忽略文件

git是一种代码管理的方式；但是，并不是所有的代码都需要进行管理更新的，所以就会有一个配置文件，指明那些文件不需要git管控。
在git里，这个定义不管控的文件是一个隐藏文件.gitignore

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Object-C

各种语言的忽略文件内容不相同，在GitHub上有一个专门的项目，搜集了各种语言的忽略内容，非常好用Object-C忽略文件。一般情况下，直接用就可以了。比如Object-C的内容如下：

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

## User settings
xcuserdata/

## compatibility with Xcode 8 and earlier (ignoring not required starting Xcode 9)
*.xcscmblueprint
*.xccheckout

## compatibility with Xcode 3 and earlier (ignoring not required starting Xcode 4)
build/
DerivedData/
*.moved-aside
*.pbxuser
!default.pbxuser
*.mode1v3
!default.mode1v3
*.mode2v3
!default.mode2v3
*.perspectivev3
!default.perspectivev3

## Obj-C/Swift specific
*.hmap

## App packaging
*.ipa
*.dSYM.zip
*.dSYM

# 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/

Pod文件夹要忽略吗？

如果忽略，那么只保存了podfile，那么每个下载代码的人都需要执行pod install命令。
如果不忽略，那么Pod文件夹下的第三方库直接以代码的形式放在自己的git代码库中。普通开发者通过git下载之后，不需要进行任何pod相关操作，就可以直接编译运行工程。

两种选择都有各自的道理，也都有人在用。在这里，我选择第2种。pod相关操作只需要有一个人负责就行，其他人不需要知道。
默认提供的.gitignore文件也是选择第2种：

# 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