Swift plain style unsupported in a navigation item

Question

I am trying to animate my menu icon to when a user taps on the hamburger icon it will animate into a close icon.

So inside my navigation item I have a normal Bar button Item and inside that I have a UIView that I later animate.

But soon as I place the view inside the bar button item I get the warning: plain style unsupported in a navigation item

Everything still works fine but how can I fix this?

I have seen other apps doing it like I do. eg: this one

Thanks

Answer 1

So I found a solution.

If you set the bar button item to style > "bordered" the warning goes a away