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iOS Battery Level

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First we need enable battery monitoring to get Battery Level & Battery Status

UIDevice.current.isBatteryMonitoringEnabled = true

Battery level ranges from 0.0 (fully discharged) to 1.0 (100% charged)

To get the Battery Level

var batteryLevel: Float { UIDevice.current.batteryLevel }

You can add observer to monitor Battery Level continuously.

NotificationCenter.default.addObserver(self, selector: #selector(batteryLevelDidChange), name: UIDevice.batteryLevelDidChangeNotification, object: nil)

//MARK:- Get Battery Level
@objc func batteryLevelDidChange(_ notification: Notification) {
    print("\(Int(batteryLevel * 100))%")
}

Ref: Apple Document - Battery Level

You can also verify the battery power state of the device

var batteryState: UIDevice.BatteryState { UIDevice.current.batteryState }

Overview:

Enumeration constants are used by the batteryState property

  • case .unknown

    The battery state for the device cannot be determined

    • case .unplugged

    The battery is discharging

  • case .charging

    The device is plugged into power & the battery is less than 100% charged

    • case . full

    The device is plugged into power and the battery is 100% charged

You can add observer to monitor Battery State continuously.

NotificationCenter.default.addObserver(self, selector: #selector(batteryStateDidChange), name: UIDevice.batteryStateDidChangeNotification, object: nil)

//MARK:- Get Battery State
@objc func batteryStateDidChange(_ notification: Notification) {
    switch batteryState {
        case .unplugged, .unknown:
            print("Not charging")
        case .charging:
            print("Charging")
        case .full:
            print("Full")
        @unknown default:
            print("Nothing")
    }
}

Ref: Apple Document - Battery State

Sample:

Image

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