- (NSString *)UUID
{
CFUUIDRef uuid_ref = CFUUIDCreate(NULL);
CFStringRef uuid_string_ref= CFUUIDCreateString(NULL, uuid_ref);
CFRelease(uuid_ref);
NSString *uuid = [NSString stringWithFormat:@"%@",uuid_string_ref];
CFRelease(uuid_string_ref);
return uuid;
}
原文：http://www.cnblogs.com/limicheng/p/4286271.html