如何获得正确的电池电量和电池状态-ios？

Question

始终[myDevice batteryLevel]返回-1并[myDevice batterystate]返回0(进入默认情况).

我怎样才能得到正确的值？.任何人都可以帮我解决这个问题吗？.Below是我的代码.(始终将batteryLeft打印为"-100%",电池状态为"未知").

码:

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);

Answer 1

你的代码看起来没问题,就像我在我的应用程序中使用的一样:

-(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);
}

您的问题可能是您在模拟器中尝试此操作,它无法正常工作.

试试一个真实的设备.