How to animate UITableView header view

Question

I need to animate the insertion of a tableview header view. I want that the table rows to slide down while the header view expands its frame.
So far the best result I go

Answer 1

I found the definitive and proper way to achieve a real animation on tableHeaderViews!

• First, if you're in Autolayout, keep the Margin system inside your header view. With Xcode 8 its now possible (at last!), just do not set any constraint to any of the header subviews. You'll have to set the correct margins thought.

• Then use beginUpdates and endUpdates, but put endUpdate into the animation block.

// [self.tableView setTableHeaderView:headerView]; // not needed if already there
[self.tableView beginUpdates]; 
CGRect headerFrame = self.tableView.tableHeaderView.bounds;
headerFrame.size.height = PLAccountHeaderErrorHeight;

[UIView animateWithDuration:0.2 animations:^{
    self.tableView.tableHeaderView.bounds = headerFrame;

    [self.tableView endUpdates];
}];

Note: I only tried in iOS10, i'll post an update when my iOS9 simulator will be downloaded.

EDIT

Unfortunately, it doesn't work in iOS9 as well as iOS10: the header itself does not change its height, but header subviews seem to move as if the header bounds changed.