Do you sometimes you want to change the title of a text-only UIButton while it is on the screen and the text flashes? The easiest way to fix that is to use the .custom button type instead of .system.

Here's some playground code to illustrate this:

import UIKit
import PlaygroundSupport

let view = UIView()
view.backgroundColor = .green
view.frame = CGRect(x: 0, y: 0, width: 200, height: 300)
let b = UIButton(type: .system) //Switch to .custom
b.frame = CGRect(x: 10, y: 10, width: 70, height: 24)
b.setTitle("foo", for: .normal)
b.setTitleColor(.red, for: .normal)
view.addSubview(b)

PlaygroundPage.current.liveView = view

DispatchQueue.main.asyncAfter(deadline: .now() + 2) {
    b.setTitle("bar", for: .normal)
}