Simplify your life: build apps from reusable libraries

Originally posted here: https://speakerdeck.com/vashchenko/simplify-your-life-build-apps-from-reusable-libraries

Доклад включает в себя:
- Удобная организация кода в библиотеки
- Переиспользование библиотек - как это ускоряет разработку и делает вашу работу более продуктивной
- Live coding: как создать библиотеку на Swift c нуля

This talk was made for CocoaHeads Kyiv #14 which took place Oct 6 2018.

Transcript

1. Simplify your life:
   build apps from reusable libraries
   

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2. Julia Vashchenko
   C++ macOS developer
   

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3. –Steve McConnell, 'Code Complete'
   “Managing complexity is the most important
   technical topic in software development.”
   

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7. Versus
   Quiz
   

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8. Versus
   Quiz
   

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9. Library
   Framework
   

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11. Inversion of Control
    Conceptual difference
    Martin Fowler on Frameworks and Inversion of Control:
    

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16. FRAMEWORK CONTROLS YOU
    

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17. Library Framework
    Technical difference
    

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18. Library Framework
    Technical difference
    

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19. Explicit
    Dependencies in Xcode
    Implicit
    

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20. Explicit Dependencies
    

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21. Implicit Dependencies
    

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22. Static Dynamic
    libraries
    

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23. Static Dynamic
    

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24. Static Dynamic
    File extension
    .a on Linux, macOS, iOS
    .lib on Windows
    

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25. Static Dynamic
    File extension
    .a on Linux, macOS, iOS
    .lib on Windows
    .dylib on macOS, iOS
    .so on Linux
    .dll on Windows
    

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26. Static Dynamic
    File extension
    .a on Linux, macOS, iOS
    .lib on Windows
    .dylib on macOS, iOS
    .so on Linux
    .dll on Windows
    Compilation INTO binary
    

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27. Static Dynamic
    File extension
    .a on Linux, macOS, iOS
    .lib on Windows
    .dylib on macOS, iOS
    .so on Linux
    .dll on Windows
    Compilation INTO binary OUTSIDE the binary
    

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28. Static Dynamic
    File extension
    .a on Linux, macOS, iOS
    .lib on Windows
    .dylib on macOS, iOS
    .so on Linux
    .dll on Windows
    Compilation INTO binary OUTSIDE the binary
    Binary Size bigger
    

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29. Static Dynamic
    File extension
    .a on Linux, macOS, iOS
    .lib on Windows
    .dylib on macOS, iOS
    .so on Linux
    .dll on Windows
    Compilation INTO binary OUTSIDE the binary
    Binary Size bigger smaller
    

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30. Static Dynamic
    File extension
    .a on Linux, macOS, iOS
    .lib on Windows
    .dylib on macOS, iOS
    .so on Linux
    .dll on Windows
    Compilation INTO binary OUTSIDE the binary
    Binary Size bigger smaller
    Application Load Time slower
    

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31. Static Dynamic
    File extension
    .a on Linux, macOS, iOS
    .lib on Windows
    .dylib on macOS, iOS
    .so on Linux
    .dll on Windows
    Compilation INTO binary OUTSIDE the binary
    Binary Size bigger smaller
    Application Load Time slower faster
    

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32. Static Dynamic
    File extension
    .a on Linux, macOS, iOS
    .lib on Windows
    .dylib on macOS, iOS
    .so on Linux
    .dll on Windows
    Compilation INTO binary OUTSIDE the binary
    Binary Size bigger smaller
    Application Load Time slower faster
    Binding Symbols at link time
    

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33. Static Dynamic
    File extension
    .a on Linux, macOS, iOS
    .lib on Windows
    .dylib on macOS, iOS
    .so on Linux
    .dll on Windows
    Compilation INTO binary OUTSIDE the binary
    Binary Size bigger smaller
    Application Load Time slower faster
    Binding Symbols at link time at run time
    

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34. Static Dynamic
    File extension
    .a on Linux, macOS, iOS
    .lib on Windows
    .dylib on macOS, iOS
    .so on Linux
    .dll on Windows
    Compilation INTO binary OUTSIDE the binary
    Binary Size bigger smaller
    Application Load Time slower faster
    Binding Symbols at link time at run time
    Library Update Mechanism rebuild host application
    

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35. Static Dynamic
    File extension
    .a on Linux, macOS, iOS
    .lib on Windows
    .dylib on macOS, iOS
    .so on Linux
    .dll on Windows
    Compilation INTO binary OUTSIDE the binary
    Binary Size bigger smaller
    Application Load Time slower faster
    Binding Symbols at link time at run time
    Library Update Mechanism rebuild host application updates separately
    

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36. Static Dynamic
    File extension
    .a on Linux, macOS, iOS
    .lib on Windows
    .dylib on macOS, iOS
    .so on Linux
    .dll on Windows
    Compilation INTO binary OUTSIDE the binary
    Binary Size bigger smaller
    Application Load Time slower faster
    Binding Symbols at link time at run time
    Library Update Mechanism rebuild host application updates separately
    Usage in Playgrounds can't be used
    

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37. Static Dynamic
    File extension
    .a on Linux, macOS, iOS
    .lib on Windows
    .dylib on macOS, iOS
    .so on Linux
    .dll on Windows
    Compilation INTO binary OUTSIDE the binary
    Binary Size bigger smaller
    Application Load Time slower faster
    Binding Symbols at link time at run time
    Library Update Mechanism rebuild host application updates separately
    Usage in Playgrounds can't be used is used
    

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39. LLVM Clang
    

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40. compiler backend compiler frontend
    LLVM Clang
    

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41. C, C++, Objective-C, Objective-C++
    LLVM Clang
    

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42. ActionScript, Ada, C, C#, C++, Common Lisp,
    Crystal, CUDA, D, Delphi, Fortran, Graphical G
    Programming Language, Halide, Haskell, Java
    bytecode, Julia, Kotlin, Lua, Objective-C,
    OpenGL Shading Language, Pony, Python, R,
    Ruby, Rust, Scala, Swift, Xojo
    LLVM Clang
    C, C++, Objective-C, Objective-C++
    

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43. ActionScript, Ada, C, C#, C++, Common Lisp,
    Crystal, CUDA, D, Delphi, Fortran, Graphical G
    Programming Language, Halide, Haskell, Java
    bytecode, Julia, Kotlin, Lua, Objective-C,
    OpenGL Shading Language, Pony, Python, R,
    Ruby, Rust, Scala, Swift, Xojo
    LLVM Clang
    C, C++, Objective-C, Objective-C++
    

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44. Compiling Linking
    

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45. Compiling Linking
    +
    

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46. Compiling Linking
    +
    Headers
    ↓
    

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47. Compiling Linking
    +
    Headers Object files
    ↓ ↓
    

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48. #include
    #import
    @import
    

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49. Modules
    

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50. What languages support
    modules?
    

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51. C++
    Ada
    Julia
    Swift
    JavaScript
    Objective-C
    Python IBM/360 Assembler
    Perl
    C#
    Haskell
    Ruby
    Pascal
    Turbo Pascal
    Clojure
    Java
    

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52. C++
    Ada
    Julia
    Swift
    JavaScript
    Objective-C
    Python IBM/360 Assembler
    Perl
    C#
    Haskell
    Ruby
    Pascal
    Turbo Pascal
    Clojure
    Java
    

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53. C++
    Ada
    Julia
    Swift
    JavaScript
    Objective-C
    Python IBM/360 Assembler
    Perl
    C#
    Haskell
    Ruby
    Pascal
    Turbo Pascal
    Clojure
    Java
    

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54. Swift
    module
    Clang
    module
    

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55. Swift
    module
    Clang
    module
    

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56. Swift
    module
    Clang
    module
    

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57. How to manage lib updates
    

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58. How to manage lib updates
    • do not manage
    

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59. How to manage lib updates
    • do not manage
    • via Swift Package Manager: depend on private repo
    

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60. How to manage lib updates
    • do not manage
    • via Swift Package Manager: depend on private repo
    • via CocoaPods: Private Pod
    

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61. How to manage lib updates
    • do not manage
    • via Swift Package Manager: depend on private repo
    • via CocoaPods: Private or Local Pod
    • via Git Submodule
    

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62. Swift Package Manager
    Using GitHub Deploy Key
    Package.swift:
    Type in Terminal:
    

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63. Swift Package Manager
    Using GitHub Deploy Key
    Config file contents:
    GitHub.com → Your Profile → Repositories → Settings → Deploy Keys → Add deploy key →
    paste public key → check ‘Allow write access’
    

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64. CocoaPods
    Using Private&Local Pods
    

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65. CocoaPods
    Using Private&Local Pods
    17:30
    Modularizing your iOS apps
    

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66. Git Submodules
    

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67. Git Submodules
    

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68. Building Swift module
    in Xcode
    

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69. Building Swift module
    in Xcode
    

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70. Building Swift module
    without Xcode
    

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71. Building Swift module
    without Xcode
    

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72. Demo:
    Making & Using a
    Framework
    

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73. Troubleshooting
    common problems
    

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74. Error type Check:
    Compilation error HEADER_SEARCH_PATHS
    Xcode doesn’t build subproject Implicit Dependencies in ‘Schemes’ should be checked
    Linker error
    1. Is there a function with exact name?
    2. Is is implemented?
    Xcode can’t find a built library LIBRARIES_SEARCH_PATHS
    Static library doesn’t work for simulator Use lipo tool to add missing architecture
    

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75. Thank you
    jula.vashchenko@yahoo.com
    

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