WWDC Thoughts and Takeaways

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WWDC Thoughts and Takeaways JJ Lin, LINE iOS Developer #iOS@Taipei #LINE #WWDC2019

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WWDC 2019 ● June 3-7 ● San Jose, California ● Sessions ● Technology Labs ● App Store Labs ● Pro Studio

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UIView-Encapsulated-Layout-Height Conflict constraints

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estimatedItemSize Image Source: WWDC 2016

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estimatedItemSize Image Source: WWDC 2016

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estimatedItemSize Image Source: WWDC 2016

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UICollectionViewFlowLayoutAutomaticSize Image Source: WWDC 2016

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Solution ● Make one constraint breakable, with lower priority (999) ● Use UICollectionView CompositionalLayout (iOS13+)

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UIKit deprecated after SwiftUI released? of course not

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UITableView -> List UICollectionView -> HStack / VStack ? UICollectionView CompositionalLayout UICollectionView DiffableDataSource

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CompositionalLayout ● Orthogonal Scrolling ● FlowLayout ● CollectionView in collectionView ● Difficult to reuse ● CompositionalLayout ● Reusable orthogonal section! ● section.orthogonalScrollingBehavior = .continuous Image Source: WWDC 2019

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CompositionalLayout LayoutDimension ● absolute ● estimated ○ might still meet UIView-Encapsulated-Layout conflict, or AutoresizingMaskLayoutConstraint conflict on CollectionLayoutGroup ○ need to set cell constraint breakable, with lower priority (999) ● fractional ○ auto resize after rotation / bound change

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DiffableDataSource performBatchUpdates() apply()

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DiffableDataSource Snapshots Truth of UI state Unique identifiers for sections and items No more IndexPaths Source: WWDC 2019

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Demo Source: WWDC 2019

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References WWDC 2016: What's New in UICollectionView in iOS 10 WWDC 2018: A Tour of UICollectionView WWDC 2019: Advances in Collection View Layout WWDC 2019: Advances in UI Data Sources

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Pro Studio

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Image Source: WWDC App

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Mac Pro Interior System in AR

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8K Video Editing

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Hundreds tracks processing Image Source: WWDC App

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Pro Display XDR

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Reality Composer Create/Edit AR on Mac Play on iPad

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Reality Composer Create/Edit AR on iPad

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ARKit 3 People Occlusion

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One more thing...

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We are Hiring! iOS Developer Android Developer QA / Automation Engineer Front-end Engineer Back-end Engineer Data Engineers Security Engineer Developer Relations More Info: https://career.linecorp.com https://lin.ee/dL8kXg

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Thank you