iOS 获取UUID

-(NSString*)GetUUID

{

CFUUIDRef puuid = CFUUIDCreate( nil );

CFStringRef uuidString = CFUUIDCreateString( nil, puuid );

NSString * result = (NSString *)CFBridgingRelease(CFStringCreateCopy( NULL, uuidString));

CFRelease(puuid);

CFRelease(uuidString);

return result;

}