SwiftCircleLayers
This is a very simple Swift iOS demo app: tap the screen to add translucent pulsating circles.
Inspired by the following blog post
This demo project differs in that it uses CALayers rather than sub views and drawrect. One benefit of using CALayers is that they are incredibly easy to animate.
NOTE: Requires Swift 1.2.
![screenshot] (http://alskipp.github.io/SwiftCircleLayers/img/screenshot1.png)