如何从不同的目标访问数组（KeyboardViewController）

I'm just beginning Swift after spending a considerable amount of time learning java. I'm trying to create a keyboard app. I created a new target KeyBoardViewController, and am trying to access an array I created and mutated within my ViewController class. I am a bit confused reading the documentation regarding access levels in swift. I see that my ViewController.swift and KeyboardViewController.swift are in different folders. I imported my module containing ViewController into my KeyboardViewController, but it still is unable to access the array I need.I'm just beginning Swift after spending a consi