Swift CChar元祖转String

iOS有些API是调用C函数，Swift端获得的数据是CChar元祖，需要转成String方便使用，下面的代码以获取手机型号为例

方式一

var systemInfo = utsname()
uname(&systemInfo)
let deviceModel = withUnsafePointer(to: systemInfo.machine)  { tuplePointer in
    let cCharPointer = unsafeBitCast(tuplePointer, to: UnsafePointer<CChar>.self)
    let machine = String(utf8String: cCharPointer)!
    print("machine: \(machine)")
    return machine
}

方式二

var systemInfo = utsname()
uname(&systemInfo)

let mirror = Mirror(reflecting: systemInfo.machine)
let arr = mirror.children.map { $0.value as! CChar }
let machine = String(cString: arr)