Sorry. I only saw the first part of the question and thought the OP was wondering what happened to DECLINE. As far as answering, I haven't had issue with swiping. I think another alternative to answering would be through Bluetooth.The OP asked if there was another way to answer a call. I am not aware of one. I am having the same issue to a degree. I am finding that the screen sensitivity seems worse overall with iOS7.
I am not having problems with answering calls, but typing at a high speed on the keyboard is a nightmare. I used to do it so easily on iOS 6, now, on iOS 7, I have to wait for 1 second after typing each word or else I see that half of the letters are missing even though I tapped on all letters.The OP asked if there was another way to answer a call. I am not aware of one.
I am having the same issue to a degree. I am finding that the screen sensitivity seems worse overall with iOS7.