Determine if UIView is visible to the user?

Question

is it possible to determine whether my UIView is visible to the user or not?

My View is added as subview several times into a Tab Bar

Answer 1

This can help you figure out if your UIView is the top-most view. Can be helpful:

let visibleBool = view.superview?.subviews.last?.isEqual(view)
//have to check first whether it's nil (bc it's an optional) 
//as well as the true/false 
if let visibleBool = visibleBool where visibleBool { value
  //can be seen on top
} else {
  //maybe can be seen but not the topmost view
}