How to tame Core Animation

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tame adjective Reduced from a state of native wildness especially so as to be tractable and useful to humans

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About me 15+ years of experience Swift developer Open source

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a queue management system

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Serving millions of people every month

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Mr. Byte

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Animations = easy?

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– Soroush Khanlou “Animations in iOS are easy, except when they’re not.”

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Intro to Core Animation Animation path property Real life example Agenda

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SwiftUI

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What is animation?

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What is animation?

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About Core Animation

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➡ Layer Kit ➡ August 7, 2006 WWDC ➡ Mac OS X 10.5 Leopard ➡ Created by John Harper About Core Animation

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Core animation

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Core Animation provides high frame rates and smooth animations without burdening the CPU and slowing down your app. – Apple Documentation

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NO. Is Core Animation == UIView animations ?

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Core Graphics

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developer.apple.com

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Core Animation ???

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➡ iOS, macOS and tvOS ➡ Hardware accelerated GPU ➡ Runs on separate process Core Animation ???

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Time of completion & frames

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Animation Time Span New Value Existing Value frame.origin.x CALayers

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0.25 seconds * 60 frames = 15 locations Interpolation example

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Interpolation types

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animation.timingFunction = CAMediaTimingFunction(name: .linear) // default // easeIn // easeInEaseOut // easeOut // linear

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Animation types

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Animation types ➡ Basic Animation ➡ Keyframe Animations ➡ Grouping Animations

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setBounds CALayers

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Layers vs Views

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Views Layers vs complex, Auto Layout user interaction CPU powered restricted no responder chain drawn on the GPU

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CAShapeLayer

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let bezierPath = UIBezierPath() bezierPath.move(to: point1) bezierPath.addLine(to: point2) bezierPath.addLine(to: point3) bezierPath.addLine(to: point1) bezierPath.close() let shapeLayer = CAShapeLayer() shapeLayer.path = bezierPath.cgPath shapeLayer.lineWidth = 0 shapeLayer.fillColor = fillColor.cgColor self.layer.addSublayer(shapeLayer)

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let bezierPath = UIBezierPath() bezierPath.move(to: point1) bezierPath.addLine(to: point2) bezierPath.addLine(to: point3) bezierPath.addLine(to: point1) bezierPath.close() let shapeLayer = CAShapeLayer() shapeLayer.path = bezierPath.cgPath shapeLayer.lineWidth = 1 shapeLayer.fillColor = fillColor.cgColor self.layer.addSublayer(shapeLayer)

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let bezierPath = UIBezierPath() bezierPath.move(to: point1) bezierPath.addLine(to: point2) bezierPath.addLine(to: point3) bezierPath.addLine(to: point1) bezierPath.close() let shapeLayer = CAShapeLayer() shapeLayer.path = bezierPath.cgPath shapeLayer.lineWidth = 1 shapeLayer.fillColor = fillColor.cgColor self.layer.addSublayer(shapeLayer)

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let pathAnimation = CABasicAnimation(keyPath: #keyPath(CAShapeLayer.path)) shapeLayer.add(pathAnimation, forKey: "pathAnimation") pathAnimation.toValue = triangle.cgPath pathAnimation.duration = 1.0 pathAnimation.timingFunction = CAMediaTimingFunction(name: .easeInEaseOut) pathAnimation.autoreverses = true pathAnimation.repeatCount = .greatestFiniteMagnitude

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let animationGroup = CAAnimationGroup() animationGroup.animations = [...] animationGroup.autoreverses = true animationGroup.repeatCount = .greatestFiniteMagnitude animationGroup.duration = 2.0

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let animationGroup = CAAnimationGroup() animationGroup.animations = [...] animationGroup.autoreverses = true animationGroup.repeatCount = .greatestFiniteMagnitude animationGroup.duration = 2.0

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let animationGroup = CAAnimationGroup() animationGroup.animations = [...] animationGroup.autoreverses = true animationGroup.repeatCount = .greatestFiniteMagnitude animationGroup.duration = 2.0

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Snøhetta to build Shanghai Grand Opera House with spiral staircase roof

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Cartesian Coordinates Polar Coordinates

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fassko/animatingLavaTriangles

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Experiment with animations

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Know when it’s too much CA is powerful & well documented API Hard to do something out of bounds Conclusions