The Amazing Race: Performance of Standard iOS Elements and Technologies

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The Amazing Race: Performance of Standard iOS Elements and Technologies By Janina Kutyn

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In this talk Text Rounded corners Shadows Layout

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First, a little theory UIKit CoreAnimation CoreGraphics . . . Hardware

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1001 ways to draw text

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Text UILabel UITextView CATextLayer CoreText TextKit

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1) UILabel

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2) UITextView

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3) CATextLayer

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4) CoreText

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5) TextKit https://github.com/KyoheiG3/AttributedLabel

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TextKit, huh? https://www.raywenderlich.com/2257-text-kit-tutorial-getting-started

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Measuring Performance Always test on device instead of the simulator! iPhone X, iOS 11 Repeat testing Find average result

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Baseline UIView Time in Milliseconds 0 1 0,88

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Execution time UITextView UILabel TextKit CATextLayer CoreText Time in Milliseconds 0 6 12 18 24 30 1,77 2,55 3,43 4,39 27,4

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Execution time CATextLayer CATextLayer + View UILabel Time in Milliseconds 0 1 2 3 4 5 4,39 4,25 2,55

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rounded corners: so basic

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Rounded Corners CALayer + cornerRadius CALayer + mask CoreGraphics

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1) CALayer

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1b) CALayer

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2) CALayer + Bezier Path

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3) CoreGraphics

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Execution time CoreGraphics CALayer + clipsToBounds CALayer + mask CALayer + masksToBounds Time in Milliseconds 0 1 2 3 1,41 1,66 1,91 2,4

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Note: shouldRasterize

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Execution time CALayer + masksToBounds + shouldRasterize Time in Milliseconds 0 1 2 3 2,3 1,41

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shadows: so are they cool or not?!

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Shadows CALayer CoreGraphics UIImage

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1) CALayer

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1b) CALayer + shadowPath

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2) CoreGraphics

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3) UIImage

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Execution time UIImage CALayer CoreGraphics CALayer + shadowPath Time in Milliseconds 0 2 4 6 8 10 2,14 2,33 3,34 9,82

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rounded corners + shadows: you think it’d be easy but it’s not

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Rounded Corners + Shadows Shadow as UIView CAShapeLayer CoreGraphics

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1) Shadow as UIView

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2) CAShapeLayer

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3) CoreGraphics

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Execution time Subview CoreGraphics CAShapeLayer Time in Milliseconds 0 1 2 3 2,1 2,42 3,1

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I’m noticing a trend… CALayer CoreGraphics UIKit

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CoreGraphics Rounded Corners Shadow Rounded Corners + Shadow Time in Milliseconds 0 1 2 3 2,42 2,33 2,4

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AutoLayout? more like AutoDELAYout

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Layout AutoLayout UIStackView Manual

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1) AutoLayout

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2) UIStackView

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3) Manual Layout

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Execution time AutoLayout UIStackView Manual Layout AutoLayout iOS 12 Time in Milliseconds 0 2,8 5,6 8,4 11,2 14 6,65 1,7 12 14

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Final Thoughts UIKit elements have overhead CoreGraphics vs CoreAnimation AutoLayout always slower than manual Up to you to choose what meets your needs

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Thank you!