setup gitignore_global for Xcode

.gitignore_global

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

## Build generated
build/
DerivedData/

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

## Other
*.moved-aside
*.xccheckout
*.xcscmblueprint

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

## Playgrounds
timeline.xctimeline
playground.xcworkspace

# Swift Package Manager
#
# Add this line if you want to avoid checking in source code from Swift Package Manager dependencies.
# Packages/
# Package.pins
# Package.resolved
.build/

# CocoaPods
#
# We recommend against adding the Pods directory to your .gitignore. However
# you should judge for yourself, the pros and cons are mentioned at:
# https://guides.cocoapods.org/using/using-cocoapods.html#should-i-check-the-pods-directory-into-source-control
#

Pods/

# Carthage
#
# Add this line if you want to avoid checking in source code from Carthage dependencies.
# Carthage/Checkouts

Carthage/

# fastlane
#
# It is recommended to not store the screenshots in the git repo. Instead, use fastlane to re-generate the
# screenshots whenever they are needed.
# For more information about the recommended setup visit:
# https://docs.fastlane.tools/best-practices/source-control/#source-control

fastlane/report.xml
fastlane/Preview.html
fastlane/screenshots
fastlane/test_output

# OS X temporary files that should never be committed

.DS_Store
*.swp
*.lock
*.xcworkspace/xcshareddata/

Installing .gitignore_global

• create a hidden file called .gitignore_global in your the root of your user folder (if it doesn't exist) using the terminal, like this:

    touch .gitignore_global
  

• open .gitignore_global in a text editor.

• copy the above script into .gitignore_global and save the file.

• setup your .gitconfig file to use this file by running the following command:

  git config --global core.excludesfile ~/.gitignore_global
  

• your global gitignore file should now apply to all new repos you create.

• if you have an existing repo run the following commands to force it to comply with this global gitignore file:

  git rm -r --cached .
  

• You will have to add and commit all files after deleting the cache.

• Note if you're working with others always use a local gitignore file on your repo.