Practical iOS application modularity

Slides from Yahoo’s NYC Mobile Developer Conference (http://ymdcnyc.tumblr.com) on 8/26/2015.

Transcript

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

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2. M D C N Y C
   

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3. M D C N Y C
   

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4. M D C N Y C
   

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

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

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

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9. 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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10. 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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11. 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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12. 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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13. M D C N Y C
    Development pods
    

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14. 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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15. 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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16. 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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17. 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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18. 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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19. 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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20. M D C N Y C
    : bryan : irace
    Thank you!
    bryan@tumblr.com
    

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