Hi guys. I still haven't solved this gpx issue completely. But I have found a temporary solution. First, I tried hablo's solution that mentioned above. And I could add custom gpx file when I ran my app. At this time, I can also add a new scheme or edit a scheme. I could change default location in Options menu. So, I changed default location to my custom gpx file. And then I rebooted my Mac. When I excuted my xcode file, I couldn't add my custom gpx file also. The default location I changed hadn't my custom gpx file on the list. But, I could change GPS when I ran my app. I can't write my mention fluently. But I want to share this solution for you guys who don't want to reboot every time for a custom gpx. Thank you. :)