Access battery info (current, remaining charge, cycle count etc) in Swift

battstat.swift

//
//  main.swift
//  battstat
//
//  Created by Michael Herring on 2015/09/14.
//  Copyright (c) 2015年 Michael Herring. All rights reserved.
//

import Foundation
import IOKit.ps
import IOKit.pwr_mgt

//get power sources array
let powerSourcesInfo : AnyObject! = IOPSCopyPowerSourcesInfo().takeUnretainedValue()
let batteryArray : NSArray = IOPSCopyPowerSourcesList(powerSourcesInfo).takeUnretainedValue()

//get power management object
let nullPort : UInt32 = UInt32(MACH_PORT_NULL)
let powerManagement : io_connect_t = IOPMFindPowerManagement(nullPort)

//get power management battery info array
let batteryInfoPtr : UnsafeMutablePointer<Unmanaged<CFArray>?> = UnsafeMutablePointer.alloc(sizeof(Unmanaged<CFArray>?))
let batteryResult:IOReturn = IOPMCopyBatteryInfo(nullPort, batteryInfoPtr)
let batteryInfo:NSArray? = batteryInfoPtr.memory?.takeUnretainedValue()

//close service
IOServiceClose(powerManagement)

//output data
var batteryIndex:Int = 0
for nextSource in batteryArray
{
	print("Battery "+String(batteryIndex)+" Status:")
	print(nextSource)
	let pmBatteryPtr:UnsafePointer<Void> = CFArrayGetValueAtIndex(batteryInfo, batteryIndex++)
	let pmBattery:Dictionary = unsafeBitCast(pmBatteryPtr, CFDictionary.self) as Dictionary
	print(pmBattery)
}