'Improving Xcode build time​' by Sameh Mabrouk

Sameh will describe few things:
- The problem of relatively high build times with CocoaPods
- How to deal with it
- How to handle it
- What Swift issues may arise while customizing your build process

This talk was made for CocoaHeads Kyiv #13 which took place Dec 16 2017.

Transcript

1. IMPROVING XCODE BUILD TIME One Approach 2017-Sameh Mabrouk, Mobiquity - @same7mabrouk
2. INDEX Problem Solutions/Approaches Demo Result References
3. INDEX Problem Solutions/Approaches Demo Result References
4. Our App build time takes around 7-10 minutes on local machine 20-30 minuts on CI
5. Hard to do TDD(good excuse) Slow the development process
6. INDEX Problem Solutions/Approaches Demo Result References
7. Optimisation on code level More class extensions increase build time Type inference, Swift takes more time to infers the types
8. Dependency management Change debug information formate to “DWARF” post_install do |installer| puts("Update debug pod settings to speed up build time") Dir.glob(File.join("Pods", "**", "Pods*{debug}.xcconfig")).each do |file| File.open(file, 'a') { |f| f.puts "\nDEBUG_INFORMATION_FORMAT = dwarf" } end end
9. Dependency management Change debug information formate to “DWARF” post_install do |installer| puts("Update debug pod settings to speed up build time") Dir.glob(File.join("Pods", "**", "Pods*{debug}.xcconfig")).each do |file| File.open(file, 'a') { |f| f.puts "\nDEBUG_INFORMATION_FORMAT = dwarf" } end end simply changing one option in Xcode reduced the waiting time in 25 seconds: nice!
10. Dependency management (CocoaPods)
11. Dependency management (CocoaPods) Using Binaries/Frameworks instead of source code of dependencies
12. Demo
13. How to use Framework with CocoaPods vendored_frameworks
14. How to use Framework with CocoaPods Update pod spec Add binary/framework to your remote repo Pod install - to get the framework
15. Example1: Podspec Pod::Spec.new do |s| s.name = 'ObjectMapper' s.version = '2.2.8' s.license = 'MIT' s.summary = 'JSON Object mapping written in Swift' s.homepage = 'https://github.com/Hearst-DD/ObjectMapper' s.authors = { 'Tristan Himmelman' => 'tristanhimmelman@gmail.com' } s.source = { :git => 'https://github.com/Hearst-DD/ObjectMapper.git', :tag => s.version.to_s } s.watchos.deployment_target = '2.0' s.ios.deployment_target = '8.0' s.osx.deployment_target = '10.9' s.tvos.deployment_target = '9.0' s.pod_target_xcconfig = { 'SWIFT_VERSION' => '3.1', } s.requires_arc = true s.ios.vendored_frameworks = 'framework/ObjectMapper.framework' end
16. Example2: subspecs Pod::Spec.new do |s| s.name = 'BananaLib' s.version = '1.0' s.author = 'Banana Corp' s.license = 'Proprietary' s.homepage = 'http://banana-corp.local/banana-lib.html' s.summary = 'Chunky bananas!' s.default_subspec = 'Source' s.subspec 'Source' do |source| source.source = { :git => 'http://banana-corp.local/banana-lib.git', :tag => 'v1.0' } source.source_files = '**/*.swift' end s.subspec 'Binary' do |binary| binary.source = { :http => 'http://banana-corp.local/banana-framework.zip' } binary.vendored_frameworks = 'BananaFramework.framework' end end
17. Add framework to remote repo
18. Add framework to remote repo
19. Automation?
20. Shell script!!!, i don’t know?
21. Let’s give it a try…
22. #!/bin/bash # clonning remote git repo function lazyclone { url=$1" "$2" "$3; echo $url reponame=$(echo $url | awk -F/ '{print $NF}' | sed -e 's/.git$//'); echo $reponame git clone $url $reponame; cd $reponame; } lazyclone $1" "$2" "$3 # using carthage to create dynamic framework from .xcodeproj carthage build --no-skip-current cd "Carthage/Build/iOS" # Go back to repo main directory cd .. cd .. cd .. # Create a directory called framework that hold the binary mkdir framework # Copy .framework from Carthage/Build/iOS directory to framwork directory cp -R ${PWD}/Carthage/Build/iOS/$reponame.framework ${PWD}/framework cp -R ${PWD}/Carthage/Build/iOS/$reponame.framework.dSYM ${PWD}/framework # Change .podspec so it should contain s.ios.vendored_frameworks sed -i '' '/source_files/c\ s.source_files = '"'""'"' $'\n'' ./${reponame}.podspec sed -i '' '/end/i\ s.ios.vendored_frameworks = '"'"framework/${reponame}.framework"'"' $'\n'' ./${reponame}.podspec # Remove Carthage directory rm -r Carthage # Commit and push .podspec and framework to remote repo function lazyPush() { git add . git commit -a -m "$1" git push } lazyPush "Change pod spec to support dynamic framework + add dynamic framework" echo "Done!" echo "Now you have a framework for this dependency, just do pod install in your project to use it" echo "Have a good day!"
23. Result Our project build time decreased by 2 minutes. From 7 minutes to 5 minutes
24. Conclusion Optimizing your building process truly pays off.
25. Conclusion It only requires spending some time on it once in a while, ideally only costing a few hours every few months.
26. Conclusion It saves a considerable amount of time and money.
27. Conclusion But, most importantly, it will make developers happier.
28. Conclusion Engineering work, so it’s fun to do.
29. References https://medium.com/@RobertGummesson/regarding-swift-build-time- optimizations-fc92cdd91e31 https://medium.com/@RobertGummesson/regarding-swift-build-time- optimizations-fc92cdd91e31 https://github.com/RobertGummesson/BuildTimeAnalyzer-for-Xcode https://jobs.zalando.com/tech/blog/speeding-up-xcode-builds/? gh_src=4n3gxh1 https://jobs.zalando.com/tech/blog/how-the-zalando-ios-app-abandoned- cocoapods-and-reduced-build-time/?gh_src=4n3gxh1