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Simplify your life: build apps from reusable libraries

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Julia Vashchenko C++ macOS developer

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

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Versus Quiz

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Versus Quiz

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Library Framework

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

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FRAMEWORK CONTROLS YOU

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Library Framework Technical difference

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Library Framework Technical difference

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Explicit Dependencies in Xcode Implicit

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Explicit Dependencies

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Implicit Dependencies

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Static Dynamic libraries

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Static Dynamic

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

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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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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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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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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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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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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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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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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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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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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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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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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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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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LLVM Clang

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compiler backend compiler frontend LLVM Clang

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C, C++, Objective-C, Objective-C++ LLVM Clang

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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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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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Compiling Linking

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Compiling Linking +

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Compiling Linking + Headers ↓

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Compiling Linking + Headers Object files ↓ ↓

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#include #import @import

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Modules

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What languages support modules?

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

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

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

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Swift module Clang module

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Swift module Clang module

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Swift module Clang module

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How to manage lib updates

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How to manage lib updates • do not manage

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

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

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

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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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CocoaPods Using Private&Local Pods

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

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Git Submodules

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Git Submodules

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Building Swift module in Xcode

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Building Swift module in Xcode

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Building Swift module without Xcode

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Building Swift module without Xcode

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Demo: Making & Using a Framework

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Troubleshooting common problems

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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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Thank you [email protected]