I have an app that coded with B4A, I want to know that with the current version of B4i is it possible to recode the current project? or there're some features that is not implemented in the current version of B4i?
The question is a bit too broad, can you be more specific about what the app does, which libraries you are using.
The answer is of course yes it can be re-coded, but how much work it will be depends on what libraries are used and if there is a one to one correspondence with functions from B4a to B4i that you have used and if the functionality is actually available in IOS, or will need to be done differently.