I am having the weirdest of problems with a today widget on iOS.
I have a simple widget with a table view like this: https://grab.edr.io/2e557aa43a34b7460b1eac44cbca
Using the workaround of a background view with a white background color and alpha of 0.01 causes a slightly visible border on iPads where the notification center doesn't cover the whole screen, especially on the right edge of the table view.
Another workaround without this visual glitch is to use a UILabel as the cell's backgroundView. The label needs no text or background color.
self.backgroundView = [UILabel new];