Swift: Which direction a UIView is being intersected from?

Question

I am using CGRectIntersectsRect to test if blueView (being dragged) has intersected with redView (stationary). However, I need to know if redView was intersected by blueView from red's top, bottom, right or left? Is there a CG method to accomplish this?

Answer 1

Here is the solution I finally used, In case someone else is looking for it. Below line of code test if the intersection is vertical (top & bottom views intersected), where a and b are view.frame for each of the two view intersecting.

if ((a.maxY > q.maxY) && (b.minY < q.minY)) || ((a.maxY < q.maxY) && (b.minY > q.minY))