I'll look into the internals of a Swift library developed for iOS that heavily uses UIKit and the ObjectiveC runtime. Since those are two dependencies you can't get rid off why not make the best out of them? I'm going to look into how I could stand of the shoulders of giants to deliver a slim but flexible Swift lib with the ObjectiveC runtime blessing.

1. Building Swift Libraries for iOS
Marin Todorov

2. Marin Todorov
www.realm.io www.raywenderlich.com

6. Pure

7. JSONModel
Thanks Objective-C runtime!
SwiftBlah
Types 😱

9. https://developer.apple.com/library/ios/documentation/Miscellaneous/Conceptual/iPhoneOSTechOverview/Introduction/Introduction.html

11. 15 projects
——————
5 w/ views
9 w/ layers
1 w/ pop

12. UIView animations

13. CALayer animations

14. Motivation
How would I improve the built-in iOS animation
APIs? 🤔

15. Goals
* easier layer animations
* easier animation sequences
* layer spring animations

16. David Rönnqvist
https://www.objc.io/issues/12-animations/view-layer-synergy/

17. UIView.animateWithDuration(1.0, animations: {
})
Create an animation context
Destroy the animation context
Original animations block
Animate layer properties

18. view.alpha = 0.5
layer.position.y = 200
layer.cornerRadius = 50
UIView.actionForLayer(layer, “alpha”)
CAAnimation
UIView.actionForLayer(layer, “position.y”)
CAAnimation
UIView.actionForLayer(layer, “cornerRadius”)
NSNull

19. layer.cornerRadius = 50
CABasicAnimation(keyPath: “cornerRadius”)
toValue = 50
fromValue = <current value>
CALayerDelegateCALayer

20. Layer animations

21. Goals
* easier layer animations
* easier animation sequences
* layer spring animations

22. UIView.animateWithDuration(1.0, animations: {
first animation
}).animateWithDuration(1.0, {
second animation
})… etc …
Ideal Pseudo Code

23. Actual Code

24. Sequence animations

25. Goals
* easier layer animations
* easier animation sequences
* layer spring animations

26. UIKit.animateWithDuration(…)
CABasicAnimation
UIKit.animateWithDuration(…
springDamping: ,
springInitialVelocity: …)
CASpringAnimation on iOS9
RBBSpringAnimation on iOS8
Basic vs Spring Animations

27. Gotchas
* Premature completion!
* What is a damped harmonic oscillator?
* Retain/release #$!

28. http://ultradownloads.com.br/papel-de-parede/Meme-Freddie-Mercury/

29. Thank you!
Marin Todorov
mt@realm.io
@icanzilb
www.underplot.com