alertController with white borders

Question

I have created an alertcontroller with action sheet and two buttons. As the actionsheet will be having rounded edges, on the screen, on four corners, white color is appearing. I tried changing the background color of the alertcontroller, but that is making the action sheet to rectangular with sharp border instead of rounded borders. I tried setting the view background color to clear color Tried setting the border radius too. Here is my action sheet. I want those white edges invisible.

Also, how to change the background color of Cancel.

let cancelAction = UIAlertAction(title: "Cancel".localize(), style: .cancel) { _ in
    // this is where I am creating the cancelAction
}

Edit - 1 : Adding code for alertcontroller

func showActionSheet(_ changeAction: UIAlertAction) {
    let alertController = UIAlertController(title: "", message: "Here is my alert text".localize(), preferredStyle: .actionSheet)

    alertController.view.tintColor = StyleKit.goldenColor
    let attributedString = NSAttributedString(string: alertController.message!, attributes: [
        NSForegroundColorAttributeName : StyleKit.whiteColor
        ])
    alertController.setValue(attributedString, forKey: "attributedMessage")
    if let subview = alertController.view.subviews.first, let alertContentView = subview.subviews.first {
        for innerView in alertContentView.subviews {
            innerView.backgroundColor = StyleKit.popoverDefaultBackgroundColor

        }

    }
    let cancelAction = UIAlertAction(title: "Cancel".localize(), style: .cancel) { _ in
        self.doneButton.isEnabled = true
    }

    alertController.addAction(changeAction)
    alertController.addAction(cancelAction)
    self.present(alertController, animated: true)
}

Answer 1

here is the solution of this white border of UIAlertAction actionSheet

let actionSheet = UIAlertController.init(title: nil, message: nil, preferredStyle: .actionSheet)

if let subview = actionSheet.view.subviews.first, let actionSheet = subview.subviews.first {
    for innerView in actionSheet.subviews {
        innerView.backgroundColor = .purple
        innerView.layer.cornerRadius = 15.0
        innerView.clipsToBounds = true
    }
}

actionSheet.addAction(UIAlertAction.init(title: "Take Photo", style: UIAlertActionStyle.default, handler: { (action) in

}))
actionSheet.addAction(UIAlertAction.init(title: "Choose Photo", style: UIAlertActionStyle.default, handler: { (action) in

}))
actionSheet.addAction(UIAlertAction.init(title: "Cancel", style: UIAlertActionStyle.cancel, handler: { (action) in
}))

actionSheet.view.tintColor = .orange

self.present(actionSheet, animated: true, completion: nil)

Update with hex color

Github : https://github.com/BhaveshDhaduk/AlertControllerSwift