git中忽略UserInterfaceState.xcuserstate

1.UserInterfaceState.xcuserstate是什么？

该文件为xcode默认自带文件，是xcode的配置信息，git会用这个文件记录下来。
比如：手动删除此文件，退出xcode后重启xcode，此文件会自动创建并跟踪

  结论：此文件无需push，应忽略

2.使用.gitignore忽略无效，如何解决？

终端输入以下指令：

  git rm --cached 此处填写你的工程名称.xcodeproj/project.xcworkspace/xcuserdata/此处填写你的用户名称.xcuserdatad/UserInterfaceState.xcuserstate
  git commit -m "Removed file that shouldn't be tracked"    
  git push

注意：
执行以上三条指令有以下两个前提

• 得先在工程目录（和.git仓库同路径的目录下）配置有 .gitignore 文件，它才能生效！
  1.先创建touch .gitignore，
  2.打开open .gitignore，

  *.xcuserstate  
  project.xcworkspace  
  xcuserdata  
  UserInterfaceState.xcuserstate  
  project.xcworkspace/  
  xcuserdata/  
  UserInterface.xcuserstate  
  
  3.将上面内容粘贴进去，
  4.保存关闭，
  5.添加到缓存区，git add .gitignore
  6.提交git commit -m "添加了.gitignore文件"
  7.推送git push    
  

配置完.gitignore文件后，注意下面一个前提

• 要进入该工程的路径中，也就是.xcodeproj的上一级，否则会出现以下错误
  fatal: path spec 'ProjectFolder.xcodeproj/project.xcworkspace/xcuserdata/myUserName.xcuserdatad/UserInterfaceState.xcuserstate' did not match any files

满足以上两个前提后，执行以上三条指令即可

参考资料及链接：

This helped me: 1) quit xcode; 2) go to the project directory and do an "ls -la" from the terminal app to make sure you see the .git and .gitignore files; 3) change "ProjectFolder" in the example above to the name of your project; 4) do the two git commands that matt shows; 5) Relaunch XCode and do a commit and verify that the xcuserstate file is no longer listed.
https://stackoverflow.com/questions/6564257/cant-ignore-userinterfacestate-xcuserstate
http://www.jianshu.com/p/6f464f555f2d