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.

https://github.com/shu223/ARKit-Sampler/blob/72b0feb15ce009506673b9e69f555cf989b23f1a/ARKit-Sampler/Samples/ARDrawing/ARDrawingViewController.swift#L9