扩展后使用:UIDevice.modelName

import UIKit
public extension UIDevice {
var modelName: String {
    var systemInfo = utsname()
    uname(&systemInfo)
    let machineMirror = Mirror(reflecting: systemInfo.machine)
    let identifier = machineMirror.children.reduce("") { identifier, element in
        guard let value = element.value as? Int8, value != 0 else { return identifier }
        return identifier + String(UnicodeScalar(UInt8(value)))
    }
    switch identifier {
    case "iPod1,1":  return "iPod Touch 1"
    case "iPod2,1":  return "iPod Touch 2"
    case "iPod3,1":  return "iPod Touch 3"
    case "iPod4,1":  return "iPod Touch 4"
    case "iPod5,1":  return "iPod Touch (5 Gen)"
    case "iPod7,1":   return "iPod Touch 6"
    case "iPhone3,1", "iPhone3,2", "iPhone3,3":  return "iPhone 4"
    case "iPhone4,1":  return "iPhone 4s"
    case "iPhone5,1":   return "iPhone 5"
    case  "iPhone5,2":  return "iPhone 5 (GSM+CDMA)"
    case "iPhone5,3":  return "iPhone 5c (GSM)"
    case "iPhone5,4":  return "iPhone 5c (GSM+CDMA)"
    case "iPhone6,1":  return "iPhone 5s (GSM)"
    case "iPhone6,2":  return "iPhone 5s (GSM+CDMA)"
    case "iPhone7,2":  return "iPhone 6"
    case "iPhone7,1":  return "iPhone 6 Plus"
    case "iPhone8,1":  return "iPhone 6s"
    case "iPhone8,2":  return "iPhone 6s Plus"
    case "iPhone8,4":  return "iPhone SE"
    case "iPhone9,1":   return "国行、日版、港行iPhone 7"
    case "iPhone9,2":  return "港行、国行iPhone 7 Plus"
    case "iPhone9,3":  return "美版、台版iPhone 7"
    case "iPhone9,4":  return "美版、台版iPhone 7 Plus"
    case "iPhone10,1","iPhone10,4":   return "iPhone 8"
    case "iPhone10,2","iPhone10,5":   return "iPhone 8 Plus"
    case "iPhone10,3","iPhone10,6":   return "iPhone X"
 
   case "iPhone11,8":   return "iPhone XR"
   case "iPhone11,2":   return "iPhone XS"
   case "iPhone11,6","iPhone11,4":   return "iPhone XS Max"
   case "iPhone12,1":   return "iPhone 11"
   case "iPhone12,3":   return "iPhone 11 Pro"
   case "iPhone12,5":   return "iPhone 11 Pro Max"
   case "iPhone12,8":   return "iPhone SE2"
   case "iPhone13,1":   return "iPhone 12 mini"
   case "iPhone13,2":   return "iPhone 12"
   case "iPhone13,3":   return "iPhone 12 Pro"
   case "iPhone13,4":   return "iPhone 12 Pro Max"

    case "iPad1,1":   return "iPad"
    case "iPad1,2":   return "iPad 3G"
    case "iPad2,1", "iPad2,2", "iPad2,3", "iPad2,4":   return "iPad 2"
    case "iPad2,5", "iPad2,6", "iPad2,7":  return "iPad Mini"
    case "iPad3,1", "iPad3,2", "iPad3,3":  return "iPad 3"
    case "iPad3,4", "iPad3,5", "iPad3,6":   return "iPad 4"
    case "iPad4,1", "iPad4,2", "iPad4,3":   return "iPad Air"
    case "iPad4,4", "iPad4,5", "iPad4,6":  return "iPad Mini 2"
    case "iPad4,7", "iPad4,8", "iPad4,9":  return "iPad Mini 3"
    case "iPad5,1", "iPad5,2":  return "iPad Mini 4"
    case "iPad5,3", "iPad5,4":   return "iPad Air 2"
    case "iPad6,3", "iPad6,4":  return "iPad Pro 9.7"
    case "iPad6,7", "iPad6,8":  return "iPad Pro 12.9"

    case "AppleTV2,1":  return "Apple TV 2"
    case "AppleTV3,1","AppleTV3,2":  return "Apple TV 3"
    case "AppleTV5,3":   return "Apple TV 4"
    case "i386", "x86_64":   return "Simulator"
    default:  return identifier
    }
}
}