1、忽略某个文件目录下面的修改可以
XXX文件 + / ：代表忽略掉此目录下的文件修改 例如：忽略以下三个文件下的修改
例如：
build/
!build/ExportOptions.plist
DerivedData/ （项目编译缓存文件）
# Xcode
# gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore
#生成的构建文件（项目编译的缓存文件,每次编译都会重新生成）
# Build generated
build/
!build/ExportOptions.plist
DerivedData/
#各种设置 （Xcode 使用这些文件来存储了用户对项目的偏好设置,跟踪打开了哪些文档、显示了哪些窗口、它们的大小以及项目的显示方式，且包含断点信息）
# Various settings
*.pbxuser
!default.pbxuser
*.mode1v3
!default.mode1v3
*.mode2v3
!default.mode2v3
*.perspectivev3
!default.perspectivev3
xcuserdata/
# Other
*.moved-aside
*.xccheckout
*.xcscmblueprint
.DS_Store
# Obj-C/Swift specific
*.hmap
*.ipa
*.dSYM.zip
*.dSYM
#pod文件的忽略处理
# 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/
# Add this line if you want to avoid checking in source code from the Xcode workspace
# *.xcworkspace
# Carthage
# Add this line if you want to avoid checking in source code from Carthage dependencies.
# Carthage/Checkouts
Carthage/Build
# 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/*/.png
fastlane/test_output
# Code Injection
# After new code Injection tools there's a generated folder /iOSInjectionProject
# https://github.com/johnno1962/injectionforxcode
iOSInjectionProject/
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