如何获取iPhone电池的状态和当前的电量

- (void)batteryMoniter {    UIDevice *device = [UIDevice currentDevice];    device.batteryMonitoringEnabled = YES;    if (device.batteryState == UIDeviceBatteryStateUnknown) {        NSLog(@"UnKnow");    }else if (device.batteryState == UIDeviceBatteryStateUnplugged){        NSLog(@"Unplugged");    }else if (device.batteryState == UIDeviceBatteryStateCharging){        NSLog(@"Charging");    }else if (device.batteryState == UIDeviceBatteryStateFull){        NSLog(@"Full");    }       NSLog(@"%f",device.batteryLevel);}NSLog(@"%f",device.batteryLevel);//简单的这句就是了。＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃Having said that, I would not use a timer event for this, it is pretty inefficient. You want to use KVO instead:- (void) viewWillAppear:(BOOL)animated {  UIDevice *device = [UIDevice currentDevice];  device.batteryMonitoringEnabled = YES;  currentCharge.text = [NSString stringWithFormat:@"%.2f", device.batteryLevel];  [device addObserver:self forKeyPath:@"batteryLevel" options:0x0 context:nil];  [super viewWillAppear:animated];}- (void) viewDidDisappear:(BOOL)animated {  UIDevice *device = [UIDevice currentDevice];  device.batteryMonitoringEnabled = NO;  [device removeObserver:self forKeyPath:@"batteryLevel"];  [super viewDidDisappear:animated];}- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {  UIDevice *device = [UIDevice currentDevice];  if ([object isEqual:device] && [keyPath isEqual:@"batteryLevel"]) {    currentCharge.text = [NSString stringWithFormat:@"%.2f", device.batteryLevel];  }}