打开使用xcode 8创建的情节提要时，xcode 9崩溃

Question

xcode 9 crashes 100% of the time while opening a storyboard created by xcode 8 on high sierra. This happens on every project.

Error message was : "There can only be one document registered with a given URL"

Answer 1

The fix for me was to :

• Cleaning build folder
• Clean, delete derived data
• Delete saved state
• Reboot with reopening windows
• Create new single view application
• Open storyboard.

Now you should be able to open your storyboards again

Answer 2

创建一个新的单视图应用程序，在此处打开情节提要，然后返回到原始项目，它应该可以工作。