Warning frame for “Navigation bar” will be different at run time appears in Xcode 8 Swift 3

Question

Before I\'ve upgraded to Xcode 8 I haven\'t seen this error in such case. I have different Navigation Controllers. For all of them I see an error Frame fo

Answer 1

I have changed from View as: iPhone 6S to iPhone 5S, then changed back to iPhone 6S, and Xcode did all the changes to remove the warning.