开发时候, 我们免不了根据设备型号来做一些视图上的调整, 或者上传日志的时候, 也要收集用户的设备型号.
参考: https://www.theiphonewiki.com/wiki/Models
iPad 可能不齐, iPhone 是齐的, 另外如果没有名称就用默认的 identifier

func getModelName() -> 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 "iPod5,1":                                 return "iPod Touch 5"
        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", "iPhone5,2":                  return "iPhone 5"
        case "iPhone5,3", "iPhone5,4":                  return "iPhone 5c"
        case "iPhone6,1", "iPhone6,2":                  return "iPhone 5s"
        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 5SE"
        case "iPhone9,1", "iPhone9,3":                  return "iPhone 7"
        case "iPhone9,2", "iPhone9,4":                  return "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 "iPhone11,2":                              return "iPhone Xs"
        case "iPhone11,4", "iPhone11,6":                return "iPhone Xs Max"
        case "iPhone11,8":                              return "iPhone Xr"
            
        case "iPhone12,1":                              return "iPhone 11"
        case "iPhone12,3":                              return "iPhone 11 Pro"
        case "iPhone12,5":                              return "iPhone 11 Pro Max"
            
        case "iPad2,1", "iPad2,2", "iPad2,3", "iPad2,4":return "iPad 2"
        case "iPad3,1", "iPad3,2", "iPad3,3":           return "iPad 3"
        case "iPad3,4", "iPad3,5", "iPad3,6":           return "iPad 4"
        case "iPad6,11", "iPad6,12":                    return "iPad 5"
        case "iPad7,5", "iPad7,6":                      return "iPad 6"
        case "iPad4,1", "iPad4,2", "iPad4,3":           return "iPad Air"
        case "iPad5,3", "iPad5,4":                      return "iPad Air 2"
        case "iPad2,5", "iPad2,6", "iPad2,7":           return "iPad Mini"
        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 "iPad6,3", "iPad6,4":                      return "iPad Pro 9.7"
        case "iPad6,7", "iPad6,8", "iPad7,1", "iPad7,2":return "iPad Pro 12.9"
        case "iPad7,3", "iPad7,4":                      return "iPad Pro 10.5"
            
        case "AppleTV5,3":                              return "Apple TV"
        case "i386", "x86_64":                          return "Simulator"
        default:                                        return identifier
        }
    }