Fix Untrusted Developer
Published by @SoNiceInfo at 6/24/2020
Here is how to fix
When you try to test an app created with Xcode on an actual device, you may see "Untrusted Developer".
This is due to iOS determining that the signature of the app is not a reliable one.
When I build the source of an app on the internet such as GitHub, I get the same alarm and cannot open it.
It's proof that Apple is preventing users from installing rogue apps.
To make the app open without this alarm, manually register it as a trustworthy one.
As shown in the above screen, go to "Settings" > "General" > "Profile" and "Trust".