DisallowOverscroll not work on iOS device

I was building my first ionic v2 demo, the weird thing was that I can pull down NavBar or Tabbar to center of screen on real device, looks like DisallowOverscroll not work. I’ve googled around, tried to rm/add ios platform, tried to clean&rebuild the app, no help.

Here’s 2 snapshot, any idea? Thanks

Hi, I’ve noticed it happened on a page with side menu, is it bug for side menu?