ios - [[NSUUID new] UUIDString] 和 CFUUIDRef 之间有什么区别

Question

任何人都可以让我知道通过下面给出的这两种实现创建唯一 ID 之间的区别是什么

1)

  CFUUIDRef cfuuid = CFUUIDCreate(kCFAllocatorDefault);
    NSString *udidString = (NSString*)CFBridgingRelease(CFUUIDCreateString(kCFAllocatorDefault, cfuuid));

2) NSString *guid = [[NSUUID new] UUIDString];

哪个更可靠，因为我正在开发来自 IOS 8 及更高版本的应用程序。

Answer 1

您可以在 NSHipster's uuid-udid-unique-identifier post 上找到详细信息.

为了不在此处发布“仅链接”答案是同一篇文章的摘录:

NSUUID was added to Foundation in iOS 6 as a way to easily create UUIDs.

If your app targets iOS 5 or earlier, however, you have to settle for Core Foundation functions on CFUUIDRef

总而言之，虽然两者都返回有效的 UUID，但继续使用 NSUUID 更容易。