning -1 and [myDevice batterystate]returning 0(entering into Default case).

How can i get the correct values?.Can anyone please help me to solve this?.Below is my code.(Always Printing batteryLeft as "-100%" and Battery Status as "Unknown").

Code:

UIDevice *myDevice = [UIDevice currentDevice];
[myDevice setBatteryMonitoringEnabled:YES];
float batLeft = [myDevice batteryLevel]*100;
int status=[myDevice batteryState];
NSLog(@"level:%0.0f",batLeft);
NSString *status_str;
switch (status)
{
    case UIDeviceBatteryStateUnplugged:
    {
        NSLog(@"UnpluggedKey");
        status_str=@"UnPlugged";
        break;
    }
    case UIDeviceBatteryStateCharging:
    {
        NSLog(@"ChargingKey");
        status_str=@"Charging";
        break;
    }
    case UIDeviceBatteryStateFull:
    {
        NSLog(@"FullKey");
        status_str=@"BatteryFul";
        break;
    }

default:
{
    NSLog(@"UnknownKey");
    status_str=@"Unknown";
    break;
}
}
NSLog(@"Battery status:%@",status_str);

Amethyst

Are you testing on device or simulator? testing on simulator will give you the output that your are getting now. :-) – Tarahtaran

Answer 1

Your code looks to be ok, it's the same that I used in one of my app:

-(void) battery
{
    UIDevice *myDevice = [UIDevice currentDevice];
    [myDevice setBatteryMonitoringEnabled:YES];

    int state = [myDevice batteryState];
    NSLog(@"battery status: %d",state); // 0 unknown, 1 unplegged, 2 charging, 3 full

    double batLeft = (float)[myDevice batteryLevel] * 100;
    NSLog(@"battery left: %ld", batLeft);
}

Your problem can be that you try this in the simulator, where it can't be work.

Try on one real device.

Buddie

How is this code any different than what is already in the question? Please explain how this solves the issue. – Charity

Answer 2

I hope you are not checking it on your simulator :)

You will not get exact battery level of your device , its always in multiple of 0.05. That means if your device battery level is 78% then it will show 75%.

if you want exact battery level indication then you can follow this link :http://blog.coriolis.ch/2009/02/14/reading-the-battery-level-programmatically/

Shwalb