前言
电量低于 <= 50 %进行报警
name:NSProcessInfoPowerStateDidChangeNotification
UIDeviceBatteryLevelDidChangeNotification
[[NSNotificationCenter defaultCenter] addObserverForName:UIDeviceBatteryLevelDidChangeNotification object:nil queue:[NSOperationQueue mainQueue] usingBlock:^(NSNotification *notification) { // Level has changed [UIDevice currentDevice].batteryMonitoringEnabled = YES; NSLog(@"Battery Level Change"); NSLog(@"电池电量：%.2f", [UIDevice currentDevice].batteryLevel); }];UIDeviceBatteryStateDidChangeNotification
一、电池状态获取及监测
code
#pragma mark - 电池状态获取及监控 -(void)checkAndMonitorBatteryState{ UIDevice * device = [UIDevice currentDevice]; //是否允许监测电池 //要想获取电池状态和监控电池状态 必须允许 device.batteryMonitoringEnabled = true; //1、check /* 电池状态 typedef NS_ENUM(NSInteger, UIDeviceBatteryState) { UIDeviceBatteryStateUnknown, UIDeviceBatteryStateUnplugged, // on battery, discharging UIDeviceBatteryStateCharging, // plugged in, less than 100% UIDeviceBatteryStateFull, // plugged in, at 100% } __TVOS_PROHIBITED; */ UIDeviceBatteryState state = device.batteryState; NSArray *stateArray = [NSArray arrayWithObjects:@"未开启监视电池状态",@"电池未充电状态",@"电池充电状态",@"电池充电完成",nil]; NSLog(@"电池状态：%@", [stateArray objectAtIndex:state]); //2、monitor [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didChangBatteryState:) name:@"UIDeviceBatteryStateDidChangeNotification" object:device]; } -(void)didChangBatteryState:(NSNotification *)notification{ //电池状态发生改变时调用 }
二、电池电量获取及监测
UIDeviceBatteryLevelDidChangeNotification
#pragma mark - 电池电量获取及监控 -(void)checkAndMonitorBatteryLevel{ //拿到当前设备 UIDevice * device = [UIDevice currentDevice]; //是否允许监测电池 //要想获取电池电量信息和监控电池电量 必须允许 device.batteryMonitoringEnabled = true; //1、check /* 获取电池电量 0 .. 1.0. -1.0 if UIDeviceBatteryStateUnknown */ float level = device.batteryLevel; NSLog(@"level = %lf",level); //2、monitor [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didChangeBatteryLevel:) name:@"UIDeviceBatteryLevelDidChangeNotification" object:device]; } - (void)didChangeBatteryLevel:(id)sender{ //电池电量发生改变时调用 UIDevice *myDevice = [UIDevice currentDevice]; [myDevice setBatteryMonitoringEnabled:YES]; float batteryLevel = [myDevice batteryLevel]; NSLog(@"电池剩余比例：%@", [NSString stringWithFormat:@"%f",batteryLevel*100]); }
三、低电量模式切换监测
isLowPowerModeEnabled
#pragma mark - 低电量模式切换 -(void)checkAndMonitorPowerMode{ //1、check //是否处于低电量模式 if ([[NSProcessInfo processInfo] isLowPowerModeEnabled]) { NSLog(@"处在低电量模式"); } else{ NSLog(@"未处于低电量模式"); } //2、monitor //低电量模式切换通知 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didChangePowerMode:) name:NSProcessInfoPowerStateDidChangeNotification object:nil]; } //收到低电量通知之后调用的方法 //PS:手动设置低电量模式时，程序会回到后台，当程序从后台回到前台时就会调用该方法 - (void)didChangePowerMode:(NSNotification *)notification { if ([[NSProcessInfo processInfo] isLowPowerModeEnabled]) { NSLog(@"打开低电量模式"); } else { NSLog(@"关闭低电量模式"); }
Q&A
如果使用` dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
});
的时候，在这里创建使用` [[NSRunLoop currentRunLoop] addTimer:_batteryLevelT forMode:NSRunLoopCommonModes];` 的时候，很可能定时器没有权限执行。
解决方案: 使用dispatch_get_main_queue()
dispatch_async(dispatch_get_main_queue(), ^{ [self checkAndMonitorBatteryLevel]; });
See Also
/Users/devzkn/bin//knpost UIDeviceBattery 电池的状态处理：电池状态获取及监测、电池电量获取及监测、低电量模式切换监测 -t objc #原来""的参数，需要自己加上""
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