Read User-Defined Settings from custom .plist file - swift

Question

I should use different API keys for different schemes (like Debug, QA, Release).
And I want to use a custom .plist file for that (Config.plist). Not other ways because of my project's architecture.
I configured User-Defined Settings in Build Settings
I followed these steps:
Create a custom User-Defined Settings named MY_API_KEY,
Add API key to different schemes,
Create a new Config.plist's User-Defined Settings for read from Info.plist,
Write CONFIG_FILE to Info.plist,
Write MY_API_KEY to the custom plist (Config.plist),
So I want to read MyAPIKey value from Config.plist but it returns ${MY_API_KEY} as a String.
Expected result is "asdfsadf" (value from User-Defined Settings).
NOTE:
I didn't post my way for read values from plists because I'm using my custom services for read plists.

Answer 1

First of all, you should use parentheses instead of curly braces:
So change this:
${MY_API_KEY}
${CONFIG_FILE}
to this:
$(MY_API_KEY)
$(CONFIG_FILE)
And second of all, why you don't use different info.plist files for different environments?
You can use info.plist File attribute to assign different plist files for different environments:
So you can have entirely custom plist file per environment.