Open developer options
The way to open the developer options is simple. Go to Settings > General > About Phone > Version Number (multiple clicks), and then enter the password to open it.
Use development tools
Once the developer option is turned on, you can use Xcode or other similar development tools to view the binary code in Apple's mobile phone. These tools allow you to access the system files and other information of Apple mobile phones, and debug and analyze them.
Matters needing attention
The developer option is an advanced setting and only applies to experienced developers. If you are not sure how to use these tools, please don't try them easily, otherwise it may cause problems in the mobile phone system.