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在開發中，項目中會產生一些我們不希望提交到Git的個人信息或配置的文件，現使用.gitignore文件忽略掉。
Step 1: 進入項目目錄：cd ?<ProjectName>
Step 2: 查看狀態： git? stauts
Step 3: 創建gitignore文件：touch? .gitignore? ? #創建隱藏文件gitignore
Step 4: 編輯gitignore文件： vim? ? .gitignore? ? #編輯該文件,下附內容，知道Vim基本命令
Step 5: Git添加.gitignore文件： git add .gitignore
Step 6: 現在可以再查看結果狀態： git? stauts
附：
# ---> Objective-C
# 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
*.xccheckout
*.moved-aside
*.xcuserstate
*.xcscmblueprint
## Obj-C/Swift specific
*.hmap
*.ipa
# CocoaPods
#
# 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-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/Build
