A journey into Frameworks and Swift

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A journey into Frameworks and Swift September 2016

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Pedro Piñera @pepibumur pepi@soundcloud.com Matej Balantič @skavt matej@soundcloud.com

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● Architecture ● Test coverage ● Coupled ● From iOS 3

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● Reactive ● Fully tested ● Reusable code

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Reusing code Local pods Podfile

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CocoaPods && !Versioning Conflicts changing between branches 1

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Messy Dependency Graph Too many horizontal dependencies 2

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Everyone touching everything Conflicts everywhere

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Growing platforms 2007 2016

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Scaling up the team

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Scaling up the team

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Swift Platform Independent Reduce conflicts Compatible with all the Apple platforms: iOS, tvOS, macOS, watchOS Avoid unnecessary overhead when working with the new setup. Opportunity to start coding Swift. Objc public interface. Vertical dependencies Simple dependency graph that aims vertical dependency over horizontal. Goals

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How?

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iOS tvOS watchOS Core UI

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iOS tvOS watchOS Core UI

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iOS tvOS watchOS Core UI ● Shared models. ● Architectural components. ● Tooling ○ Accessing the Core Data ○ Networking layer ● Colors ● Fonts ● Custom Views

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iOS tvOS watchOS Core UI API Config API Config ● Base URL ● HTTP Headers ● Session token

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iOS tvOS watchOS Core UI API Config API Config ● Base URL ● HTTP Headers ● Session token Tooling

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iOS tvOS watchOS Core UI Logging Analytics Fabric

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Search iOS Core UI tvOS watchOS ...

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Search iOS Core UI tvOS watchOS SearchiOS SearchtvOS ...

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Search iOS Core UI tvOS watchOS Payments SearchiOS SearchtvOS Offline ...

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Search iOS Core UI tvOS watchOS Payments SearchiOS SearchtvOS Offline ...

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Are not reusable among platforms XIBs/Storyboards Platform reusability

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FeatureCore (Business Logic) Platform independent feature Using frameworks FeatureiOS FeaturetvOS FeaturemacOS FeaturetvOS Feature

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⋁ ⋁ “A good target number of dynamic frameworks to have is about half a dozen.” WWDC 2016 - Optimizing Startup Time

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FeatureCore (Business Logic) Platform independent feature Alternative: Using Macros Feature Presentation (Views in code)

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Search iOS Core UI tvOS watchOS SearchiOS SearchtvOS Offline ... App Core Data Offline Database App Keychain

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Search iOS UI tvOS watchOS SearchiOS SearchtvOS Offline ... App Core Data Offline Database App Keychain Core DB Wrapper

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Search iOS UI tvOS watchOS SearchiOS SearchtvOS Offline ... App Core Data Offline Database App Keychain Core DB Wrapper Stream Stream Database

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Benefits ● Fully vertical features. ○ Almost no dependendencies between teams. ● Cleaner data models. Concerns ● Migration time. ● Deletion cascading. Alternatives ● 1 shared with independent tables. ● Dynamically generated merging models. Independent databases Each feature its own database

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Tooling

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Example projects To play with your Frameworks

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Ensuring multi-platform compatibility With Fastlane Thanks Felix #yatusabes

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Playgrounds Easy onboarding Thanks Apple #yatusabes

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Epilogue (There’s no epilogue)

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● Find if it works for you. ○ Team structure/size? ○ Supported platforms/targets? ○ Need to enforce good practices? ● Be aware of the downsides: ○ Xcode still has a long way to go ○ More than 6 dynamic frameworks are discouraged. Are Frameworks for me?

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● Framework oriented programming Link ● Library oriented programming Link ● Building modern frameworks Link ● How to create a Framework for iOS Link ● The unofficial guide to xcconfig files Link ● Static or dynamic libraries Link ● Framework vs library Link ● Micro Features Architecture for iOS Link This slides http://bit.ly/2cTYsrv References

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Gracias Questions? @skavt | @pepibumur (thanks to @LenartLeo for amazing journey map)