This link is not use full for me : The document Main.storyboard requires Xcode 8.0 or later
It's possible to do this, but I would be wary about doing so. You can find information here: http://radex.io/xcode7-xcode8/
Go through all of your .xib and .storyboard files, open the right sidebar, go to the first (File inspector) tab, and find the “Opens in” setting.
It will most likely say “Default (7.0)”. Change it to “Xcode 7.0”. This will ensure that even if you touch the file in Xcode 8, it will only make changes that are backwards-compatible with Xcode 7.