1> 退出 Xcdoe，打开终端（Terminal），进入到你的项目目录下。

2> 在终端键入  git rm --cached <YourProjectName>.xcodeproj/project.xcworkspace/xcuserdata/<YourUsername>.xcuserdatad/UserInterfaceState.xcuserstate

        终端返回：rm 'QFormDataExample.xcodeproj/project.xcworkspace/xcuserdata/JHQ0228.xcuserdatad/UserInterfaceState.xcuserstate'

3> 提交更新，在终端键入  git commit -m "Removed file that shouldn't be tracked"

        终端返回：<master 734ff0a> Removed file that shouldn't be tracked
                 1 file changed, 0 insertions(+), 0 deletions(-)
                 delete mode 100644 QFormDataExample.xcodeproj/project.xcworkspace/xcuserdata/JHQ0228.xcuserdatad/UserInterfaceState.xcuserstate

4> 在 .gitignore 文件中加入如下几行，或者在 GitHub Desktop 中右击 UserInterfaceState.xcuserstate 更新，选择 Ignore all .xcuserstate files

        *.xcuserstate
        project.xcworkspace
        xcuserdata
        UserInterfaceState.xcuserstate
        project.xcworkspace/
        xcuserdata/
        UserInterface.xcuserstate

5> 提交更新，重新打开 Xcode commit, push。

然后出现如下图所示的.gitignore文件

我们需要点击左侧的小方框勾选add进来

然后commit提交到本地仓库，最后push到远程仓库

然后重新打开Xcode