The example of .gitignore file.

.gitignore

# Xcode
#
# gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore

## Ignore Mac DS_Store files
.DS_Store

## Build generated
build/
DerivedData/

## Various settings
*.pbxuser
!default.pbxuser
*.mode1v3
!default.mode1v3
*.mode2v3
!default.mode2v3
*.perspectivev3
!default.perspectivev3
xcuserdata/

## Other
*.moved-aside
*.xcuserstate

## App Code
.idea/

## Obj-C/Swift specific
*.hmap
*.ipa

# Bundler
.bundle

Carthage
*.framework.zip

# We recommend against adding the Pods directory to your .gitignore. However
# you should judge for yourself, the pros and cons are mentioned at:
# http://guides.cocoapods.org/using/using-cocoapods.html#should-i-ignore-the-pods-directory-in-source-control
# 
# Note: if you ignore the Pods directory, make sure to uncomment
# `pod install` in .travis.yml
#
Pods/

*.gem
*.rbc
/.config
/coverage/
/InstalledFiles
/pkg/
/spec/reports/
/test/tmp/
/test/version_tmp/
/tmp/

## Specific to RubyMotion:
.dat*
.repl_history
build/

## Documentation cache and generated files:
/.yardoc/
/_yardoc/
/doc/
/rdoc/

## Environment normalisation:
/.bundle/
/vendor/bundle
/lib/bundler/man/

# for a library or gem, you might want to ignore these files since the code is
# intended to run in multiple environments; otherwise, check them in:
# Gemfile.lock
# .ruby-version
# .ruby-gemset

# unless supporting rvm < 1.11.0 or doing something fancy, ignore this:
.rvmrc

# fastlane temporary profiling data
/fastlane/report.xml
# deliver temporary error output
/fastlane/Error*.png
# deliver temporary preview output
/fastlane/Preview.html
# snapshot generated screenshots
/fastlane/screenshots/*/*-portrait.png
/fastlane/screenshots/*/*-landscape.png
/fastlane/screenshots/screenshots.html
# frameit generated screenshots
/fastlane/screenshots/*/*-portrait_framed.png
/fastlane/screenshots/*/*-landscape_framed.png
# private envs
/fastlane/.env*private*
# output files
fastlane/test-output
fastlane/README.md