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I installed xcode 8.1 and the storyboard shows only blue lines, for all ui elements. If someone has figured it out.. let me know. I am unable to revert it to even Xcode 8.0
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Ok, So finally I too got the blue line problem in Xcode 8.1
Here is the screenshot
We can see something like
An internal error occurred. Editing functionality may be limitedand a Report a Bug button on right side.Don't know the reason why it happened. But I just quit Xcode and Simulator and again restarted it. That fixed and I got the UI elements back.
Don't worry revert back to old xcode
To remove the blue lines,
In Xcode, Go to Editor > Canvas > Show Bounds Rectangles
This will hide the blue lines
This has happened to me on several occasions. For me it almost always occurred after dragging a UILabel from a UITableView cell into a different view.
I was able to fix the problem by deleting the ViewController in the storyboard that I did the dragging to/from, closing the app, and reopening the project.
Seeing the blue rectangles is actually a feature of Xcode editor. You can turn this On/Off by going to Editor menu->Canvas->Show Bounds Rectangles
But yes, seeing just the blue boxes seems to be a bug. Usually happens if you have been switching between various versions of Xcode frequently. I guess quitting and reopening Xcode shall resolve this temporary issue.