This is fairly normal for an Xcode installation and normally when you exit iTunes the installation continues.
对于X code的安装来说，这是非常正常的，当你退出itunes之后，安装过程就会正常地继续下去。
Once the setup has completed, choose Finish to exit the installation panel.
完成设置后，选择Finish退出安装面板。
An exit program is typically used for any post-configuration required following the product installation, and can be used to determine if the installation of the solution is successful.
出口程序(exit program)通常用于在产品安装之后执行所需的任何后期配置，可用于确定解决方案的安装是否成功。
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