UIBezierPath, CABasicAnimation and Swift

Target

Target of this post is to create an easy-to-use progress indicator class written in Swift 4.0.

Actors

In this post we need to define a set of actors in order to make it clear how to write the best API.

Actors:

1. End user – part of code that creates / calls API
2. Developer – we write the actual code, so we call ourselves like this
3. Supporter – person / AI that is going to support the code after we’re done

API

Required features are limited to the following:

1. Create different shapes to be animated
2. Create different animation direction / paths
3. Set animation duration
4. Animation control (pause/resume/manual)
5. Change animation duration “on-the-fly”

Contents

1. Progress Indicator v1

References

• https://developer.apple.com/library/content/documentation/Cocoa/Conceptual/CoreAnimation_guide/CoreAnimationBasics/CoreAnimationBasics.html#//apple_ref/doc/uid/TP40004514-CH2-SW12
• http://coveller.com/2016/05/core_animation_timing/
• http://ronnqvi.st/controlling-animation-timing
• https://github.com/mathewsanders/Scrubber
• https://milen.me/writings/core-animation-3d-model/
• https://medium.com/@flyosity/your-spring-animations-are-bad-and-it-s-probably-apple-s-fault-784932e51733
• https://www.objc.io/issues/12-animations/animations-explained/