Xcode 在Swift 3中将NSData转换为NSString？

我有一个返回某些系统值的函数。它在Swift 2.2中运行良好，我刚刚升级到Xcode 8和Swift 3，但现在它失败了

func ioPlatExpertDevString(_ property: String) -> String {
    // Start tapping in to the IO Service
    let ioPlatformExpertDevice:io_service_t? = IOServiceGetMatchingService(kIOMasterPortDefault, IOServiceMatching("IOPlatformExpertDevice"))

    var sAnswer = "Not Found"
    let cfAnswer:AnyObject! = IORegistryEntryCreateCFProperty(ioPlatformExpertDevice!, "\(property)" as CFString!, kCFAllocatorDefault, 0).takeRetainedValue()
    if (cfAnswer != nil) {
        let nsAnswer = (cfAnswer as! NSString)
        sAnswer = nsAnswer.uppercased
    }

    // Close the IO Service
    IOObjectRelease(ioPlatformExpertDevice!)

    return sAnswer
}

在此之前，我使用的是“CFData”而不是“AnyObject”。它构建得很好，但在运行时，我得到以下错误：

无法将类型为“\uu NSCFData”（0x7fff7b833ec0）的值强制转换为“NSString”（0x7fff7ac32038）

---

请执行而不是注释类型，除非编译器告诉您这样做

例如，

IOServiceGetMatchingService

返回一个非可选的

io\u服务\u t

，您的可选注释会使情况变得更糟

IORegistryEntryCreateCFProperty

返回

非托管也不需要注释，字符串插值和强制转换为隐式展开也是可选的

CFTypeRef
可以桥铸为本机Swift类型

如果返回类型是
（NS）Data
，则它不太可能在以前的版本中工作

如果可以将
字符串
和
数据
转换为
字符串
，则此代码将考虑这些数据

func ioPlatExpertDevString(_ property: String) -> String {
  // Start tapping in to the IO Service
  let ioPlatformExpertDevice = IOServiceGetMatchingService(kIOMasterPortDefault, IOServiceMatching("IOPlatformExpertDevice"))

  var sAnswer = "Not Found"
  let cfAnswer = IORegistryEntryCreateCFProperty(ioPlatformExpertDevice, property as CFString, kCFAllocatorDefault, 0).takeRetainedValue()
  if let cfData = cfAnswer as? Data, let answer = String(data:cfData, encoding:.utf8) {
    sAnswer = answer.uppercased()
  } else if let answer = cfAnswer as? String {
    sAnswer = answer.uppercased()
  }
  // Close the IO Service
  IOObjectRelease(ioPlatformExpertDevice)
  return sAnswer
}

更换

let nsAnswer = (cfAnswer as! NSString) 

至

let nsAnswer = NSString(data: cfAnswer as! Data, encoding: String.Encoding.utf8.rawValue)

有关最新版本的Swift：

String(decoding: data, as: UTF8.self)

您为哪个属性调用该函数？