Was wondering how I would go about flicking or flinging a UIView, such as http://www.cardflick.co/ or https://squareup.com/cardcase demo videos.
I know how to drag items, but how do you give them gravity/inertia. Is this handled by IOS?
There's nothing built into iOS that does this for you, but you could easily implement it yourself. I'd start by creating a gesture recognizer that recognizes the "flick" gesture that you want to use, possibly something that looks for constant direction and increase in velocity. When you recognize such a gesture, you just have to animate the affected view's position appropriately.