Employ the native Apple Passcode or Touch ID functions for an added layer of security with the Scanner app.
1. Select the Settings menu.
2. Select Passcode and Touch ID.
3. If using Touch ID, follow the prompts to allow the phone to recognize your Touch ID print.
4. If using Passcode, enter and confirm the passcode of your choice.
5. You will be prompted to enter the Passcode or use the Touch ID function each time the Scanner app is opened.