Detect collision of two UIView's in swift

Question

I have two UIViews on my ViewController. I added panGesture to first view and when i start moving this view the second view will move towards first view. I want to detect an

Answer 1

what about

if (CGRectIntersectsRect(secondView.frame, sender.frame)) {
        // Do something
    }

CGRectIntersectsRect(::) : Returns whether two rectangles intersect.