Can an iOS background app show a picture?

Question

iOS

Good afternoon! I want to know if the application running in the background mode has the ability to show a picture over the active one? You don't need to interact with it, just display information, like a reminder, and hide it after a couple of seconds.
Thanks in advance for your reply. Honestly, I doubt that this is possible, but I want to make sure.

Answer 1

As far as I know, the application cannot work in the background at all (with the exception of cases specifically defined in the documentation, which are like six EMNIPs).
But suddenly, if this suits you, you can make an internal timer notification with a picture. It won't be full screen, but still. Here is a video about local notifications, where this option is also considered: https://m.youtube.com/watch?v=U1HTftA5GZw

Answer 2

Do you even understand that this simply cannot be? WELL, who in their right mind will allow you for no reason at all, according to your desire (meaning your application), to do something at all if your application is inactive, and even more so to show a picture OVER. Of course, this is not the case, never has been, and never will be. All you can do is intermittently do a number of things (see the documentation) that usually involve small requests for information from outside.
That is, you are limited both in time and in the list of actions that can never be displayed. When you close the application, you only have a certain amount of time that you have time to do, say, close the connection to the database or do something else. If this time is not enough, you can ask the system for more. With a high probability, the system will give the go-ahead, but again, this time will be extremely short. Seconds.
And as for periodic actions in the background according to the schedule, they are extremely scarce and are aimed only at obtaining any information.
In general, this is the only correct and necessary way for an application to interact in the background. This is called so, because NOBODY wants the application that I closed to try to shove something into me. Obviously this will never happen and ... right. Apple in this regard, well done!