IOS Dev for Simple iOS App for Special Push Notifications

There is just 1 page/screen. It is a menu of all apps on the phone, (like notifications in settings). You can select an app to give it special notification "styles" like buzz-buzz, or a long buzzzz.

I am a backend developper (this app won't interact with a database or connect to anything else, at least initially), so I have the logic (well, in pseudo code. I don't do mobile) but do not know how e.g. system calls work on iOS/mobile. It seems like kSystemSoundID_Vibrate does this, but I would like to control the duration, intensity etc. I read that such an API call will "produce exactly 0.4 seconds of vibration and 0.1 seconds of silence" but would like to change that and support multiple lengths for different "notification styles".

In sound > haptics, you can create new vibrations. This app should do the same thing, basically.

Using this, I guess: https://developer.apple.com/documentation/corehaptics

If you could do morse code with haptics, that would be amazing.

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If possible, I would also like to ask some basic questions about deploying to the app store (e.g. how often you can push updates etc.)

After this, there can also be a lot of further iOS development needed. 🙂