| ### Tracking a parent view |
| |
| While we do not recommend it, there are situations in which the trackingScrollView will be the |
| parent view of the flexible header's view. The most notable example is UITableViewController, whose |
| `view` **is** the UITableView instance, so there is no other view to register the tracking scroll |
| view to. |
| |
| As you might expect, this situation causes the flexible header to scroll off-screen with the scroll |
| view regardless of the flexible header's scrolling behavior. To counter this, the flexible header |
| sets its `transform` to an inversion of the current `contentOffset`. This gives the illusion of |
| the flexible header staying fixed in place, even though the underlying scroll view is scrolling. |
| |
| In these situations the flexible header also ensures that it is always the front-most view. This is |
| to combat the UITableView displaying its divider lines in front of the flexible header. |
