Open application without tapping on icon

Question

Is there any way by which we can launch the app by the external volume button or by any other gestures made on the iPhone instead of launching by the default way?

OR

Can our app recognise the users interaction with the volume button when app is in the background?

Answer 1

Open application without tapping on icon

you can open app by firing the local or push notification, and it will allow you to get inside your app when allowed. That is the answer of you Heading hope it helps you. Check apple documentation on this. For your detailed question the answers are given above. I know the answer is irrelevant but hope it help for you if you are trying for something like this.