CGRectIntersectsRect [duplicate]

Answer 1

If you want to detect when the rect of your ball is touching the edge of the rect of your maze (rather than just anywhere in the maze), you need to test for !CGRectEqualToRect(CGRectIntersection(ball, maze), maze) in addition to CGRectIntersectsRect(ball, maze).

Answer 2

CGRectIntersectsRect is going to return true if any part of rect1 lies inside of rect2. So while your ball is completely inside your maze, your intersection test will always be true.