…his will make the arrow centralized in the screen when there is no text.
This helps guarantee that all switch cases are properly handled. Assumed that SVPullToRefreshStateAll should be treated the same as SVPullToRefreshStateStopped in existing switch statements, since SVPullToRefreshStateAll is an invalid state for those. assert(NO) would also be appropriate. Turned on static analyzer since defining the SVPullToRefreshStateAll cases in existing switch statements fixed all analyzer warnings.
…nding of their font and text.