How to find out the list of applications running on iPhone from your own?

Question

iOS

Good afternoon. I am writing a task to develop a specific application for iOS. But I'm not sure that this platform allows you to get the data I need. Please tell me how (and is it possible in principle) to receive the following data:
1. List of applications installed in the system.
2. List of applications running in the system.
3. Current active application.

Answer 1

1 no way
2 no way
3 if your application is active now, then the active application is yours, otherwise nothing
The option with jailbreak and private api I do not consider
UPD. if you wish, you can try to find out if the user has some applications installed from a list that is known in advance and hardwired into your application via [UIApplication canOpenURL: "url with the scheme of the desired application"