Question: When I first created my storyboard all the elements on each `UIViewController` showed up just fine; however, after opening up my storyboard again the view controllers have turned all blue. 

Is this some kind of issue with Xcode or is there a setting that turns my view controllers blue? 

I have checked each subview's `(UIViews, UIImageViews, etc.)` tint color and background color. 

[![Storyboard all blue](https://i.stack.imgur.com/tTfRl.png)](https://i.stack.imgur.com/tTfRl.png)

Answer: 
I think you have to tap each of them to give them the tabbar icon, then it will become normal
Rashwan [here](https://stackoverflow.com/questions/40248178/xcode-storyboard-is-masking-uitabbarcontroller-elements-with-blue-colour) says that having to add an image, while a good thing, is also a Xcode 8.0 bug that it turns your entire screen blue.

I added an image to the tab bar and it make my screen visible. However, the area where I added an image in the tab bar is now blue and it doesn't display properly when run on the simulator.

I think the solution is to upgrade Xcode past 8.0.