自由形式子视图的宽度不会扩展到设备屏幕尺寸

Question

I'm trying to add a music miniplayer view controller to a container UITabBarVC. The music miniplayer view controller is a freeform storyboard file. I am implementing the file as follows:

 self.miniPlayerViewController = self.storyboard?.instantiateViewController(with: MiniPlayerViewController.identifier)
 self.miniPlayerViewController.view.frame = CGRect(x: 0, y: self.customBottomOffset, width: UIScreen.main.bounds.width, height: 92)

This exists in a function which I execute in viewDidLoad().

On larger devices, such as an iPhone 8 Plus (below), the miniplayer doesn't expand to fit the screen's width despite me using UIScreen.main.bounds.width as the width parameter. Any suggestions on how to fix this?

Update Tried setting View width to Now Playing View width, but didn't help the situation.

Answer 1

Turns out that this was due to how I was rounding the corners of the miniplayer. Guess executing this code under didSet did not allow the view to actually register the size of the screen:

    @IBOutlet weak var nowPlayingView: UIView! {
    didSet {
        nowPlayingView.roundCorners(corners: [.topLeft, .topRight], radius: 20.0)
    }
}

I would appreciate if anyone could please explain this further.