& git rm --cached 项目名称.xcodeproj/project.xcworkspace/xcuserdata/电脑用户名.xcuserdatad/UserInterfaceState.xcuserstate & git commit -m "Removed file that shouldn‘t be tracked"
iOS开发：告诉git不要跟踪UserInterfaceState.xcuserstate
原文：http://www.cnblogs.com/tonge/p/5239420.html