ios UIDeviceBattery【電池的狀態處理：電池狀態獲取及監測、電池電量獲取及監測、低電量模式切換監測】

前言 需求：電量低於 <= 50 %進行報警 name:NSProcessInfoPowerStateDidChangeNotificationweb UIDeviceBatteryLevelDidChangeNotificationsvg [[NSNotificationCenter defaultCenter] addObserverForName:UIDeviceBatteryLe

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