If you are developing an App with statistical function, like showing how many steps one have walked, use UIPickerView to scroll numbers from 0 to 7856(eg.) may be a good choice.
But The UIPickerView's animation is too fast, and you can't changed it without private API, here I am trying to show you a slow "numbers scroll" animation by a tricky (or hack?) method.
Enjoy :)
Xcode 7 + Swift 2