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.
In Xcode: Editor > canvas > show bounds rectangles. This option show/hide the blue lines. If you found this one not work first time, try twice toggling the show bounds rectangles option.
You have SwiftUI enabled in your project, which does not use storyboards anymore. Your layout is inside the ContentView. swift file. If you do want to work the old way, with storyboards, you should uncheck 'Use SwiftUI' in the project creation screen.
To get this, open the storyboard, click the 'assistant' editor, click the 'assistant editor menu button' (immediately to the right of the > arrow at the top left of the assistant window) and select Preview.
Don't worry revert back to old xcode
To remove the blue lines,
First, select a view controller in the storyboard.
Then, go to Editor > Canvas > Show Bounds Rectangles
This will hide the blue lines.
You may have to repeat this 2 or 3 times to make it work.
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