A simple example of face detection using Vision framework.
Created by OOPer in cooperation with shlab.jp, on 2017/7/21.
The code base and the UI design is taken from the translated version of Apple's sample code: SquareCam. https://developer.apple.com/library/content/samplecode/SquareCam/Introduction/Intro.html#//apple_ref/doc/uid/DTS40011190
See also: https://github.com/ooper-shlab/SquareCam-Swift.
===========================================================================
Xcode 13, iOS SDK 15
===========================================================================