Some device details (requires iOS 8.0.0 or later).

deviceDetails.swift

import Foundation

// Is the device's iOS version equal or later to the targeted version?
let targetOSVersion = NSOperatingSystemVersion(majorVersion:8, minorVersion:0, patchVersion:0)
if NSProcessInfo().isOperatingSystemAtLeastVersion(targetOSVersion) {
    println("Running iOS version 8.0.0 or later.")
} else {
    println("Running iOS version 7 or earlier.")
}

// What version of iOS is this device running?
let osVersion = NSProcessInfo().operatingSystemVersion
println("Current iOS version: \(osVersion.majorVersion).\(osVersion.minorVersion).\(osVersion.patchVersion).")
// ...or...
println(NSProcessInfo().operatingSystemVersionString)

// How much RAM memory is available?
println("Total RAM memory: \(NSProcessInfo().physicalMemory / 1048576) MB.")

// What is the name of this device?
println("Computer ID: \(NSProcessInfo().hostName).")

// How much file space is available on this device?
let system = NSFileManager.defaultManager().attributesOfFileSystemForPath(NSHomeDirectory() as String, error: nil)
let totalFileSpace = system?[NSFileSystemSize] as! Int
let freeFileSpace  = system?[NSFileSystemFreeSize] as! Int
println("Total file space: \(totalFileSpace / 1048576) MB.")
println("Free file space:  \(freeFileSpace / 1048576) MB.")