Differentiate between Homescreen click and Lock Screen click

Hey guys,

 

I have a bluetooth app that connects to a device. What I want to achieve is this: when a user switches apps or goes to the homescreen, I want to disconnect from the bluetooth device but when a user hits the lock screen, I want the bluetooth connection to be maintained.

 

I am not super familiar with swift and ios dev so any advice would be great.

 

Is there a way to determine whether a app is backgrounded due to the user going to the homescreen and when a user simply locks the phone?

 

Thanks in advance.

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