TabBar issue on iOS 15

[HappyIosDeveloper]

The floating panel clips out the tab bar background then I move it down!

[scenee]

TabBar appearance has refined on iOS15. I confirmed the same issue in Samples app. To fix the clear background, I need to check 'Scroll Edge' of the tab bar in the storyboard or set a value to `UITabBar.scrollEdgeAppearance. As a result, the tab bar show as well as iOS 14 and below.
https://developer.apple.com/videos/play/wwdc2021/10059/
https://stackoverflow.com/questions/68688270/ios-15-uitabbarcontrollers-tabbar-background-color-turns-black

[amitpdev]

let appearance = UITabBarController().tabBar.standardAppearance
appearance.backgroundEffect = nil
        
if #available(iOS 15.0, *) {
    tabBarController.tabBar.scrollEdgeAppearance = appearance
    tabBarController.tabBar.standardAppearance = appearance
}