title: How to check "global" position of object in ios
body: <p>I've got instance <code>taskView</code> of class which is sublcass of UIView. This instance is in <code>UIScrollView</code> which is at position (0, 50) and this <code>UIScrollView</code> is in self.view. The question is: how to check <code>taskView</code> position of screen? I want to check global position of this element. Elements like taskView are one or many in <code>UIScrollView</code>.</p>