Practical iOS application modularity

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Mobile Developer Conference N Y C 8 26 15 Practical iOS application modularity Bryan Irace

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M D C N Y C

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M D C N Y C

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M D C N Y C

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M D C N Y C + (UIApplication *)sharedApplication NS_EXTENSION_UNAVAILABLE_IOS

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M D C N Y C Limit which parts of the codebase know about which other parts.

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M D C N Y C When concerns are well-separated, individual sections can be reused, as well as developed and updated independently. -Wikipedia

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M D C N Y C One big codebase Small Isolated Knowable Components Many Easily or

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M D C N Y C Modularity = • Easier to build separate applications • New products • iOS or OS X • iOS extensions • watchOS applications

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M D C N Y C Modularity = • Additional overhead • More repositories, READMEs to update, version numbers to increment • Tooling complexity • CocoaPods, Carthage, Gradle, etc.

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M D C N Y C { "name": "ComposeUI", "summary": “Tumblr’s composition UI for iOS.", "platforms": { "ios": "8.0" }, "requires_arc": true, "frameworks": [ "Foundation", "UIKit", ], "source_files": "Classes/**/*.{h,m}", "resources": "Resources/*", "dependencies": { "SharedUI": [], } } { "name": "SharedUI", "summary": "UI components shared across Tumblr’s apps and extension", "platforms": { "ios": "8.0" }, "requires_arc": true, "frameworks": [ "Foundation", "UIKit" ], "source_files": "Classes/**/*.{h,m}", "resources": "Resources/*" }

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M D C N Y C pod 'Reachability', '3.2' pod 'MTMigration', '0.0.3' pod 'HockeySDK', '3.7.1' pod '1PasswordExtension', '1.1.0'

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M D C N Y C Development pods

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M D C N Y C Development pods • No need to version • Can be anywhere on disk, e.g. in the app’s repository • Easy to make one pull request against multiple modules

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M D C N Y C pod 'ComposeUI', :path => ‘Components/ComposeUI' pod 'ExploreUI', :path => 'Components/ExploreUI' pod 'SharedUI', :path => 'Components/SharedUI' pod 'CoreTumblr', :path => 'Components/CoreTumblr' pod 'CoreExplore', :path => 'Components/CoreExplore' pod 'Logger', :path => 'Components/Logger'

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M D C N Y C Compose UI Core Tumblr Tumblr SDK Explore UI Core Explore Network Abstractions Shared UI Logger Video Player Audio Share extension Today widget App

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M D C N Y C Compose UI Core Tumblr Tumblr SDK Explore UI Core Explore Network Abstractions Shared UI Logger Video Player Audio

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M D C N Y C Flexibility • Can always turn dev. pods into “real pods” • Xcode project only knows about .framework ﬁles • Could always move away from CocoaPods

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M D C N Y C Summary • Modular codebases facilitate rapid product development • “Development pods” provide many beneﬁts of modularity without too much overhead

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M D C N Y C : bryan : irace Thank you! [email protected]