Check which device is being used

DeviceDetector.swift

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",
    iPadAir1         = "iPad Air 1",
    iPadAir2         = "iPad Air 2",
    iPadPro9_7       = "iPad Pro 9.7\"",
    iPadPro9_7_cell  = "iPad Pro 9.7\" 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 {
    public var type: Model {
        var systemInfo = utsname()
        uname(&systemInfo)
        let modelCode = withUnsafePointer(to: &systemInfo.machine) {
            $0.withMemoryRebound(to: CChar.self, capacity: 1) {
                ptr in String.init(validatingUTF8: ptr)
                
            }
        }
        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,
            "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,
            "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" : .iPhone8,
            "iPhone10,4" : .iPhone8plus,
            "iPhone10,5" : .iPhoneX,
            "iPhone10,6" : .iPhoneX
        ]
        
        if let model = modelMap[String.init(validatingUTF8: modelCode!)!] {
            return model
        }
        return Model.unrecognized
    }
}