Circular Progressbar using Objective C (cocoa framework)

This video shows how to create circular progressbar using objective-c and cocoa framework. To code this project, I used xcode 7.1.1 and mac os x 10.10.5 Classes used: nsbezierpath, NSAffineTransform Java Version: Circular Progressbar using Java https://youtu.be/zA82Mp5BXC4 C#: https://www.youtube.com/watch?v=uDHo8-DLu1Y