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After I update to Xcode 10, The storyboard is acting very weird. Sometimes it's not showing anything for Identity, Attribute, Size, and Connection Inspector and even I clean the project also restart my Xcode and it's still the same. Here is an Image example: 
How to solve this problem?
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Open View -> Inspectors -> Select Show Attributes Inspector .
To fix the problem, we select the button we've added to the view, open the Identity Inspector by clicking the window icon at the top of the Xcode Utility area or by choosing View, Utilities, Show Identity Inspector (Option+Command+3), and then use the drop-down menu/field to enter the class that we really want ...
Depending on the type of object selected, the Inspector adapts its user interface to provide full access to the object's attributes. You can open the Inspector by clicking Window > Inspector in the main-menu, or by pressing Alt+I.
Recall that the Size inspector appears when you select the fifth button from the left in the inspector selector bar. It lets you edit the size and position of an object in your storyboard.
Alex Jackson's answer did not work for me. Try clicking on the 'Show Assistant Editor' button 
in the top right. That worked for me.
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Just select your storyboard tab, duplicate it (CMD+T) and close the first one. The new storyboard tab should work properly now.
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