You are importing UIKit in a ViewController class that inherits each UIViewController but Is it necessary?

[keisukeYamagishi]

As the title says,
You are importing UIKit in a ViewController class that inherits each UIViewController but Is it necessary?
Since we are importing ARKit, isn't it unnecessary?

Please check the following excerpts.

ARKit-Sampler/ARKit-Sampler/Samples/ARDrawing/ARDrawingViewController.swift

Line 9 in 72b0feb

import UIKit