Core Language Swift Samples
- https://developer.apple.com/documentation/swift
- https://developer.apple.com/library/content/documentation/Swift/Conceptual/Swift_Programming_Language/index.html
- https://developer.apple.com/documentation/uikit
- http://www.ralfebert.de/ios-examples/uikit/uicatalog-playground/
- https://github.com/tejas123/User-Interaction-with-Camera-using-UIImagePickerController-in-Swift-