Reusable Animations in Swift

A journey of mastering the endless nesting of completion blocks in UIView.animate.

Presentation was held on iOS Munich 08/03/2018
https://www.meetup.com/de-DE/The-Munich-iOS-Developers-Meetup/events/248032487/

Transcript

1. Reusable Animations from the bottom up INCL. CUSTOM OPERATORS, DEPRECATED & LENSES Elmar Kretzer @elmkretzer
2. back in the days
3. I wrote a function
4. wrong abstraction
5. Minor changes, Major pain Yeah, basically it’s the same animation, except its turning blue ... and later to the right, not the left ... exactly, but no alpha this time ...
6. + easy to describe with words smaller green rotate 90 normal yellow rotate 0 bigger green rotate 0 0.5 opacity then + + + + + + then
7. executes immediately
8. 1. lazy
9. 2. declarative
10. 3. configurable
11. 4. reusable
12. reusable? really? ARE YOU KIDDING?
13. reveal the pattern YOU ARE KIDDING?
14. atomic YOU ARE KIDDING? Prior Art
15. easy to describe with words + smaller \.backgroundColor .~ green rotate 90 normal yellow rotate 0 bigger green rotate 0 0.5 opacity then + + + + + + then
16. Hello Lisp YOU ARE KIDDING?
17. Composition YOU ARE KIDDING? Prior Art
18. molecular YOU ARE KIDDING?
19. easy to describe with words >>> \.transform .~ scale(0.5) \.backgroundColor .~ green rotate 90 normal yellow rotate 0 bigger green rotate 0 0.5 opacity then + + + + + + then
20. Recursive Type YOU ARE KIDDING?
21. Convenience YOU ARE KIDDING?
22. Deprecated?
23. Switch the implementation YOU ARE KIDDING?
24. Way to easy But, hey ... these functions all create a single step. How do you compose the recursive steps?
25. Pattern matching
26. Pattern matching
27. Lego
28. My learnings? Don’t do it - describe it. Reusability starts with atoms. There is no silver bullet.
29. Me on Twitter: @elmkretzer thanks for your time! More Algebra: https://www.pointfree.co/ Composable CoreAnimation: https://github.com/bkase/swift-fp-animations