Background doesn't dim as expected

[warpling]

Expected behavior:
The backdropView behind panels will dim or turn a translucent black.

Actual behavior:
The backdropView appears clear.

How to reproduce:
Run the stocks example. I tested on iOS 12 and 14.

Using: The latest copy of the repository as of July 30th 2020.

[warpling]

It turns out the dimming DOES work it just doesn't show up until the panel is nearly fully expanded. I think this also means that tap to dismiss does not work when a panel is at half height though as I am unable to get touch events when the panel is at half height but can at full height.

[jnwagstaff]

I experienced the same thing with .half, it seems like the backdrop view isn't there. If you implement the backdropAlpha function for the FloatingPanelLayout and return a value for .half it is present and tap to dismiss works again.

[WrathChaos]

@scenee, I think @jnwagstaff answer should be on README.

[scenee]

@WrathChaos I agree with you 👍 I will add an explanation about the backdrop alpha API.