Because on an ipad, there is not a calculator, so swiping up does nothing, there's no calculator button to tap.

I've installed pcalc for this reason, and love it.

Why do I need Apple to make that decision for me?

Apple's claim that they're looking out for user experience might have been plausible in the early days of the app store but they've let so much shit through at this point it's hard to believe this is about anything more than then walling off yet another part of the OS for their exclusive use.

In any case I think anybody with half a clue can see that building a business on this kind of platform is extremely foolish.

Because swipe up is disabled on my lock screen! Airplane mode renders find my iPhone unusable.

PS-PCalc was the first notification center app I enabled on iOS 8 and I actually use it.

I wonder if this is a litmus test for rejecting CurrenC from the App Store for duplicating functionality that's already provided by iOS (Apple Pay). Have a go at the little guys, one of them bites with a lawsuit and Apple gets to duke it out in a fairly low-risk legal game.

Apples wins => likely to block CurrenC (and has a legal precedent for upcoming challenge)

Apple loses => unlikely to block CurrenC