How Apple knows you're using the private API

There are about three different ways

1. Otool-l
   This tool can clearly list all of your linked libraries like Io.kit is not allowed to use

2. Nm-u

   This tool can clearly list all of your link symbols
   such as the C method OC method

3. Check for all Selecter strings

Occlass selector is placed in a special area, so you can just use the private API to detect

If you really want to use the private API with runtime to solve

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API Detection Tool Https://github.com/nomenas/APIChecker

In order to avoid using the private API when writing code, you can determine whether it is private by the following methods

1. ALT + Double-click. What can be found is considered to be public.

2. The metropolis of undocumented is reported warning

How Apple knows you're using the private API