1，打开终端，cd到项目目录下
2，touch .gitignore 创建忽略文件
3，回到工程中shift+command+. 打开隐藏文件，找到.gitignore文件
4，打开.gitignore文件，编辑写入：
*.xcuserstate
project.xcworkspace
xcuserdata
UserInterfaceState.xcuserstate
project.xcworkspace/
xcuserdata/
UserInterface.xcuserstate
5，保存关闭.gitignore文件
6，退出Xcode，在终端输入 git rm --cached YourProjectName.xcworkspace/xcuserdata/YourUsername.xcuserdatad/UserInterfaceState.xcuserstate
7，在终端输入：git commit -m"Removed file that shouldn't be tracked"
8，重新打开Xcode，git commit ，git push
