Buttons.swift

private func configurations(forStyleIndex index: Int) -> [UIButton.Configuration] {
  var configuration1 = UIButton.Configuration.filled()
  configuration1.title = "Filled"      
  var configuration2 = UIButton.Configuration.tinted()
  configuration2.title = "Tinted"      
  var configuration3 = UIButton.Configuration.gray()
  configuration3.title = "Gray"
  var configuration4 = UIButton.Configuration.plain()
  configuration4.title = "Plain"
  var configuration5 = UIButton.Configuration.bordered()
  configuration5.title = "Bordered"
  var configuration6 = UIButton.Configuration.borderedProminent()
  configuration6.title = "Bordered Prominent"      
  var configuration7 = UIButton.Configuration.borderedTinted()
  configuration7.title = "Bordered Tinted"
  var configuration8 = UIButton.Configuration.borderless()
  configuration8.title = "Borderless"
        
  let all: [UIButton.Configuration] = [configuration1, configuration2, configuration3, configuration4, configuration5, configuration6, configuration7, configuration8]
    .map({ original in
      var configuration = original
      switch index {
      case 0:
        break
      case 1:
        configuration.subtitle = "Subtitle"
      case 2:
        configuration.image = UIImage(systemName: "pencil")
      case 3:
        configuration.buttonSize = .large
      case 4:
        configuration.image = UIImage(systemName: "pencil")
        configuration.imagePlacement = .trailing
      case 5:
        configuration.baseBackgroundColor = .systemBlue
      case 6:
        configuration.buttonSize = .mini
      case 7:
        configuration.showsActivityIndicator = true
      case 8:
        configuration.baseBackgroundColor = .systemCyan
        configuration.buttonSize = .large
        configuration.cornerStyle = .dynamic
        configuration.showsActivityIndicator = false
        configuration.image = UIImage(systemName: "pencil")
        configuration.imagePlacement = .trailing
        configuration.imagePadding = 6
        configuration.titleAlignment = .leading
        configuration.titlePadding = 10
        configuration.subtitle = "Subtitle"
      default:
        fatalError("Implement")
      }
      return configuration
    })      
  return all
}