class Coordinator:NSObject, CountryPickerDelegate{
        var parent: CountryPickerUI
        
        init(_ parent: CountryPickerUI) {
            self.parent = parent
        }
    }

I’m having a hard time understanding swift, I have questions here.

1. what does the _ besides parent mean?

2. What does NSObject, CountryPickerDelegate do? does it mean coordinator class should be NSObj and CountryPickerDelegate?

I just need an explanation. Sorry, newbie here.