I have classic TableView where you can delete item if you swipe and than clicking on the button. I know how to set custom background on the cell, but I can\'t find how I can
You could use UIButton.appearance to style the button inside the row action. Like so:
let buttonStyle = UIButton.appearance(whenContainedInInstancesOf: [YourViewController.self])
let font = UIFont(name: "Custom-Font-Name", size: 16.0)!
let string = NSAttributedString(string: "BUTTON TITLE", attributes: [NSAttributedString.Key.font : font, NSAttributedString.Key.foregroundColor : UIColor.green])
buttonStyle.setAttributedTitle(string, for: .normal)
Note: this will affect all of your buttons in this view controller.