更新了Xcode 9.3 macOS 10.13.4后，在项目中多了 IDEWorkspaceChecks.plist 文件 增加了32位的警告 IDEDidComputeMac32BitWarning 的警告，表示开始弃用了32-bit的支持，请使用64-bit。

苹果官方文章是这样表述：

Xcode 9.3 adds a new IDEWorkspaceChecks.plist file to a workspace's shared data, to store the state of necessary workspace checks. Committing this file to source control will prevent unnecessary rerunning of those checks for each user opening the workspace. (37293167)

Resolved a performance issue when switching away from Issue Navigator into other Navigators, especially the Find Navigator. (35363603)

The source editor find and replace control now supports Full Keyboard Access. (33666790）

如在开发过程过遇到以下问题：

在代码检查时出现了该文件，可以选择删除或者提交都可以。