Hack: Always call the subview’s viewWillAppear, viewWillDisappear, etc.
Hack: Always call the subview’s viewWillAppear, viewWillDisappear, etc.

This disables the [UIView _needsDidAppearOrDisappear] by always making
it equal YES. To be honest, I don’t understand what its purpose is, but
this appears to cause no side effects.

jterhorst/Chameleon