Where is the best place to store api keys in an ios application?

Question

iOS

Good afternoon.
Tell me where in the ios application it is best to store keys from a third-party API (clientid, clientssecret) and other secret credentials. I read that such data cannot be stored in the config file, because the config can be downloaded by installing the application and peeking.
There is also a preprocessor macro. Is it worth putting them in there?
Maybe some other options.
Thank you.

Answer 1

Probably the safest way is to store such data in keyChain.
Here is how to do it:
https://www.raywenderlich.com/6475/basic-security-...

Answer 2

I usually throw in the class of constants

Answer 3

define (#define) into the model or model helper. If you are using MVC correctly