Imitate Facebook hide/show expanding/contracting N

Question

In the new iOS7 Facebook iPhone app, when the user scrolls up the navigationBar gradually hides itself to a point where it completely vanishes. Then when the user scrolls down the navigationBar gradually shows itself.

How would you implement this behavior yourself? I am aware of the following solution but it disappears right away and it isn't tied to the speed of the user's scroll gesture at all.

[navigationController setNavigationBarHidden: YES animated:YES];

I hope this isn't a duplicate as I'm not sure how best to describe the "expanding/contracting" behavior.

Answer 1

EDIT: Only for iOS 8 and above.

You can try use

self.navigationController.hidesBarsOnSwipe = YES;

Works for me.

If your coding in swift you have to use this way (from https://stackoverflow.com/a/27662702/2283308)

navigationController?.hidesBarsOnSwipe = true