1.
Building Swift Libraries for iOS
Marin Todorov

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

3.
Pure

4.
JSONModel
Thanks Objective-C runtime!
SwiftBlah
Types 😱

5.
https://developer.apple.com/library/ios/documentation/Miscellaneous/Conceptual/iPhoneOSTechOverview/Introduction/Introduction.html

6.
15 projects
——————
5 w/ views
9 w/ layers
1 w/ pop

7.
UIView animations

8.
CALayer animations

9.
Motivation
How would I improve the built-in iOS animation
APIs? 🤔

10.
Goals
* easier layer animations
* easier animation sequences
* layer spring animations

11.
David Rönnqvist
https://www.objc.io/issues/12-animations/view-layer-synergy/

12.
UIView.animateWithDuration(1.0, animations: {
})
Create an animation context
Destroy the animation context
Original animations block
Animate layer properties

13.
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

14.
layer.cornerRadius = 50
CABasicAnimation(keyPath: “cornerRadius”)
toValue = 50
fromValue = <current value>
CALayerDelegateCALayer

15.
Layer animations

16.
Goals
* easier layer animations
* easier animation sequences
* layer spring animations

17.
UIView.animateWithDuration(1.0, animations: {
first animation
}).animateWithDuration(1.0, {
second animation
})… etc …
Ideal Pseudo Code

18.
Actual Code

19.
Sequence animations

20.
Goals
* easier layer animations
* easier animation sequences
* layer spring animations

21.
UIKit.animateWithDuration(…)
CABasicAnimation
UIKit.animateWithDuration(…
springDamping: ,
springInitialVelocity: …)
CASpringAnimation on iOS9
RBBSpringAnimation on iOS8
Basic vs Spring Animations

22.
Gotchas
* Premature completion!
* What is a damped harmonic oscillator?
* Retain/release #$!

23.
http://ultradownloads.com.br/papel-de-parede/Meme-Freddie-Mercury/

24.
Thank you!
Marin Todorov
mt@realm.io
@icanzilb
www.underplot.com