SecureUDIDUDID 解决方案

SecureUDID 是一个开源的基于沙箱机制的 UDID 解决方案，旨在解决苹果因为废弃了 UDID 后导致的隐私问题。

示例代码：

#import "SecureUDID.h"

NSString *domain     = @"com.example.myapp";
NSString *key        = @"difficult-to-guess-key";
NSString *identifier = [SecureUDID UDIDForDomain:domain usingKey:key];
// The returned identifier is a 36 character (128 byte + 4 dashes) string that is unique for that domain, key, and device tuple.