I am developing an iOS app with Xcode 8 and Swift 3.
I have a tab bar controller with one tab view embedded in the navigation controller , as shown below:

As the project continues, the storyboard gets bigger. I really don't like it. So, I would like to divide it into several storyboards.
My question is:
How to split tab bar controller & related tab view controllers into multiple storyboards? What is the best way to do this? But how to do it?
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