ios 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】

前言 需求：电量低于 <= 50 %进行报警 name:NSProcessInfoPowerStateDidChangeNotificationweb UIDeviceBatteryLevelDidChangeNotificationsvg [[NSNotificationCenter defaultCenter] addObserverForName:UIDeviceBatteryLe

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