Self.vertices is an NSSet. I'm having trouble getting the Vertex value out of the optional
The code below crashes in playgrounds.
func getVertex (x: Double, y: Double,z: Double) -> Vertex?
{
for v : Vertex! in self.vertices {
if v.isEqualTo(x, y: y, z: z) {
return v
}
}
return nil
}
that may be helpful: