Size Classes and the iPhone 6
So it’s great that the split view gives us one behavior for the iPad and another for the iPhone.
Except, well, that the iPhone 6-series devices are really big. Maybe not iPad big, but it at least makes you wonder whether it’s really appropriate to lump all iPhones together. After all, iOS 9 runs on everything from the 4s (with its 320×480, 3.5-inch screen) to the iPhone 6s Plus (414×736, 5.5-inch screen). Even within the iPhone range, there may be times we want to go to a side-by-side mode with our split view.
To do so, we need to understand how iOS represents screen sizes and their contents.
Size Classes
In iOS, screens, view controllers, and views all have a collection of sizing information called a trait collection ...
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