@LinYudan, Thanks for posting in Q&A. Based as I know, for the "iOS store app" option, code modifications will only take effect after being published to the Apple App Store. Alternatively, you can choose the "line-of-business app" option, but it requires activation of Apple Business Manager, which is not necessary for testing purposes.
If you integrate your iOS with the Intune App SDK and need to test. You can create Microsoft Intune test account to test. Here is a link with more details.
https://learn.microsoft.com/en-us/mem/intune/developer/app-sdk-get-started#test-your-app
Hope the above information can help.
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