Foundation over features

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Foundation over features How investing in our own component framework has helped us build Norway’s largest mobile bank.

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Building a new mobile bank

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For 4 months the app was completely blank Investing time to build a foundation

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Theming Backend simulator Global model store Coordinators Deep linking Design system Skeleton views HTTP Client Repository Authentication library NSOperations abstractions Component framework

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We needed a shared foundation

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One big UICollectionView Account list component Table component

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The missing piece: Layouts

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Composable collection view layout

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• Each component has its own layout • Custom collection view layout takes each component layout and converts it into one big UICollectionViewLayout. Composable collection view layout

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Benefits • Reusable components allows us to share functionality throughout the app • Ability to compose bigger screens out of smaller components • Declarative layout system • Data-driven UIs are easy to unit-test • Animations are handled automatically • Allows us to transition to SwiftUI

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Transitioning to SwiftUI

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Automatically dequeue cells based on layouts

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Take-aways

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• Investing time in building a good foundation can really pay off in the long term • Owning the abstraction gives you a lot of freedom • Use frameworks for the hard problems

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