UIDevice Swift extension to determine the device an app is running on

UIDevice.swift

import Foundation
import UIKit

public enum Model: String {
    case simulator   = "simulator/sandbox",
    iPod1            = "iPod 1",
    iPod2            = "iPod 2",
    iPod3            = "iPod 3",
    iPod4            = "iPod 4",
    iPod5            = "iPod 5",
    iPad2            = "iPad 2",
    iPad3            = "iPad 3",
    iPad4            = "iPad 4",
    iPhone4          = "iPhone 4",
    iPhone4S         = "iPhone 4S",
    iPhone5          = "iPhone 5",
    iPhone5S         = "iPhone 5S",
    iPhone5C         = "iPhone 5C",
    iPadMini1        = "iPad Mini 1",
    iPadMini2        = "iPad Mini 2",
    iPadMini3        = "iPad Mini 3",
    iPadMini4        = "iPad Mini 4",
    iPadAir1         = "iPad Air 1",
    iPadAir2         = "iPad Air 2",
    iPadPro9_7       = "iPad Pro 9.7\"",
    iPadPro9_7_cell  = "iPad Pro 9.7\" cellular",
    iPadPro10_5      = "iPad Pro 10.5\"",
    iPadPro10_5_cell = "iPad Pro 10.5\" cellular",
    iPadPro12_9      = "iPad Pro 12.9\"",
    iPadPro12_9_cell = "iPad Pro 12.9\" cellular",
    iPhone6          = "iPhone 6",
    iPhone6plus      = "iPhone 6 Plus",
    iPhone6S         = "iPhone 6S",
    iPhone6Splus     = "iPhone 6S Plus",
    iPhoneSE         = "iPhone SE",
    iPhone7          = "iPhone 7",
    iPhone7plus      = "iPhone 7 Plus",
    iPhone8          = "iPhone 8",
    iPhone8plus      = "iPhone 8 Plus",
    iPhoneX          = "iPhone X",
    unrecognized     = "?unrecognized?"
}

public extension UIDevice {
    
    
    private var modelCode: String? {
        
        var systemInfo = utsname()
        uname(&systemInfo)
        let modelCode = withUnsafePointer(to: &systemInfo.machine) {
            $0.withMemoryRebound(to: CChar.self, capacity: 1) { ptr in
                String.init(validatingUTF8: ptr)
            }
        }
        return modelCode
    }
    
    
    public var type: Model {

        var modelMap : [ String : Model ] = [
            "i386": .simulator,
            "x86_64": .simulator,
            "iPod1,1": .iPod1,
            "iPod2,1": .iPod2,
            "iPod3,1": .iPod3,
            "iPod4,1": .iPod4,
            "iPod5,1": .iPod5,
            "iPad2,1": .iPad2,
            "iPad2,2": .iPad2,
            "iPad2,3": .iPad2,
            "iPad2,4": .iPad2,
            "iPad2,5": .iPadMini1,
            "iPad2,6": .iPadMini1,
            "iPad2,7": .iPadMini1,
            "iPhone3,1": .iPhone4,
            "iPhone3,2": .iPhone4,
            "iPhone3,3": .iPhone4,
            "iPhone4,1": .iPhone4S,
            "iPhone5,1": .iPhone5,
            "iPhone5,2": .iPhone5,
            "iPhone5,3": .iPhone5C,
            "iPhone5,4": .iPhone5C,
            "iPad3,1": .iPad3,
            "iPad3,2": .iPad3,
            "iPad3,3": .iPad3,
            "iPad3,4": .iPad4,
            "iPad3,5": .iPad4,
            "iPad3,6": .iPad4,
            "iPhone6,1": .iPhone5S,
            "iPhone6,2": .iPhone5S,
            "iPad4,1": .iPadAir1,
            "iPad4,2": .iPadAir2,
            "iPad4,4": .iPadMini2,
            "iPad4,5": .iPadMini2,
            "iPad4,6": .iPadMini2,
            "iPad4,7": .iPadMini3,
            "iPad4,8": .iPadMini3,
            "iPad4,9": .iPadMini3,
            "iPad5,1": .iPadMini4,
            "iPad6,3": .iPadPro9_7,
            "iPad6,11": .iPadPro9_7,
            "iPad6,4": .iPadPro9_7_cell,
            "iPad6,12": .iPadPro9_7_cell,
            "iPad6,7": .iPadPro12_9,
            "iPad6,8": .iPadPro12_9_cell,
            "iPad7,3": .iPadPro10_5,
            "iPad7,4": .iPadPro10_5_cell,
            "iPhone7,1": .iPhone6plus,
            "iPhone7,2": .iPhone6,
            "iPhone8,1": .iPhone6S,
            "iPhone8,2": .iPhone6Splus,
            "iPhone8,4": .iPhoneSE,
            "iPhone9,1": .iPhone7,
            "iPhone9,2": .iPhone7plus,
            "iPhone9,3": .iPhone7,
            "iPhone9,4": .iPhone7plus,
            "iPhone10,1": .iPhone8,
            "iPhone10,2": .iPhone8plus,
            "iPhone10,3": .iPhoneX
        ]
        
        if let model = modelMap[String.init(validatingUTF8: modelCode!)!] {
            return model
        }
        return Model.unrecognized
    }
    
    public var isIPad: Bool {
        
        if let modelCode = modelCode {
            return modelCode.contains("iPad")
        }
        return false
    }
}