A convention for Objective-C libraries

The following convention defines a file system structure for a shared Objective-C library.

LibraryName/
  .clang-format           <- Libraries are expected to use clang-format.
  .jazzy.yaml             <- Libraries should support the Jazzy documentation generator.
  .travis.yml             <- Libraries should support Travis CI.
  
  CHANGELOG.md            <- Release notes and history.
  README.md               <- Essential installation and usage guide.
  LibraryName.podspec     <- The podspec for the library.

  docs/                   <- In-depth technical documentation.
    TechnicalDoc1.md      <- Docs are written in Markdown.
    assets/               <- All documentation assets live here.
      image.png           <- Pngs, movs, gifs, etc...

  examples/
    Example.swift         <- Examples can be Swift,
    Example.h             <-                        or
    Example.m             <-                           Objective-C.
    supplemental/         <- Non-educational code used by the examples.
      SomeView.swift      <- Supplemental code can be Swift
      SomeView.h          <-                                or
      SomeView.m          <-                                   Objective-C.
    apps/                 <- Example applications live in this sub-directory.
      ExampleApp/         <- Example application.
      AnotherApp/         <- Another example application.
    resources/            <- Resources required by the examples.

  src/                    <- All library source lives here.
    LibraryName.h         <- Umbrella header.
    GOSObject.h           <- Library source must be written in Objective-C.
    GOSObject.m           
    private/              <- Private APIs live in a sub-directory
      GOSPrivateAPI.h
      GOSPrivateAPI.m
    LibraryName.bundle/   <- All assets required by the source.

  tests/
    interaction/          <- User interaction tests.
      SomeTest.swift      <- Tests can be Swift,
      AnotherTest.m       <-                     or Objective-C.
    unit/                 <- Unit tests.
      SomeTest.swift      <- Tests can be Swift,
      AnotherTest.m       <-                     or Objective-C.

Style conventions

GOS libraries use clang-format to automatically clean up stylistic aspects of the source. Place a copy of .clang-format at the root of the library tree.

There is a soft (aka: human-enforced) 100 character line length limit.

Jazzy

Your .jazzy.yaml file should contain the following information:

module: LibraryName
umbrella_header: src/LibraryName.h
objc: true
sdk: iphonesimulator

Travis CI

Your .travis.yml file should contain the following information:

language: objective-c
osx_image: xcode7.2
sudo: false
notifications:
  email: false
env:
  global:
  - LC_CTYPE=en_US.UTF-8
  - LANG=en_US.UTF-8
  matrix:
    - DESTINATION="OS=9.2,name=iPhone 6 Plus" SDK=iphonesimulator9.2
    - DESTINATION="OS=9.1,name=iPhone 6s" SDK=iphonesimulator9.2
    - DESTINATION="OS=9.0,name=iPhone 6 Plus" SDK=iphonesimulator9.2
    - DESTINATION="OS=8.4,name=iPhone 6" SDK=iphonesimulator9.2
    - DESTINATION="OS=8.3,name=iPhone 5S" SDK=iphonesimulator9.2
    - DESTINATION="OS=8.2,name=iPhone 5" SDK=iphonesimulator9.2
    - DESTINATION="OS=8.1,name=iPhone 4s" SDK=iphonesimulator9.2
before_install:
  - gem install cocoapods --no-rdoc --no-ri --no-document --quiet
  - gem install xcpretty --no-rdoc --no-ri --no-document --quiet
  - git submodule update
script:
  - set -o pipefail
  - xcodebuild -workspace examples/app/Example.xcworkspace -scheme Example -sdk "$SDK" -destination "$DESTINATION" -configuration Debug ONLY_ACTIVE_ARCH=NO build test | xcpretty -c;

Replace “Example” in the xcodebuild step with the name of an example app. Add one xcodebuild step for each example app.

Bootstrap script

The bootstrap script creates the skeletal directory structure for a GOS repo. This script must be provided a library name and a path.

Example usage:

# Create a new directory, ~/workbench/MyLibrary/, populated with the GOS conventional structure.
./bootstrap MyLibrary ~/workbench/