进入项目目录:
git rm --cached ProjectName.xcodeproj/project.xcworkspace/xcuserdata/username.xcuserdatad/UserInterfaceState.xcuserstate
git commit -m "Removed file that shouldn‘t be tracked"
提交代码, 经常出现工作副本“项目”有未提交的更改 The working copy "Project" has uncommitted changes.
原文：http://blog.csdn.net/alincexiaohao/article/details/39525135
