iOS开发--获取机器码 UUID

 -(NSString*)getID
{
    CFUUIDRef puuid=CFUUIDCreate(nil);
    CFStringRef uuidString=CFUUIDCreateString(nil, puuid);
    // NSString *result=(NSString*)CFStringCreateCopy(NULL,uuidString);
    NSString *result=(NSString*)CFBridgingRelease(CFStringCreateCopy(NULL, uuidString));
    return result;
}